Transimpedance amplifier circuit with feedback-coupled voltage amplifier

摘要

The transimpedance amplifier circuit has an inverting operational amplifier (1) with an input (2) coupled to a current source (16), that an be an optical fibre coupled to a photodiode, Diodes (4, 5) are coupled to the between the input and output with the cathodes connected to an npn transistor (6). A differencing operational amplifier (13) forms the output stage and has inputs coupled t a pair of npn transistors (8, 9). The differencing amplifier output connects with a low pass circuit (14, 15) to control the transistor (6).