Feedback Amplifier for Current Sources

Product Specifications

Technical details and manufacturing context for Feedback amplifier

Definition

A feedback amplifier is a component used in current sources and sinks to regulate output current. It samples a portion of the output signal and feeds it back to the input, creating a closed-loop system that adjusts the main amplifying stage. This reduces sensitivity to component parameter variations and external conditions, enhancing precision, stability, and linearity. The amplifier compares a sample of its output current (or a proportional voltage) with a reference input; the difference (error signal) is amplified and used to correct the output, forcing it to match the desired setpoint. Typical parameters include a supply voltage of ±15 V DC, a gain-bandwidth product of 10–100 MHz, an open-loop gain of 80–120 dB, an input offset voltage of 0.1–5 mV, an input bias current of 1–100 nA, an output voltage swing of ±12–±14 V, a slew rate of 0.5–20 V/µs, an operating temperature range of -40–85 °C (per IEC 60068-2-1), an input voltage range of ±13.5 V, power dissipation of 50–500 mW, a package type of SOIC-8 (per JEDEC MS-012), and an input noise voltage density of 5–50 nV/√Hz. Materials include semiconductor (silicon or GaAs), copper, and FR-4 PCB substrate. These values are reference ranges; verify model-specific specifications with the manufacturer. The amplifier is used in precision current sources, instrumentation, and control systems. Selection requires considering supply voltage, bandwidth, offset, noise, and package. Interfaces include power supply pins, input, output, and feedback connections. Verification involves checking output accuracy, stability, and thermal performance. Maintenance signals include drift, oscillation, or excessive noise. Failure boundaries include exceeding absolute maximum ratings or operating outside the specified temperature range.

Working Principle

The feedback amplifier operates by comparing a sample of its output current (or a proportional voltage) with a reference input. The difference, or error signal, is amplified and used to adjust the main amplifying stage. This closed-loop configuration forces the output to match the desired setpoint defined by the reference. The feedback network determines the closed-loop gain and improves linearity and stability by reducing the effect of component variations and external disturbances.

Common Materials

Semiconductor (Silicon/GaAs), Copper, FR-4 (PCB Substrate)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Supply Voltage	±15 V DC	Dual supply required for full output swing
Gain Bandwidth Product	10–100 MHz	Higher for high-speed applications
Open-Loop Gain	80–120 dB	Determines accuracy of closed-loop gain
Input Offset Voltage	0.1–5 mV	Lower for precision applications
Input Bias Current	1–100 nA	Important for high-impedance sources
Output Voltage Swing	±12–±14 V	Depends on load and supply
Slew Rate	0.5–20 V/µs	Limits large-signal bandwidth
Operating Temperature Range	-40–85 °C	Extended range for industrialIEC 60068-2-1
Input Voltage Range	±13.5 V	Common-mode range
Power Dissipation	50–500 mW	Depends on supply and load
Package Type	SOIC-8	Other packages availableJEDEC MS-012
Input Noise Voltage Density	5–50 nV/√Hz	Lower for low-noise designs

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Differential Input Stage Part
Amplifies the voltage difference between the inverting and non-inverting inputs. Provides high input impedance and common-mode rejection.

Material: Semiconductor (BJT/FET)
Gain Stage
Provides the primary voltage amplification of the error signal from the input stage.

Material: Semiconductor (BJT/FET)
Output Stage
A buffer that provides current gain, low output impedance, and drives the load (which includes the feedback network).

Material: Semiconductor (BJT/MOSFET)
Feedback Network Part
A resistive (and sometimes capacitive) network that samples the output and feeds a portion back to the input, determining the closed-loop gain and stability.

Material: Thin Film Resistor, Ceramic Capacitor

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Current Sources/Sinks

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Current source cell

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Manufacturers of Feedback amplifier

Manufacturer profiles associated with Feedback amplifier.

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Frequently Asked Questions

What is the primary function of a feedback amplifier in a current source?

It regulates the output current by comparing a sample of the output with a reference and adjusting the main stage to minimize the error, ensuring accurate and stable current.

What supply voltage is required?

A dual supply of ±15 V DC is typical for full output swing, but verify the specific model's requirements.

What is the operating temperature range?

The reference range is -40 to 85 °C per IEC 60068-2-1, but confirm the actual range for your application.

How do I verify the amplifier's performance?

Check the output accuracy, stability, and noise under load. Compare measured parameters with the datasheet values and ensure operation within specified limits.

Data Basis

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Preliminary Technical Classification

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pressure:	Not applicable (electronic component)
other spec:	Supply voltage: ±5V to ±18V, Bandwidth: DC to 100MHz typical, Load impedance: 600Ω to 10kΩ
temperature:	-40°C to +85°C (operational), -55°C to +125°C (storage)

Feedback amplifier

Product Specifications

Applied To / Applications

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