High bandwidth feed-forward oscillator

Details High bandwidth feed-forward oscillator High bandwidth feed-forward oscillator

2005-08-16

2005-08-16

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Generating sawtooth or triangular output

C327S140000, C327S172000, C363S041000

Reexamination Certificate

active

06930520

ABSTRACT:
A high bandwidth, feed-forward oscillator generates a ramp or sawtooth voltage for controlling the operation of a pulse width modulator-based, switched DC power supply circuit. The oscillator is operative to effectively immediately adjust the slope of each rising and falling portion of the ramp/sawtooth signal, as necessary, in proportion to the magnitude of the input voltage, while maintaining the frequency of the ramp waveform effectively constant. A comparator network establishes a difference between peak and valley portions of the sawtooth in accordance with input voltage. In response to a change in input voltage a control circuit modifies the value of the difference between the peak and valley portions to define a new set of respective peak and valley portions VpeakNEWand VvalleyNEW, and immediately causes the sawtooth waveform to transition to the new set of respective peak and valley portions VpeakNEWand VvalleyNEWat said prescribed frequency.

REFERENCES:
patent: 5250879 (1993-10-01), Koblitz
patent: 6819154 (2004-11-01), Greenfeld

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