Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1997-05-14
1999-05-04
Le, Dinh
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327 80, 327 50, 327552, 327 94, 375317, 348465, H03K 500, H03K 2506, H04L 2506
Patent
active
059007494
ABSTRACT:
A circuit for generating a threshold voltage level from a time division duplex analog data signal. The circuit comprises a sample/hold circuit and an amplifier. The sample/hold circuit is arranged to sample the threshold voltage level during a reception interval and hold the threshold voltage level during a transmission interval. The amplifier includes an operational amplifier coupled to the sample/hold circuit for amplifying the analog data signal during a reception interval and amplifying the threshold voltage level during a transmission interval. A transconductance device is coupled to the operational amplifier, and a plurality of load legs are respectively coupled to a plurality of bias legs. A first selected pair of the respectively coupled load legs and bias legs is coupled to the transconductance device, and a second selected pair of the respectively coupled load legs and bias legs coupled to the output of the amplifier to provide the threshold voltage level.
REFERENCES:
patent: 5404172 (1995-04-01), Berman et al.
patent: 5412692 (1995-05-01), Uchida
OTA Linearization Via Electronically-Programmable Current Mirrors, William J. Adams and Jaime Ramirex-Angulo; pp. 2553-2556.
Regular Brief Papers; A CMOS OTA for HF Filters with Programmable Transfer Function; Eric J. van der Zwan et al.; IEEE Journal of Solids State Circuits, vol. 26, No. 11, Nov. 1991; pp. 1720-1723.
VLSI for Analog/Digital Communications; Miles A. Copeland; May 1991 IEEE Communications Magazine; pp. 25-30.
Hendrickson Alan F.
Sheldon Peter E.
Advanced Micro Devices , Inc.
Le Dinh
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