Noise shaping successive approximation register analog-to-digital converter

摘要

An analog-to-digital converter includes: a first input terminal to receive a first input signal; a second input terminal to receive a second input signal; a noise shaping module configured to compare the first input signal to the second input signal received, and to output a digital output signal and a residue signal in a first phase of a noise shaping operation; and a storage module configured to store the residue signal during the first phase of the noise shaping operation, the storage module configured to receive an analog input signal and remove the residue signal from the analog input signal in a second phase of the noise shaping operation to output a new first input signal to the noise shaping module.

主权项

1. An analog-to-digital converter (ADC), comprising:
a first input terminal to receive a first input signal; a second input terminal to receive a second input signal; a noise shaping module configured to compare the first input signal to the second input signal received, and to output a digital output signal and a residue signal in a first phase of a noise shaping operation; a storage module comprising a first residue capacitor having first and second nodes and a first buffer coupled to the first input terminal, the storage module configured to store the residue signal during the first phase of the noise shaping operation, the storage module configured to receive an analog input signal and remove the residue signal from the analog input signal in a second phase of the noise shaping operation to output a new first input signal to the noise shaping module, a first switch coupled to the first buffer and the first node of the first residue capacitor, the first switch during the first phase of the noise shaping operation; and a second switch coupled to the first input terminal and the second node of the first residue capacitor, the second switch configured to place the first residue capacitor in series with the analog input signal in the second phase of the noise shaping operation.