Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1998-06-30
2000-06-06
Lam, Tuan T.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327543, 330288, 323315, H03F 3343
Patent
active
060723599
ABSTRACT:
A current generator circuit with controllable frequency response has at least one current mirror formed of MOS transistors, being powered through a terminal held at a constant voltage, having an input leg through which a reference current (I1) is driven by a first current generator (G1), and having an output leg for generating, on an output terminal (OUT) of the mirror, a mirrored current (I.sub.out) which is proportional to the reference current (I1). The input leg includes at least a first transistor (M1) which is diode-connected and has a control terminal (Ga1) coupled to a corresponding terminal (Ga2) of a second transistor (M2) included in the output leg. In accordance with the invention, the mirror circuit also has an impedance matching circuit connected across the control terminals (Ga1 and Ga2) of the first and second transistors and configured to hold the same voltage value at both terminals (Ga1 and Ga2). The impedance matching circuit has an adjustable output impedance, specifically lower in value than the value to be had without this circuit. It functions to regulate the impedance on the control node (Ga2) of the second transistor (M2). The invention is equally applicable to N-channel and P-channel MOS transistors. Advantageously, the reference current can be varied by an external signal which is a function of the output signal, to provide feedback regulating features.
REFERENCES:
patent: 4019071 (1977-04-01), Ahmed
patent: 4686487 (1987-08-01), Radovsky
patent: 4879524 (1989-11-01), Bell
patent: 5349307 (1994-09-01), Inagaki
patent: 5612614 (1997-03-01), Barrett, Jr. et al.
"Microelectronic Circuits", Sedra et al., Published by Saunders College Publishing, pp 440-443, 1991.
Brambilla Davide
Lecce Sergio
Nebuloni Daniela
Rossi Giorgio
Galanthay Theodore E.
Lam Tuan T.
SGS-Thomson Microelectronics S.R.L.
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