Frequency doubler
AssigneeRCA Corporation
InventorsAlois Vaclav Tuma, Jorg Schiess
Life of this patent
Estimating the term…
Abstract
A biasing circuit biases the second of two input terminals of a differential amplifier at a first reference level. A sawtooth voltage of a first frequency is coupled to the first input terminal. A bilevel voltage generated at an output terminal of the differential amplifier shifts levels when the sawtooth voltage equals the first reference voltage level. A second biasing circuit coupled to the first input terminal biases the first input terminal at a second reference voltage level differing from the first reference level by an offset voltage. The second reference level is selected to equalize the duration of each of the bilevel voltages. Output signals are produced when the bilevel voltage shifts levels, thereby producing the output signals at twice the first frequency.
Claims15
A frequency doubler comprising:
- a differential amplifier including first and second input terminals and an output terminal;
- first biasing means coupled to said differential amplifier for biasing said second input terminal at a first reference voltage level;
- sawtooth means coupled to said first input terminal for providing a sawtooth voltage of a first frequency at said first input terminal for generating a first bilevel voltage at said output terminal, said first bilevel voltage shifting levels when said sawtooth voltage equals said first reference voltage level;
- second biasing means coupled to said first input terminal for biasing said first input terminal at a second reference voltage level , said second reference voltage level selected to differ from said first reference voltage level by an offset voltage sufficient to equalize the duration of each of said first bilevel voltage levels;
- and
- output signal producing means coupled to said output terminal for producing output signals when said first bilevel voltage shifts levels, thereby producing said output signals at twice said first frequency.
Dependencies are inferred from the claim text.