Common mode sampling mechanism for residue amplifier in switched current pipeline analog-to-digital converters
A switched current pipeline analog-to-digital converter (ADC) integrated circuit. The integrated circuit comprises a track and hold circuit (T/H) and a residue amplifier. The T/H is configured to generate a differential output of the T/H based on an analog input. The residue amplifier is coupled to the T/H, configured to capture a sample of a common mode signal of the differential output of the T/H during a periodic pulse interval, wherein the pulse interval is less than half of the time duration of the period of the pulse, configured to generate a corrected input common mode feedback signal based in part on the sample of the common mode signal of the differential output of the T/H, and configured to generate a differential output of the residue amplifier based on the differential output of the T/H and based on the corrected input common mode feedback signal.
TEXAS INSTRUMENTS INCORPORATED
H H H H H H H H H H
H03F H03M H03M H03M H03F H03F H03F H03M H03F H03F
additional additional inventional additional additional inventional additional inventional inventional additional
Shigenobu Xiaopeng Jesse Manar
Kimura Li Coulon El-Chammas