Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2005-12-20
2005-12-20
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
C330S305000, C327S552000
Reexamination Certificate
active
06977542
ABSTRACT:
A digital tuning circuit which generates a digital code representative of a difference of signals generated by a mirror trans-conductor circuit (having electrical characteristics similar to a trans-conductor circuit in a filter) and a reference circuit. The digital code is used to adjust the trans-conductance of both the mirror trans-conductor circuit and the filter. Some of the most/more significant bits may be used to selectively activate the respective trans-conductor elements contained in the mirror trans-conductor circuit and the filter. The remaining bits may be used to fine-tune the trans-conductance of the trans-conductor elements and the filter.
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Scott T. Dupuie and Mohammen Ismail, “High Frequency CMOS Transconductors”, Book title:“Analogue IC design : The current mode Approach”—by C. Toumazou, Chapter 5, pp. 181-231, Publisher: Peter Peregrinus Ltd; ISBN No. is 0 86341 215 7.
Ganeshan Saravana Kumar
Venkatraman Srinivasan
Brady III Wade James
Le Dinh T.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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