Ramp voltage wave generating circuits

Claim 1

A ramp voltage wave generating circuit comprising a Miller''s integrater including an amplifier, a capacitor connected in parallel with said amplifier, and a resistor having one terminal connected to the input side of said amplifier; a source of constant current connected to the other terminal of said resistor; means for maintaining at a constant value the reference potential at the output terminal of said integrator in the absence of an input signal and for providing a ramp voltage at the output terminal of said integrator in the presence of said input signal; said means including a three terminal switching element with a terminal connected to said output terminal and to the source of said input signal, with another terminal connected to said constant current source and with the remaining terminal connected to a source of reference potential , said switching element being responsive to the absence of an input signal to pass a constant current from said constant current source, through said switching element to said input signal source to provide a constant voltage at said output terminal, said switching transistor being responsive to an input signal to cause a current to flow to said capacitor to produce a ramp voltage.