Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1999-05-14
2000-10-31
Lam, Tuan T.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327103, H03B 100
Patent
active
061408670
ABSTRACT:
Embodiments of the invention provide a transconductance control circuit, particularly for a continuous-time filter, comprising a transconductor across which a constant voltage is input. The transconductor is connected to a digital-to-analog converter (DAC) to set a reference current. A feedback loop is provided between an output of the transconductor and an input. In particular, the circuit further comprises a means for mirroring the reference current set by the DAC both to the feedback loop and to at least one cell of a cascade-connected filter.
REFERENCES:
patent: 5572163 (1996-11-01), Kimura et al.
patent: 5650950 (1997-07-01), Siniscalchi et al.
patent: 5912583 (1999-06-01), Pierson et al.
patent: 6040671 (2000-03-01), Brito et al.
Geiger et al.. "Active Filter Design Using Operational Transconductance Amplifiers: A Tutorial," IEEE Circuits and Devices Magazine, 1(2):20-32, Mar. 1985.
Bollati Giacomino
Bruccoleri Melchiorre
de Micheli Marco
Portaluri Salvatore
Galanthay Theodore E.
Iannucci Robert
Lam Tuan T.
Nguyen Linh
STMicroelectronics S.r.l.
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