Digitally synthesized audio frequency voltage source

Details Digitally synthesized audio frequency voltage source Digitally synthesized audio frequency voltage source

1989-09-28

1991-08-13

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307271, 307227, 328 14, 328 27, 328186, H03K 500, H03B 1900

Patent

active

050398725

ABSTRACT:
A method and apparatus for accurately generating a digitally synthesized sinusoidal voltage is started by storing digital values for sine waveforms in a read only memory. A first and second digital to analog converters are connected to the read only memory through latches. The outputs of the first and second digital to analog converters are alternatively switched between the inverting input and the non-inverting input of an operational amplifier such that one of the first and second digital to analog converter is connected to the inverting input while the other is connected to the non-inverting input. The output of the operational amplifier is connected to the inverting input through a variable capacitance, the feedback being determined by the one of the first and second digital to analog converter connected to the inverting input. A clock is used to control the connection of the first and second digital to analog converter to the inverting input and to control the determination of the feedback.

REFERENCES:
patent: 3772681 (1973-11-01), Skingle
patent: 3845395 (1974-10-01), Murphree
patent: 4039806 (1977-08-01), Fredriksson et al.
patent: 4306190 (1981-12-01), Beckwith et al.
patent: 4814637 (1989-03-01), Roessler et al.
N. M. Oldham & P. S. Hetrick, "A Calculable, Transportable Audio-Frequency C Reference Standard", IEEE Conf., 6/88.

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