Amplitude control for sawtooth wave form

Details Amplitude control for sawtooth wave form Amplitude control for sawtooth wave form

H - Electricity

03

K

328/108

H03K 4/08 (2006.01) H03K 4/56 (2006.01)

Patent

CA 1037132

ABSTRACT A sawtooth wave form generating circuit in which the amplitude of the sawtooth wave form is automatically maintained at a constant value by passing the same through a variable gain amplifier, measuring the amplitude of the sawtooth wave form at the moment when it reaches its maximum value, comparing such amplitude with that of a standard voltage and adjusting the gain of the amplifier accordingly. This is done through the use of a capacitor which is charged upon the occurrence of the same pulse which discharges the capacitor of the sawtooth wave generator. The capacitor controlling the gain of the amplifier is charged under the control of a comparator amplifier having one input from the output of the variable gain amplifier and the other from a source of standard voltage. The sawtooth wave generator is particularly applicable for use in measuring phase differences between two events recurring at a variable repetition rate such as encountered in automobile ignition diagnosis.

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