Low distortion driver employing positive feedback for reducing p

Details Low distortion driver employing positive feedback for reducing p Low distortion driver employing positive feedback for reducing p

1996-11-20

1999-01-05

Mottola, Steven

Amplifiers

Signal feedback

Amplifier in signal feedback path

330103, 330104, H03F 134

Patent

active

058567585

ABSTRACT:
A line driver with positive feedback reduces the output signal amplitude excursion required for driving a communication line, and enables the driver's output impedance to be synthesized using a reduced component value, thereby achieving a reduction in power loss through the output resistor, while simultaneously matching the effective electrical value of the driver's output impedance to the line. The line driver includes an operational amplifier having differential polarity inputs and an output. An output resistor, whose value is a fraction of the line impedance, is coupled between the amplifier output and an output node coupled to the line. A negative feedback resistor is coupled between the amplifier output and an inverting input. A further resistor is coupled between the amplifier output and a non-inverting input. The further resistor has a value of k*R, where m=(k+1)/(k-1), R is the value of each of input and negative feedback resistors, and m is the ratio of the desired output resistance Rt to the value Ro of the line driver's output resistor.

REFERENCES:
patent: 4290024 (1981-09-01), Yokoyama
Wen, y., "Converting a Voltage Amp to a Transconductance Amp", New Electronics , vol. 14, No. 15, Jul. 28, 1981, p. 17.
IBM Tech. Disc. Bull. , vol. 30, No. 10, Mar. 1988, pp. 220-221.

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