Patent ID: 8183903
Filing Date: 2012-05-22
Classification: H03M

Abstract:
1. An interpolation circuit for comparing an input voltage signal with an interpolated reference signal derived from a first reference voltage signal and a second reference voltage signal, the interpolation circuit comprising: a transconductive circuit configured to generate a first differential current signal proportional to a difference between the first reference voltage signal and the input voltage signal and a second differential current signal proportional to a difference between the second reference voltage signal and the input voltage signal; a transinductive circuit configured to generate an output voltage signal having a first polarity if a value of the input voltage signal is greater than a value of the interpolated reference signal and a second polarity if the value of the input signal is less than the value of the interpolated reference signal; wherein the interpolation circuit is configured to generate a third differential current signal using a first component current signal from the first differential current signal and a second component current signal from the second differential current signal; and wherein the interpolated reference signal comprises an average of the first reference voltage signal and the second reference voltage signal.