Precision Switched Integrator Transimpedance Amplifier

Module is  based on IVC102 chip from Texas Instruments. This chip is a precision integrating amplifier with FET OPAMP, integrating capacitors, and low leakage FET switches. It integrates low-level input current for a user-determined period, storing the resulting voltage on the integrating capacitor. The output voltage can be held for accurate measurement. The IVC102 provides a precision, lower-noise alternative to conventional transimpedance OPAMP circuits that require a very high-value feedback resistor. The project is ideal for amplifying low-level sensor currents from photodiodes and ionization chambers. The input signal current can be positive or negative. TTL/CMOS-compatible timing inputs control the integration period, hold, and reset functions to set the effective transimpedance gain and reset (discharge) the integrator capacitor. Jumpers are provided to configure the circuit for photodiode amplifier or ionization chamber measurement.

Features

• Power Supply +/-15V Dc
• On-Chip Integrating Capacitors
• Switch Signal TTL 5V
• Gain Programmed By Timing
• Low Input Bias Current: 750fA Max
• Low Noise
• Low Switch Charge Injection
• Fast Pulse Integration
• Low Nonlinearity: 0.005% Type
• PCB Dimensions 28.73 x 20.96 mm
• 2 x 2.5mm Mounting Holes

Applications

• Precision Low Current Measurement
• Photodiode Measurements
• Ionization Chamber Measurements
• Current/Charge-Output Sensors
• Leakage Current Measurement