Patent ID: 7619472
Filing Date: 2009-11-17
Classification: H03F,H03H

Abstract:
1. A fully differential amplifier that amplifies and filters a signal band of a communications channel, wherein said signal band comprises a desired signal and at least one blocker signal of an adjacent communications channel, said fully differential amplifier comprising: a fully differential operational amplifier (op-amp) with a common mode feedback, said fully differential operational amplifier amplifying said desired signal; a variable input resistance connected to an input of said fully differential op-amp; and an asymmetric floating frequency dependent negative resistance (AFFDNR) filter connected to said fully differential op-amp between said input and an output of said fully differential op-amp, said AFFDNR filter filtering said at least one blocker signal, wherein said AFFDNR filter comprises a plurality of resistors that implement a high order filtering of said at least one blocker signal.