PA Level IV Transimpedance Amplifier OPA350 TIA Weak Current Measure 1M Signal Bandwidth Current 

Important indicator points:

1. The feedback resistance of the transimpedance amplifier is 1M variable resistance, 10M fixed resistance, 1G fixed resistance (switchable)

2. The maximum supported bandwidth is 1MHz (1M feedback loop uA gear);

3. The minimum sensitivity is 1pA;

4. Power supply voltage: +5V;

I. Overview

TIA transimpedance weak current measurement module; IV conversion preamplifier, pA-nA-mA for silicon photodetection;

Ultra-high-precision current measurement module, range: 10pA to 2mA (limit parameter); suitable for rapid development of personal projects; principle verification; all measured by 6.5-digit instruments, Tektronix multimeter (DMM4050), Keithley digital source meter ( 2363A).

Using a typical transimpedance IV circuit connection, the current measurement with the highest accuracy in principle under the current technical level can be achieved.

The bias current of the main chip is as low as 1pA, and the rail-to-rail op amp is extremely accurate. Only positive voltages are required for the input voltage (negative voltages are not required).

"Positive and negative current input" version: meaning that the input current can be positive or negative. Otherwise, only according to the specified current input direction.

Although the principle of analog circuits is very simple, it is difficult to make them without problems.

This circuit has been improved many times, and the actual measurement is available and the performance is excellent.

The calculation formula of output voltage Vout and input current I is: Vout=VCC/2±I*R;