FAST ON-CHIP OSCILLATOR TRIMMING

摘要

Oscillation frequency measurements for trimming oscillators on an integrated circuit device are performed entirely on the device. The oscillation frequency measurements utilize a reference clock. Some measurements count periods of the oscillator signal independently of the reference clock, and some measurements count periods of the reference clock independently of the oscillator signal. After one oscillator on the device has been trimmed, that trimmed oscillator may then be used to make oscillation frequency measurements for trimming another oscillator on the device.

主权项

1. An integrated circuit, comprising:
an oscillator trim register configured to hold oscillator trim values; an oscillator coupled to said oscillator trim register and configured to produce an oscillator signal at an oscillation frequency that depends on the oscillator trim value held in said oscillator trim register; and logic coupled to said oscillator and configured to use a reference clock of known frequency to measure the oscillation frequencies respectively corresponding to said oscillator trim values, said logic further configured to count periods of one of said oscillator signal and said reference clock independently of the other of said oscillator signal and said reference clock.