Readout system

摘要

A readout system includes a sensing module to generate first and second voltage signals with a phase difference associated with an environmental parameter, and a readout module configured to calibrate the phase difference, and to convert the calibrated phase difference into an output code.

主权项

1. A readout system for generating an output code associated with an environmental parameter, said readout system comprising:
a sensing module disposed to receive an input voltage signal and configured to sense the environmental parameter, and to generate, according to the input voltage signal and the environmental parameter, a first voltage signal and a second voltage signal that have a phase difference therebetween; and a readout module including:
a first delay-locked loop coupled to said sensing module for receiving the first and second voltage signals therefrom, and configured to output a lagged one of the first and second voltage signals to serve as a third voltage signal, and to delay the other one of the first and second voltage signals by a calibration period associated with a predetermined value of the environmental parameter to output a fourth voltage signal; and a readout circuit disposed to receive the input voltage signal, coupled to said first delay-locked loop for receiving the third and fourth voltage signals therefrom, and configured to convert a phase difference between the third and fourth voltage signals, according to the input voltage signal, into the output code when said readout module operates in a normal operation mode.