Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Generating sawtooth or triangular output
Patent
1992-12-30
1995-02-28
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Generating sawtooth or triangular output
327 35, 327 58, 327 74, 327131, 327132, 327134, 327137, 327146, 327181, H03K 406
Patent
active
053940202
ABSTRACT:
A vertical ramp generator includes a voltage controllable charge current source and a switched discharge current source coupled across a ramp capacitor. A pair of comparators coupled to first and second reference potentials are supplied with the ramp capacitor voltage and drive a flip/flop, the output of which operates the discharge current source. A sync signal voltage is injected into the output of one of the comparators. Another comparator compares the ramp capacitor voltage with a third reference potential corresponding to the midpoint of the desired ramp voltage to control the switching of a pair of current sources that supply a square wave current to a correction capacitor which develops a DC correction voltage. The duty cycle of the square wave current is a function of the deviation of the ramp capacitor voltage from the third reference potential. The correction voltage controls the amount of current supplied by the charge current source. An override circuit responds to a predetermined voltage across the ramp capacitor to switch another current source that increases the current to the correction capacitor to increase the DC correction voltage and reduce the current supplied to the ramp capacitor by the charge current source.
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Callahan Timothy P.
Cunningham Terry D.
Zenith Electronics Corporation
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