Noise-shaped blocker-reject amplifier

Details Noise-shaped blocker-reject amplifier Noise-shaped blocker-reject amplifier

2008-06-04

2009-11-17

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S303000

Reexamination Certificate

active

07619472

ABSTRACT:
A fully differential amplifier that amplifies and filters a signal band of a communications channel, the signal band including a desired signal and at least one blocker signal of an adjacent communications channel, the fully differential amplifier includes a fully differential operational amplifier (op-amp) with a common mode feedback, the fully differential operational amplifier amplifying the desired signal, a variable input resistance connected to an input of the fully differential op-amp, and an asymmetric floating frequency dependent negative resistance (AFFDNR) filter connected to the fully differential op-amp between the input and an output of the fully differential op-amp. A plurality of inputs of the fully differential op-amp may be virtually grounded to reduce swings in a voltage. The AFFDNR filter filters the at least one blocker signal and includes a plurality of resistors that implement a high order filtering of the at least one blocker signal.

REFERENCES:
patent: 7088985 (2006-08-01), Ismail
patent: 7202741 (2007-04-01), Park et al.
patent: 2008/0297239 (2008-12-01), Elwan et al.

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