Direct current (dc) offset correction using analog-to-digital conversion
Номер патента: EP2332302A1
Опубликовано: 15-06-2011
Автор(ы): Bahman Ahrari, Hee Choul Lee, Jin-Su Ko, Sang-Oh Lee
Принадлежит: Qualcomm Inc
Опубликовано: 15-06-2011
Автор(ы): Bahman Ahrari, Hee Choul Lee, Jin-Su Ko, Sang-Oh Lee
Принадлежит: Qualcomm Inc
Реферат: Techniques for reducing or eliminating DC (direct current) offset in transmitters are disclosed. An apparatus for DC offset reduction may include a converter, a digital engine, and a plurality of programmable current supplies. The converter is configured to provide digital representations of a plurality of DC currents associated, respectively, with a plurality of differential signal legs. The digital engine is configured to receive the digital representations and to produce instructions for generating compensating currents for the plurality of differential signal legs based on comparisons, respectively, between each of the digital representations and a calibration current. The programmable current supplies correspond, respectively, to the differential signal legs. The current supplies are configured to inject the compensating currents into the differential signal legs, respectively, to reduce DC offset between the differential signal legs, based upon the instructions. The instructions allow one-shot DC offset correction, instead of successive approximation for DC offset correction.
Direct current (dc) offset correction using analog-to-digital conversion
Номер патента: US20100026383A1. Автор: Sang Oh Lee,Jin-Su Ko,Bahman Ahrari,Hee Choul Lee. Владелец: Qualcomm Inc. Дата публикации: 2010-02-04.