Circuit for providing a voltage ramp signal

Details Circuit for providing a voltage ramp signal Circuit for providing a voltage ramp signal

1994-03-14

1996-03-26

Heyman, John S.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Generating sawtooth or triangular output

327131, 327 94, 327103, H03K 406

Patent

active

055024106

ABSTRACT:
A circuit (10) for generating a voltage ramp signal (V.sub.RAMP) having minimum amplitude variation over a large frequency range has been provided. The circuit includes a comparator (40) for comparing a voltage across a ramp capacitor (32) with a reference voltage. From the result of this comparison, a sampling capacitor (16) is discharged during the time that the voltage ramp signal is less than the reference voltage and charged during the time that the voltage ramp signal is greater than the reference voltage. The resulting voltage across the sampling capacitor is held and fed back to a transconductance amplifier (20) which adjusts the current that charges the ramp capacitor thereby adjusting the peak amplitude of the voltage ramp signal.

REFERENCES:
patent: 4284906 (1981-08-01), Manfredi
patent: 4945292 (1990-07-01), Ackerson et al.
patent: 5196741 (1993-03-01), Rustici
patent: 5394020 (1995-02-01), Nienaber

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