Transimpedance Amplifier for Detecting Signal from PIN Diode Coupled to Light Transmitting Fiber
Original Publication Date: 1984-Apr-01
Included in the Prior Art Database: 2005-Feb-06
A PIN diode is arranged to detect light from a fiber, and its electrical signal is transmitted to a transimpedance amplifier. The output of the transimpedance amplifier is applied to the non-inverting input of a first differential amplifier which produces true and complement outputs. These outputs are amplified for use in other components. The true and complement outputs are also applied to components that control the operation of the first differential amplifier. Two positive peak detector circuits are connected to the two outputs and their outputs are applied to a second differential amplifier. The output of the second differential amplifier varies with any unbalance in the two outputs with respect to ground, and is filtered and applied to the inverting input of the first differential amplifier.