Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2007-07-24
2007-07-24
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
C327S557000
Reexamination Certificate
active
11336121
ABSTRACT:
A complex band-pass filter. The complex band-pass filter includes a band-pass filter coupled to a voltage source. The band-pass filter includes a first plurality of transconductors that receives a first voltage, where the first voltage controls the center frequency of the band-pass filter. The band-pass filter also includes a second plurality of transconductors, wherein the second plurality of transconductors receives a second voltage, where the second voltage controls the bandwidth of the band-pass filter. According to the system disclosed herein, the complex band-pass filter has automatic frequency tuning against process variations, a programmable center frequency, and a programmable bandwidth. Providing programmability to the center frequency (Fc) and bandwidth (BW) offers an alternative for multi-protected standards with different channels (Fc changes) and for time acquisition improvements (BS changes).
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Atmel Corporation
Le Dinh T.
Sawyer Law Group LLP
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