Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1982-07-22
1985-06-18
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307529, 377 42, 328142, H03B 1900, H03K 1302
Patent
active
045243263
ABSTRACT:
An electrical circuit and method for multiplying an analog input signal by a sinusoidal function having an instantaneous phase specified by a number signaled in binary format. As a sine wave generator, the binary number is supplied by a counter clocked at a multiple of the desired sine wave frequency. The most significant bit of the counter modulates the polarity of or actually constitutes the analog input signal which is then fed to a numerically-controlled attenuator driven by the less significant binary counter outputs. The attenuator has selectively switched resistors with values specifying a sine table of attenuation from 0 to 90 degrees. A particular resistor is selected by an analog multiplexer having paired complementary outputs so that over the range of less significant bit values, a full 180 degrees of the sinusoid is generated. As a sine wave modulator, the polarity of the analog input signal is modulated in a balanced modulator by the most significant bit of the counter, and the balanced modulator output is used as the input to the attenuator.
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AMCA International Corp.
Heyman John S.
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