H - Electricity – 03 – K
Patent
H - Electricity
03
K
354/67
H03K 5/00 (2006.01) H03F 1/02 (2006.01) H03K 5/02 (2006.01) H03K 9/02 (2006.01)
Patent
CA 1111139
ABSTRACT OF THE DISCLOSURE 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 zero amplitude.
282871
Mcgibbon Gregor D.
Tosuntikool Nam
Gte Automatic Electric Laboratories Incorporated
R. William Wray & Associates
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