AD converter

摘要

An AD converter includes a delta-sigma AD converter configured to receive an analog signal through an input terminal and obtain a higher-order bit conversion result, a first cyclic AD converter configured to receive a residual signal resulting from removal of a higher-order bit or bits, and performs a conversion process having a amplification factor of one to obtain a 1.5-bit conversion result, a second cyclic AD converter configured to perform a conversion process having an amplification factor of two to obtain a lower-order bit conversion result, and a shift register and a digital accumulator circuit that are configured to receive a higher-order bit, a 1.5-bit, and a lower-order bit conversion result and output an AD conversion value.

主权项

1. An AD converter comprising:
a first AD converter including an analog accumulator circuit, an AD converter, and a DA converter, and configured to receive an analog signal and obtain a first conversion result having a higher-order bit or bits; a second AD converter including an analog accumulator circuit, an AD converter, and a DA converter, and configured to receive a residual signal resulting from removal of the higher-order bit or bits, and perform a first conversion process and a second conversion process to obtain a second conversion result having a lower-order bit or bit; and a calculation unit configured to calculate and output an AD conversion value of the analog signal based on the first and second conversion results,wherein
the analog accumulator circuit in the first conversion process and the analog accumulator circuit in the second conversion process use different gains.