Circuit for calibrating chopper switching mismatches in time-nested analog-to-digital converters
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- XILINX INC
- Filing Date
- 2020-02-21
- Publication Date
- 2026-06-03
AI Technical Summary
Time-skew mismatches, gain mismatches, frequency offsets, and phase offsets between the individual channels of a time-interleaved ADC circuits adversely affect performance, leading to noise and interference in analog-to-digital conversion.
A time-interleaved ADC circuit with gain and time-skew calibration circuits, utilizing pseudorandom bit sequences to scramble and de-scramble input signals, and parallel offset calibration circuits to remove offsets associated with different types of switches, ensuring accurate conversion across the entire frequency spectrum.
The solution effectively compensates for gain, switching offsets, and time skews, removing flicker noise and interference without signal degradation, allowing for accurate conversion of input signals at any frequency, including multiples of the sampling frequency.