Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1997-04-16
1999-11-30
Ton, My-Trang Nu
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
H03K 522
Patent
active
059949260
ABSTRACT:
A programmably variable transconductance circuit (10) and method for varying its transconductance includes first and second current control input devices (16, 18), each having an input (17,19) to which a differential input voltage may be applied. A pair of current steering circuits (26, 28, 30, 32) are each connected in series with a respective one of the first and second current control devices (16, 18) for dividing respective currents in the first and second current control devices (16, 18) between a differential output current path (12, 14) and another current flow path, and a programmable voltage source (90) supplying V.sub.CONTROL is connected to control the current division by the current steering circuits (26, 28, 30, 32). The programmable voltage, V.sub.CONTROL, is provided by a programmable current control loop (90), which incorporates a master transconductance circuit, to establish a constant transconductance independently of temperature variations. A dynamically controllable resistance, such as an MOS transistor (24), or the like, is connected between the first and second current control input devices (16, 18), and a second voltage source (V.sub.GATE) is connected to the dynamically controllable resistance (24) to maintain the dynamically controllable resistance (24) at a constant value.
REFERENCES:
patent: 4663594 (1987-05-01), Perkins
patent: 5355391 (1994-10-01), Horowitz et al.
patent: 5552742 (1996-09-01), Perkins
patent: 5663690 (1997-09-01), McGinn
patent: 5729230 (1998-03-01), Jensen et al.
Choi Davy H.
Krenik William R.
Siniscalchi Patrick P.
Brady III Wade James
Donaldson Richard L.
Nu Ton My-Trang
Swayze, Jr. W. Daniel
Texas Instruments Incorporated
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