Title :
Digital offset compensation of time-interleaved ADC using random chopper sampling
Author :
Eklund, Jan-Erik ; Gustafsson, Fredrik
Author_Institution :
Ericsson Components AB, Stockholm, Sweden
Abstract :
An ADC using several parallel cells suffers from offset differences between the cells, which causes non-harmonic distortion. A method for removing the offset in the digital domain is proposed. The method is based on a PRBS-controlled chopper at the ADC input, which transforms any input signal to noise. The randomization controls the batch size required for removing the offset by a mean value calculation. The measured results are SFDR=72 dB and SNDR=59.0 dB at 22 MS/s, an improvement of 19 dB and 10 dB respectively
Keywords :
analogue-digital conversion; choppers (circuits); circuit noise; error compensation; parallel processing; PRBS-controlled chopper; digital offset compensation; mean value calculation; nonharmonic distortion; parallel cells; random chopper sampling; time-interleaved ADC; Bandwidth; Calibration; Choppers; Circuit noise; Clocks; Frequency domain analysis; Power capacitors; Random sequences; Sampling methods; Size control;
Conference_Titel :
Circuits and Systems, 2000. Proceedings. ISCAS 2000 Geneva. The 2000 IEEE International Symposium on
Conference_Location :
Geneva
Print_ISBN :
0-7803-5482-6
DOI :
10.1109/ISCAS.2000.856093
