Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Generating sawtooth or triangular output
Patent
1999-01-14
2000-08-29
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Generating sawtooth or triangular output
327131, 327134, H03K 406
Patent
active
061114405
ABSTRACT:
A circuit having multiple channels for generating multiple ramped voltage signals (preferably of a type useful in an interleaved PWM dc/dc converter) such that each ramped voltage signal has a different phase, and all the ramped voltage signals have a uniform controlled maximum amplitude. The circuit can be implemented as an integrated circuit (or portion of an integrated circuit) which generates the multiple ramped voltage signals with uniform maximum amplitude in a manner independent of process and temperature variations in implementing and operating such integrated circuit. In preferred embodiments, the circuit includes a single amplifier having an input coupled to receive a reference signal (indicative of a preselected maximum ramped voltage amplitude) and an output which is coupled (in time-division-multiplexed fashion) to each of the ramped voltage generation channels, thus implementing time-division-multiplexed negative feedback loops which control the maximum amplitude of the ramped voltage signal generated by each channel. The input offset voltage error of the amplifier is applied across all channels equally. Preferably, the ramped voltage signal generating circuit also includes circuitry for generating clock signals for controlling generation of the ramped voltage signals. Another aspect of the invention is a method for generating multiple ramped voltage signals (preferably those of a type useful in an interleaved PWM dc/dc converter) such that each ramped signal has a different phase and a uniform, controlled maximum amplitude.
REFERENCES:
patent: 3631352 (1971-12-01), Kelley
patent: 3657558 (1972-04-01), Patrickson
patent: 3866131 (1975-02-01), Figueroa
patent: 5253155 (1993-10-01), Yamamoto
patent: 5513094 (1996-04-01), Stanley
patent: 5640315 (1997-06-01), Hirano et al.
Falvey Christopher
Farrenkopf Douglas Robert
Rajagopalan Jayendar
Dinh Paul
National Semiconductor Corporation
Tran Toan
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