Clock generator circuit stabilized over temperature, process...

Details Clock generator circuit stabilized over temperature, process... Clock generator circuit stabilized over temperature, process...

2006-07-11

2006-07-11

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Clock or pulse waveform generating

C327S513000

Reexamination Certificate

active

07075353

ABSTRACT:
A clock generator circuit incorporates a sub-PTAT (proportional to absolute temperature) current source and a super-PTAT current source for generating bias currents for a voltage reference generator and charging currents for a voltage ramp generator. The clock generator circuit further includes a linear comparator coupled to receive one or more switching voltage reference signals and a voltage ramp signal and generate a switching output signal as the clock signal. The clock signal is coupled to a clock decoder to generate the desired clock signals having the desired phase. The functional blocks of the clock generator circuit of the present invention operate together to generate a highly frequency stable clock signal. In one embodiment, the linear comparator incorporates a dual-differential-input (dual-channel) instrumentation amplifier as the comparator input stage to generate clock signals having clock frequency errors that are minimized over process, temperature and power supply variations.

REFERENCES:
patent: 4594565 (1986-06-01), Barreras
patent: 4792914 (1988-12-01), Dartois et al.
patent: 5828245 (1998-10-01), Brambilla et al.

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