Adaptive filter theory (3rd ed.)
Adaptive filter theory (3rd ed.)
Distortion Analysis of Analog Integrated Circuits
Distortion Analysis of Analog Integrated Circuits
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In this paper, an active filtering technique is presented which is capable of filtering the out-of-band blockers in wireless receivers. The concept is based on the feedforward cancellation technique where a blocker replica is subtracted at the output of the low-noise amplifier (LNA). In contrast to the previously reported feedforward cancellation methods, exact gain and phase matching are easily obtained in the proposed architecture to produce a highly selective narrowband frequency response at the output of the LNA with wide rejection bandwidth. For the proof of concept, the system is implemented in a 65nm CMOS technology. It occupies a total area of 0.8mm^2 and the current consumption is 24mA from a 1.2V supply. The system post-layout simulations showed a blocker rejection of more than 33dB for blocker signals 100MHz away from the desired signal when the feedforward path is activated. The noise figure (NF) of the entire system is 3.8dB that degrades to 5.8dB when the feedforward path is activated.