Ultra low power servo-controlled single clock ramp generator...

Details Ultra low power servo-controlled single clock ramp generator... Ultra low power servo-controlled single clock ramp generator...

2008-04-04

2010-06-29

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Generating sawtooth or triangular output

C327S132000, C327S133000, C327S134000, C327S135000, C327S136000, C327S137000, C327S138000, C327S139000, C327S140000

Reexamination Certificate

active

07746129

ABSTRACT:
A low power servo-controlled single clock ramp generator (100) includes a fast switched comparator (102), charge pump (110) and voltage-to-current converter (120) connected to provide a feedback control mechanism under control of a pulse comparison clock signal (pulse_comp) and a reset pulse clock signal (rst_pulse) that are generated from a single input clock signal (clkin) so that there are well defined time intervals between pulses in the pulse comparison clock signal and the reset pulse clock signal, thereby providing a ramp signal (Vramp_out) having a stable, frequency-independent amplitude that is not limited by the reference voltage.

REFERENCES:
patent: 4225825 (1980-09-01), Watts
patent: 5283515 (1994-02-01), Jordan
patent: 5502410 (1996-03-01), Dunn et al.
patent: 6169433 (2001-01-01), Farrenkopf
B. Provost et al., Auto-Calibrating Analog Timer for On-Chip Testing, ITC International Test Conference, 1999.
F. Azais et al., A Low-Cost Adaptive Ramp Generator for Analog BIST Applications, 19th IEEE Proceedings on VSLI Test Symposium, 2001.

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