Patent ID: 6262624
Filing Date: 2001-07-17
Classification: H03J,H03L

Abstract:
A filter compensation circuit comprising:a sine wave generator, the sine wave generator generating a sine wave;a filter coupled to the sine wave generator and delaying a phase of the sine wave;a filter sine to square wave converter coupled to the filter and converting the delayed sine wave into a filter square wave signal;a reference sine to square wave converter coupled to the sine wave generator and converting the sine wave into a reference square wave signal;a comparator coupled to the filter sine to square wave converter and to the reference sine to square wave converter, the comparator comparing a phase relationship between the filter square wave signal and the reference square wave filter; anda correction signal generator coupled to the comparator, the correction signal generator generating a correction signal based on the comparison of the phase relationship, the correction signal being fed back to the filter to adjust a transconductance of the filter.