Precision low jitter oscillator circuit
AssigneeGennum Corporation
InventorsWei Yang, Frederick Edward Sykes
Life of this patent
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Abstract
A precision, low jitter oscillator circuit is provided that is particularly well-suited for generating a clock signal in miniature digital systems, such as digital hearing aids. The oscillator includes a plurality of differential inverters configured in a feedback loop to generate an oscillating clock signal. The differential inverters include a capacitive trimming network for adjusting the frequency of the oscillating clock signal and employ resistive loads for minimizing jitter in the clock signal. The components of the oscillator are fabricated in a common silicon process to minimize the size of the oscillator.
Claims23
A digital hearing aid system, comprising:
- at least one microphone for receiving a sound signal;
- an analog to digital (AID) converter for converting the sound signal into a digital sound signal;
- a digital sound processor for processing the digital sound signal;
- a digital to analog (D/A) converter for converting the processed digital sound signal into an analog sound signal;
- a speaker for transmitting the analog sound signal;
- and
- a precision low jitter oscillator circuit for generating an adjustable clock signal that is coupled to the A/D converter, the D/A converter, and the digital sound processor, wherein the precision low jitter oscillator circuit includes a plurality of differential inverters configured in a feedback loop, each differential inverter including a capacitive trimming network for adjusting the clock signal and a resistive load for minimizing jitter.
Dependencies are inferred from the claim text.