Dual-Channel Colorimeter with Programmable Gain Trans impedance Amplifiers and Digital Synchronous Detection

Circuit is a dual-channel colorimeter featuring a modulated light source transmitter, programmable gain trans impedance amplifiers on each channel and a very low noise, 24-bit analog-to-digital converter (ADC). The output of the ADC connects to a standard FPGA mezzanine card. The FPGA takes the sampled data from the ADC and implements a synchronous detection algorithm