Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1997-12-30
1999-06-15
Wells, Kenneth B.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327563, 330 86, 330282, H02M 700
Patent
active
059125837
ABSTRACT:
A transconductor is provided having a transconductance G.sub.m. This transconductance is then attenuated with a steering circuit (41) to attenuate the overall transconductance of the transconductor and vary the bandwidth. A fixed voltage is then input to the transconductor with the output thereof offset with a programmable current DAC (48). This output is then provided to an error amplifier (46) for developing an error voltage. This error voltage is then input back to the input of the transconductor to adjust the transconductance thereof to minimize this error. The steering circuit (41) is controlled by a voltage DAC (58) to program the attenuation provided thereby. Both the voltage DAC (58) and the current DAC (48) are controlled by a bandwidth control signal to program the bandwidth of the overall transconductor. This is facilitated while compensating for the process and temperature variations of the transconductance of the transconductor. This is also facilitated with a master/slave relationship.
REFERENCES:
patent: 5404058 (1995-04-01), Nishijima
patent: 5446676 (1995-08-01), Huang et al.
patent: 5493250 (1996-02-01), Kasperkovitz et al.
patent: 5510738 (1996-04-01), Gorecki et al.
patent: 5553008 (1996-09-01), Huang et al.
patent: 5625317 (1997-04-01), Deveirman
patent: 5736885 (1998-04-01), Wietecha et al.
Pierson Richard C.
Venkatranan Srinivasan
Brady III Wade James
Donaldson Richard L.
Nguyen Hai L.
Swayze, Jr. W. Daniel
Texas Instruments Incorporated
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