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High-gain voltage amplifier with a differential input
An operational amplifier (often op amp, op-amp, or opamp) is a DC-coupled electronic amplifier with a differential input, a (usually) single-ended output
Operational_amplifier
Operational amplifiers have several applications, optimised for use with negative feedback. When positive feedback is required, a comparator is usually
Operational amplifier applications
Operational_amplifier_applications
Electrical circuit
The operational transconductance amplifier (OTA) is an amplifier that outputs a current proportional to its input voltage. Thus, it is a voltage controlled
Operational transconductance amplifier
Operational_transconductance_amplifier
Operational amplifier
The μA741 is an early operational amplifier (op amp) integrated circuit (IC), originally designed at Fairchild Semiconductor by Dave Fullagar and released
ΜA741
Type of electronic amplifier
The current-feedback operational amplifier (CFOA or CFA) is a type of electronic amplifier whose inverting input is sensitive to current, rather than
Current-feedback operational amplifier
Current-feedback_operational_amplifier
Electronic device/component that increases the strength of a signal
An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the magnitude of a signal (a time-varying voltage or
Amplifier
Amplifier that converts current to voltage
transimpedance amplifier (TIA) is a current to voltage converter, almost exclusively implemented with one or more operational amplifiers (opamps). The
Transimpedance_amplifier
Control concept
due to temperature change. In analog computing, feedback around operational amplifiers is used to generate mathematical functions such as addition, subtraction
Negative_feedback
Electrical circuit component which amplifies the difference of two analog signals
A differential amplifier is a type of electronic amplifier that amplifies the difference between two input voltages but suppresses any voltage common
Differential_amplifier
Precision differential amplifier with input buffering
schematically identical to a standard operational amplifier (op-amp), the electronic instrumentation amplifier is almost always internally composed of
Instrumentation_amplifier
Electrical characteristic
amplifier Transimpedance amplifier Fontana bridge Operational transconductance amplifier MOSFET Blencowe, Merlin (2009). "Designing Tube Amplifiers for
Transconductance
Circuit component performing mathematical integration
The operational amplifier integrator is an electronic integration circuit. Based on the operational amplifier (op-amp), it performs the mathematical operation
Op_amp_integrator
Gain in an electric amplifier
electronic amplifiers is exceedingly high (by design) – an ideal operational amplifier (op-amp) has infinite open-loop gain. Typically an op-amp may have
Open-loop_gain
Type of electronic amplifier
A valve amplifier or tube amplifier is a type of electronic amplifier that uses vacuum tubes to increase the amplitude or power of a signal. Low to medium
Valve_amplifier
Circuit that makes capacitor act like a larger capacitor
ways. An active circuit, using a device such as a transistor or operational amplifier A passive circuit, using autotransformers. These are typically used
Capacitance_multiplier
Mapping of the physical contacts of an electronic component
In electronics, a pinout (sometimes written "pin-out") is a cross-reference between the contacts, or pins, of an electrical connector or electronic component
Pinout
Electronic filter topology
reasonable approximation to an amplifier with unity voltage gain. Modern analog filter implementations may use operational amplifiers (also called op amps). Because
Sallen–Key_topology
Operational amplifier for audio applications
operational amplifier (op amp) for audio applications introduced by Signetics in 1979. The 5532 and the contemporary TL072 were the first operational
NE5532
Type of electronic amplifier
A negative-feedback amplifier (or feedback amplifier) is an electronic amplifier that subtracts a fraction of its output from its input, so that negative
Negative-feedback_amplifier
Type of voltage sampling device
one operational amplifier. To sample the input signal, the switch connects the capacitor to the output of a buffer amplifier. The buffer amplifier charges
Sample_and_hold
Figure of merit for amplifiers
the gain at which the bandwidth is measured. For devices such as operational amplifiers that are designed to have a simple one-pole frequency response,
Gain–bandwidth_product
Electronic current integrator
capacitor. The charge amplifier was invented by Walter Kistler in 1950. Charge amplifiers are usually constructed using an operational amplifier or other high
Charge_amplifier
Measurement of an electronic circuit
output signal. In the context of analog integrated circuits, such as operational amplifiers, the PSRR is defined as the change in supply voltage required to
Power_supply_rejection_ratio
Input needed to zero an amplifier output
between the inputs of an amplifier, especially an operational amplifier (op-amp), to make the output zero (for voltage amplifiers, 0 volts with respect to
Input_offset_voltage
Electronic circuit
primarily in the input and output stages of high-speed current-feedback operational amplifiers. The circuit is also the essential building block of bipolar current
Diamond_buffer
Computation machine that uses continuously varying data technology
more operational amplifiers ("op amps"), named because they perform mathematical operations. Op amps are a particular type of feedback amplifier with
Analog_computer
Low power dual operational amplifier
The LM358 is a low-power dual operational amplifier integrated circuit, originally introduced by National Semiconductor. It uses a single power supply
LM358
Inventor of the operational amplifier
23, 1998) was the inventor of the operational amplifier (or 'opamp'). He filed the patent for the 'summing amplifier' in 1941 when working at Bell Labs
Karl_D._Swartzel_Jr.
Electrical circuit
electric current as input instead of voltage. Log amplifier circuits designed with operational amplifiers (opamps) use the exponential current–voltage relationship
Log_amplifier
Type of electronic amplifier
A programmable-gain amplifier (PGA) is an electronic amplifier (typically based on an operational amplifier) whose gain can be controlled by external
Programmable-gain_amplifier
American engineer (1913–1974)
Researches (GAP/R), for the 1953 commercialization and wide adoption of operational amplifiers, a now-ubiquitous component of analog electronic systems, and the
George_A._Philbrick
more efficient board layout. Operational amplifier (op-amps) swapping is the process of replacing an operational amplifier in audio equipment with a different
DIY_audio
compares two input voltages. Comparators are closely related to operational amplifiers, but a comparator is designed to operate with positive feedback
Comparator_applications
Amplifier design technique
engineering, frequency compensation is a technique used in amplifiers, and especially in amplifiers employing negative feedback. It usually has two primary
Frequency_compensation
Startup technique in electronics
more generally for dynamically altering the operating point of an operational amplifier (by shifting both its positive and negative supply rail) in order
Bootstrapping_(electronics)
20 September 2013. Lenk, John (28 June 1996). Simplified Design of IC Amplifiers. Newnes. p. 152. ISBN 9780080517186. Retrieved 19 September 2013. "LM10"
List of LM-series integrated circuits
List_of_LM-series_integrated_circuits
Electronic comparator circuit with hysteresis
used internally across the two inputs of the operational amplifier. In these cases, the operational amplifiers will fail to function well as comparators
Schmitt_trigger
DC-coupled high-gain electronic voltage amplifier with differential inputs and outputs
A fully differential amplifier (FDA) is a DC-coupled high-gain electronic voltage amplifier with differential inputs and outputs. In its ordinary usage
Fully_differential_amplifier
A direct-coupled amplifier or DC amplifier is a type of amplifier in which the output of one stage of the amplifier is coupled to the input of the next
Direct-coupled_amplifier
Multiple electronic amplifiers can be connected such that they drive a single floating load (bridge) or a single common load (parallel), to increase the
Bridged and paralleled amplifiers
Bridged_and_paralleled_amplifiers
American electronics engineer (1937–1991)
operational amplifier ICs (μA702, μA709), some of the earliest integrated voltage regulator ICs (LM100 and LM105), the first operational amplifiers employing
Bob_Widlar
Electrical circuit
The precision rectifier, sometimes called a super diode, is an operational amplifier (opamp) circuit configuration that behaves like an ideal diode and
Precision_rectifier
System designed to maintain a constant voltage
by using a differential amplifier, possibly implemented as an operational amplifier: In this case, the operational amplifier drives the transistor with
Voltage_regulator
Guitar overdrive pedal
In doing so, he used an innovative circuit, using the monolithic operational amplifier device, introduced in early 70s, to create a pedal sound different
Ibanez_Tube_Screamer
Parameter of electronic amplifiers
minimum. A prime example is when the amplifier's output is connected to a capacitive load. Therefore, operational amplifiers are usually compensated to achieve
Phase_margin
Ability of a circuit to increase the power or amplitude of a signal
general purpose amplifiers, especially operational amplifiers, the term usually refers to voltage gain, but in radio frequency amplifiers it usually refers
Gain_(electronics)
Transistors Operational amplifiers Regulated power supply D.C Power Amplifiers Measurement Equipment Servomechanisms Differential amplifier Error Amplifier Design
Error_amplifier_(electronics)
Device that compares two voltages or currents
the difference in characteristics of an operational amplifier and comparator, using an operational amplifier as a comparator presents several disadvantages
Comparator
Electrical circuit with negligible impedance
current. In electronics, the ideal model (infinite gain) of an operational amplifier is said to produce a virtual short circuit between its input terminals
Short_circuit
Touch-sensitive musical instrument played with the fingers
Netherlands. The kraakdoos is a simple device, based on a single operational amplifier (the LM709 one of the earliest models to be produced) and a few
Kraakdoos
Topics referred to by the same term
potentially break serve when the score is 15–30 Op-amp, short for operational amplifier Op-ed, a newspaper opinion piece Operation (disambiguation) Operator
OP
Analog circuit which filters an electronic signal using an amplifier
typically an amplifier. Amplifiers included in a filter design can be used to improve the cost, performance and predictability of a filter. An amplifier prevents
Active_filter
Change of voltage or current per unit of time
amplifier designs in how the slewing phenomenon occurs. The figure gives a simplified schematic of the first two stages of an operational amplifier (opamp)
Slew_rate
Voltage or current source dependent on another in the network
magnitude of the current fed into its controlling base terminal. An operational amplifier can be described as a voltage source dependent on the differential
Dependent_source
Type of amplifier
directions through the sense resistor. Normal differential amplifiers and operational amplifiers powered between two power supply rails (say VCC and VEE)
Current_sense_amplifier
Synthesizer that uses analog circuits
technologies. After the 1960s, analog synthesizers were built using operational amplifier (op-amp) integrated circuits, and used potentiometers (pots, or
Analog_synthesizer
Audio engineer (1942–1989)
founder of Jensen Transformers, Inc, and the inventor of the 990 Operational Amplifier. He also developed the COMTRAN circuit analysis software. Jensen
Deane_Jensen
headphone amplifier originally designed by Pow Chu Moy. The headphone amplifier is designed around single or dual-channel operational amplifiers (op-amps)
CMoy
Phenomena in electronic circuits
may be done with an operational amplifier, as shown below, or with a discrete circuit. In the example shown, the operational amplifier is used to reduce
Crossover_distortion
Type of electronic circuit
circuit. Although analog multiplier circuits are very similar to operational amplifiers, they are far more susceptible to noise and offset voltage-related
Analog_multiplier
Fixed potential node in an electric circuit
consequence. The virtual ground concept aids circuit analysis in operational amplifiers and other circuits and provides useful practical circuit effects
Virtual_ground
Circuit designed to copy a current through one active device
An explanation follows of how the circuit in Figure 3 works. The operational amplifier is fed the difference in voltages V1 − V2 at the top of the two
Current_mirror
Type of variable active electronic filter
realisation with Operational Amplifiers, using state-variable synthesis. Filters of this kind, especially the version with three Operational Amplifers are
State_variable_filter
Process where information about current status is used to influence future status
open-loop gain and the closed-loop gain is known as the loop gain "Operational amplifier gain stability, Part 2: DC gain-error analysis" (PDF). ... shows
Feedback
Topics referred to by the same term
century 741 BC, a year in the 8th century BC 741 (number) The 741 operational amplifier integrated circuit List of highways numbered 741 This disambiguation
741_(disambiguation)
Current controlled voltage source electronic circuit
of two input currents. The Norton amplifier can be regarded as the dual of the operational transconductance amplifier (OTA) which takes a differential
Norton_amplifier
Signal processing filter
into a stable filter with an equivalent magnitude response. The operational amplifier circuit shown in adjacent figure implements a single-pole active
All-pass_filter
Unpackaged integrated circuit
integrated-circuit die Two dies bonded onto one chip carrier A monolithic IC operational amplifier 3 1/2 digit single-chip A/D converter SN7400 Quad NAND gate in flat
Die_(integrated_circuit)
Electronic amplifier that varies its gain depending on a control input
optical audio compressors. Another type of circuit uses operational transconductance amplifiers. In audio applications, logarithmic gain control is used
Variable-gain_amplifier
Type of electronic circuit
common form of linear oscillator is an electronic amplifier such as a transistor or operational amplifier connected in a feedback loop with its output fed
Electronic_oscillator
Integrated circuit device
devices. For voltage mode devices, each block usually contains an operational amplifier in combination with programmable configuration of passive components
Field-programmable analog array
Field-programmable_analog_array
Electric circuit composed of resistors and capacitors
the input and feedback loop of operational amplifiers (see operational amplifier integrator and operational amplifier differentiator). The parallel RC
RC_circuit
Voltage reference used in integrated circuits
bandgap reference, the circuit uses negative feedback (by means of an operational amplifier) to force a constant current through two bipolar transistors with
Brokaw_bandgap_reference
Electronic system controlling a three electrode cell
heart of the different potentiostatic electronic circuits is an operational amplifier (op amp). It consists of an electric circuit which is usually described
Potentiostat
Type of electronic noise that occurs in semiconductors
MOSFET)" (PDF). Archived from the original (PDF) on April 14, 2006. "Operational Amplifier Noise Prediction" (PDF). Intersil Application Note. Archived from
Burst_noise
standard TTL digital logic components and linear products such as operational amplifiers, as well as a variety of memory components. In 1971, MIL became
Microsystems_International
Topics referred to by the same term
Ochratoxin A (also termed OTA), a mycotoxin Operational transconductance amplifier, a kind of operational amplifier Optical tube assembly, the tubular optical
OTA
American semiconductor company
was a pioneer in the fields of digital-to-analog converters and operational amplifiers. The company was founded in 1969 by Marv Rudin and Garth Wilson
Precision_Monolithics
Electronic filter circuitry used in loudspeakers
such as transistors and operational amplifiers. In recent years, the most commonly used active device is an operational amplifier. In contrast to passive
Audio_crossover
Electronic circuit
value (via a multiplier/squarer circuit in the feedback loop of an operational amplifier).[citation needed] A full-wave precision rectifier circuit to create
True_RMS_converter
Analog signal conditioning circuitry
signal conditioning circuitry that uses sensitive analog amplifiers, often operational amplifiers, filters, and sometimes application-specific integrated
Analog_front-end
compensation used in an electronic amplifier. When a capacitor is introduced between the input and output sides of the amplifier with the intention of moving
Pole_splitting
Device that converts a digital signal into an analog signal
each bit of the DAC connected to a summing point, typically an operational amplifier. Each input in the summing has powers-of-two weighting with the
Digital-to-analog_converter
Electronic circuit
transistors, and even vacuum tubes. An example application is the 741 operational amplifier, and Widlar used the circuit as a part in many designs. This circuit
Widlar_current_source
Semiconductor diode
super diode, consisting of a pn-diode or Schottky diode and an operational amplifier, provides an almost perfect diode characteristic due to the effect
Schottky_diode
American engineer who has been credited with inventing the first operational amplifier circuit with differential inputs (1943), a topology which allowed
Loebe_Julie
Topics referred to by the same term
from scholarly sources Operational amplifier, an electronic component Operational analysis, more generally called "operational research", a branch of
OA
Electronic circuit formed on a small, flat piece of semiconductor material
art, silicon graffiti or silicon doodling. The 555 timer IC The Operational amplifier 7400-series integrated circuits 4000-series integrated circuits
Integrated_circuit
Guitar effect pedal
in- and output buffers surrounding a transistor boost stage, an operational amplifier gain stage with hard clipping diodes, and a tone control. It features
Boss_DS-1
University. Tsividis designed and built the first integrated MOSFET operational amplifier in 1976. Tsividis is Fellow of the IEEE and received the Golden
Yannis_Tsividis
American semiconductor manufacturer
Amplifiers includes precision and operational amplifiers, instrumentation, current sense, differential amplifiers, audio amplifiers, video amplifiers/buffers/filters
Analog_Devices
Manipulation of an analog signal into a form suitable for further processing
processing stage (often carried out by an ADC and a micro-controller). Operational amplifiers (op-amps) are commonly employed to carry out the amplification of
Signal_conditioning
Metric used to determine how well a differential amplifier suppresses common-mode signals
noise. CMRR is an important feature of operational amplifiers, difference amplifiers and instrumentation amplifiers, and can be found in the datasheet. The
Common-mode_rejection_ratio
Dual operational transconductance amplifier
integrated circuit (IC) containing two current-controlled operational transconductance amplifiers (OTA), each having differential inputs and a push-pull
LM13700
Electronic filter circuits defined by component connection
is required, the output can be taken at the output of the second operational amplifier, after the order of the second integrator and the inverter has been
Electronic_filter_topology
Topics referred to by the same term
broadcasting Crossed-field amplifier, a specialized vacuum tube used as a microwave amplifier Current-feedback operational amplifier Component failure analysis
CFA
quantity being measured. This is commonly used in switched-capacitor operational amplifiers to effectively double the gain of the charge sharing opamp, while
Correlated_double_sampling
Digitally-controlled electronic component
the two end points and the (nominal) wiper are undefined. In an operational amplifier circuit, the off-state impedance of a real potentiometer can help
Digital_potentiometer
American technology company
1982; Dave Fullagar, inventor of the first internally compensated operational amplifier circuit; Roger Fuller, a pioneer in CMOS microchip design; Rich
Maxim_Integrated
Set of analog electronic circuits on a single semiconductor
examples of long-lived and well-known analog chips are the 741 operational amplifier, and the 555 timer IC. Power supply chips are also considered to
Linear_integrated_circuit
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