INDUSTRY COMPONENT

Feedback Resistor

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

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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
  • Tolerance ±0.1% to ±1%
  • Power Rating 0.1 W to 0.5 W
  • Voltage Rating 200 V to 500 V
  • Resistance Range 100 Ω to 10 MΩ
  • Parasitic Capacitance <0.5 pF
  • Temperature Coefficient ±5 ppm/°C to ±25 ppm/°C
Standards
IEC 60115, MIL-PRF-55342

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Feedback Resistor.

feedback resistor transimpedance amplifier TIA precision resistor photodiode current-to-voltage conversion electronic components Feedback Resistor in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Transimpedance Amplifier

An amplifier that converts current to voltage, commonly used in optical and sensor receiver circuits.

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Operational Amplifier Circuit

An electronic circuit that uses operational amplifiers to amplify, filter, or condition analog signals.

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Transimpedance Amplifier Stage

An electronic circuit stage that converts a current signal into a proportional voltage signal.

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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

Interchangeable Parts

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

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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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