Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Generating sawtooth or triangular output
Patent
1995-04-25
1996-11-12
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Generating sawtooth or triangular output
327132, 327134, 327170, H03K 301, H03K 406
Patent
active
055743927
ABSTRACT:
An asymmetrical ramp generator system for a pulse width modulator includes a complementary clock circuit; a first symmetrical dual ramp generator, responsive to the clock circuit, for generating first and second ramps having a predetermined voltage range and extending for a period equal to or greater than one half the clock cycle; a comparator device, responsive to the first and second symmetrical ramps and to a reference level within the predetermined voltage range of the first and second ramps, for generating corresponding dual first and second asymmetrical drive signals; and a second asymmetrical dual ramp generator, responsive to the first and second asymmetrical drive signals, for generating third and fourth asymmetrical overlapping ramps which extend beyond the predetermined voltage range.
REFERENCES:
patent: 3810039 (1974-05-01), Fein
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patent: 4771193 (1988-09-01), Ohta
patent: 4820940 (1989-04-01), Wachi et al.
patent: 5394020 (1995-02-01), Nienaber
patent: 5438291 (1995-08-01), Carbou et al.
patent: 5502419 (1996-03-01), Kawasaki et al.
Analog Devices Inc.
Callahan Timothy P.
Nu Ton My-Trang
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