Receive amplifier for PAM signals

Details Receive amplifier for PAM signals Receive amplifier for PAM signals

1976-09-01

1977-10-11

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328162, 330 9, 330 86, H03K 500, H03K 902, H03F 102

Patent

active

040537978

ABSTRACT:
A decoded PAM input signal is coupled through a first polarity switch (which for one polarity of a polarity signal is closed) to the positive input line of a differential operational amplifier and through the series combination of a second polarity switch (which is open for the one polarity) and an input resistor to the negative input line of the differential amplifier. The positive input line is resistively connected to ground through a first bias resistor and is also connected to ground through the series combination of a second bias resistor and a third polarity switch which is also open for the one polarity. A feedback resistor is connected between the output line and the negative input line of the amplifier. By proper selection of resistances, this circuit provides a prescribed amplification of an input signal and changes its polarity as a function of a digital polarity signal that is applied to the switches, the circuit providing no change in output signal for a change in polarity signal when the input signal is of zero amplitude.

REFERENCES:
patent: 3631355 (1971-12-01), Vail
patent: 3944852 (1976-03-01), Gilbert
patent: 3970868 (1976-07-01), Clements et al.

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