Variable frequency sinusoidal signal generator, in particular fo

Details Variable frequency sinusoidal signal generator, in particular fo Variable frequency sinusoidal signal generator, in particular fo

1987-05-27

1988-04-26

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

328 14, 333173, 364721, 375 65, H03B 1914

Patent

active

047409959

ABSTRACT:
A sinusoidal signal generator having a frequency variable as a function of a selection signal applied to the generator. A clock generator (1, 2) is programmable as a function of the selection signal and adapted to provide a plurality of clock signals having variable frequencies. A D/A converter (7) generates from a difference fixed potential (V.sub.ss, V.sub.r), as a function of the clock signals utilized as sampling signals, a step signal having a sinusoidal envelope, of which the fundamental frequency is a function of the selection signal. A low pass filter (10) having transfer function which is dependent on the change in the fundamental frequency of the sinusoidal envelope (as controlled by the clock signals) rejects the harmonics contained in the step signal produced by the convertor (17), and provides a sinusoidal signal having a low harmnonic distortion.

REFERENCES:
patent: 3668562 (1972-06-01), Fritkin
patent: 3740669 (1973-06-01), Nahay
patent: 3792360 (1974-02-01), Carlow
patent: 4171466 (1979-10-01), Carbrey
patent: 4328554 (1982-05-01), Mantione
patent: 4368432 (1983-01-01), Levy
patent: 4486846 (1984-12-01), McCallister
Elektronik, vol. 30, No. 16, Aug. 1981, pp. 64-66, Munich, De; M. Arnoldt

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