Fast filter calibration apparatus

摘要

A fast filter calibration system includes a multi clock generator, an analog filter including a variable capacitor and a fast calibration apparatus. The fast calibration apparatus further includes a phase comparator, a frequency detector and a fast calibration unit. The fast calibration unit stores a binary code corresponding to a bandwidth frequency of a filter and initiates a fast filter calibration by calibrating the filter from a binary code close to a guaranteed-by-design binary code for the bandwidth frequency to be calibrated.

主权项

1. A fast calibration apparatus comprising:
an auto calibration unit comprising:
a phase comparator configured to receive an output from a filter;a frequency detector configured to receive the output from the filter; and a fast calibration unit configured to generate a starting binary code for calibrating a bandwidth frequency of the filter based upon:
a binary code corresponding to the bandwidth frequency of the filter, wherein the binary code is a guaranteed-by-design value; anda margin number corresponding to processing and operational variations of the bandwidth frequency of the filter, wherein the fast calibration unit comprises an input coupled to the auto calibration unit and an output coupled to the filter.