INDUSTRY COMPONENT

Feedback Resistor

A precision resistor used in transimpedance amplifiers to convert photodiode current to voltage with high accuracy and stability.

Component Specifications

Definition
A feedback resistor is a critical passive electronic component in transimpedance amplifier (TIA) circuits, specifically designed to set the gain by converting input current from a photodiode or other current source into an output voltage. It determines the amplifier's transimpedance gain (V/I) and directly impacts bandwidth, noise performance, and signal integrity in optical communication, sensing, and measurement systems.
Working Principle
The feedback resistor operates by providing a path for current to flow from the output to the input of an operational amplifier in a TIA configuration. According to Ohm's Law (V = I × R), the input current from a photodiode passes through the resistor, generating a proportional voltage drop. This voltage is fed back to the inverting input, stabilizing the amplifier and enabling precise current-to-voltage conversion with minimal offset and noise.
Materials
Thin-film or metal-foil resistor materials, typically using nickel-chromium (NiCr), tantalum nitride (TaN), or silicon-chromium (SiCr) on ceramic substrates like alumina (Al2O3). Terminations are often gold-plated or tin-lead for solderability.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Tolerance±0.1% to ±1%
Power Rating0.1 W to 0.5 W
Voltage Rating200 V to 500 V
Resistance Range100 Ω to 10 MΩ
Parasitic Capacitance<0.5 pF
Temperature Coefficient±5 ppm/°C to ±25 ppm/°C

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

Standards
IEC 60115, MIL-PRF-55342

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Thermal noise (Johnson-Nyquist noise)
  • Parasitic capacitance limiting bandwidth
  • Thermal drift affecting stability
  • Solder joint failures
FMEA Triads
Trigger: High operating temperature
Failure: Resistance drift beyond specification
Mitigation: Use resistors with low temperature coefficients and adequate cooling.
Trigger: Mechanical stress during assembly
Failure: Cracked substrate leading to open circuit
Mitigation: Follow proper handling and soldering guidelines, use strain relief.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
±0.1% to ±1% per IEC 60115
Test Method
Four-wire resistance measurement, temperature cycling, and high-voltage testing

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
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Manufacturers of Feedback Resistor

Manufacturer profiles associated with Feedback Resistor.

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Frequently Asked Questions

Why is low parasitic capacitance important in a feedback resistor for TIAs?

Low parasitic capacitance minimizes phase shift and stability issues, preserving bandwidth and reducing noise in high-frequency applications like optical receivers.

How does resistor tolerance affect TIA performance?

Tolerance directly impacts gain accuracy; tighter tolerances (e.g., ±0.1%) ensure precise signal conversion, critical in measurement and communication systems.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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