Device for converting a symmetrical signal into an asymmetrical

Details Device for converting a symmetrical signal into an asymmetrical Device for converting a symmetrical signal into an asymmetrical

1998-09-22

2000-12-26

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455575, H04B 100

Patent

active

06167284&

ABSTRACT:
A converter device with a symmetrical device input and an asymmetrical device output has a transconductance input module that converts the device input voltage to an output current. A resistive module transforms the output current into a voltage referenced a predetermined potential. The transconductance input module has two transistors forming a differential pair and a subtracter connected between the differential pair outputs and the resistive module. The subtracter has three current mirrors and provides the resistive module with a current which is the difference between transfer currents of the two transistors of the differential pair. A second differential pair is provided between the device input and the first differential pair.

REFERENCES:
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SA1630 Data Sheet, Phillips Semiconductors, Jul. 1998.
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By M.G.R. Degrauwe et al. "IDAC: An Interactive Design Tool for Analog CMOS Circuits" IEEE Journal of Solid-State Circuits, vol. SC-22, No. Dec. 6, 1987, pp. 1106-1116,; Figures 2, 12.

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