Method and circuit for producing sinusoidal waves having harmoni

Details Method and circuit for producing sinusoidal waves having harmoni Method and circuit for producing sinusoidal waves having harmoni

1985-02-11

1987-05-12

LaRoche, Eugene R.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

307261, 328 14, 328 21, 328 27, H03K 710, H03K 500, H03B 2800

Patent

active

046653724

ABSTRACT:
A method for producing sinusoidal waves uses the steps of generating a plurality of clock signals during a 2.pi. period, using the clock signals to control the generation of 2.pi. periodical square wave pulses having preselected length and phase relationships during respective ones of the clock signals and applying the square wave pulses to a low pass filter. The reduction of pulse length as well as the phase relationship of the pulses is evaluated from a system of equations by setting the odd harmonics of corresponding Fourier series to zero or to a predetermined minimum value. A circuit device utilizing this method uses a switching amplifier operated in a binary sequence having a period corresponding to the desired sine wave period and a low pass filter connected to the output of the amplifier. A clock oscillator having a clock frequency higher than the frequency of the desired sine wave controls the amplifier via a sequencer having a counter stepped by the oscillator with the counter outputs being applied to the switching amplifier through a logic circuit.

REFERENCES:
patent: 3100851 (1963-08-01), Ross et al.
patent: 3215860 (1965-11-01), Neumann
patent: 3544906 (1968-12-01), Dulaney et al.
patent: 3660766 (1972-05-01), Hilliard, Jr.
patent: 3838414 (1974-09-01), Wiles
patent: 4061909 (1977-12-01), Bryant

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