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US 4,071,776 AGranted
Sawtooth voltage generator for constant amplitude sawtooth waveform from varying frequency control signal
AssigneeRCA Corporation
InventorRobert Haynes Isham, II
Life of this patent
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Abstract
A generator of recurrent ramp voltages in response to a pulse train. It includes a circuit for ensuring that the output voltage of the generator reaches its maximum value just prior to the occurrence of the next trigger pulse despite such perturbations as a change in the frequency of the pulse train, a change in the value of the circuit supply voltage, or changes in component values.
Claims6
A circuit for producing sawtooth voltage waves having substantially constant amplitude in response to a command signal whose frequency may vary comprising, in combination:
- first and second voltage terminals across which an operating voltage may be applied;
- an amplifier having input, output and common terminals;
- first resistance means for coupling the first voltage terminal to the amplifier common terminal via a direct current conductivity path;
- second resistance means connecting the amplifier input terminal to the second voltage terminal for providing effectively the sole direct current path to or from the amplifier input terminal;
- a first energy storage element connected between the amplifier input terminal and one of the voltage terminals;
- a second energy storage element connected between the amplifier output terminal and one of the voltage terminals;
- and
- switching means having a conduction path and a control electrode, said conduction path connected in parallel with the second energy storage element, the control electrode connected to a source of command signals the frequency of which varies.
5 more elements
Dependencies are inferred from the claim text.