Circuitry for adjusting the amplitude of analog signals

Details Circuitry for adjusting the amplitude of analog signals Circuitry for adjusting the amplitude of analog signals

1988-09-07

1989-12-19

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307358, 307494, 307542, 328165, 328168, H03K 502, H03K 508, H03K 1716

Patent

active

048884960

ABSTRACT:
In an audio signal amplitude control circuit of the type including a tapped resistive divider to which the signal is applied, and a multiplexer for selecting one of a plurality of differently attenuated signals from said taps responsive to control signals, the selected signal will include switching transients due to capacitive coupling with the control signals. The switching transients are substantially eliminated by including a second tapped resistive divider to which antiphase input signal is applied, and a second multiplexer coupled to the taps of the second divider. Output signals from the multiplexer and second multiplexer are coupled to a differential amplifier which cancels the switching transients generated by the two multiplexers and constructively combines the useful signal components from the two multiplexers.

REFERENCES:
patent: 3819953 (1974-06-01), Puckette et al.
patent: 3851260 (1974-11-01), Colin
patent: 4716321 (1987-12-01), Erratico

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