Sharp Programmable Passive Filters based on Filtering by Aliasing

Speaker: Neha Sinha
Affiliation: UCLA Ph.D. Candidate

Department Research Forum – Circuits and Embedded Systems

Hosted by Prof. Danijela Cabric

Abstract: Communication systems are moving towards software-defined radios and cognitive radios. These systems require receivers that are programmable, highly selective and handle a large dynamic range. To this end, filters based on the Filtering by Aliasing (FA) principle offer a good solution. These filters can be created by optimally varying the resistance in a simple RC filter, enabling the single-pole circuit to provide very sharp filter responses that appear LTI at the sampling instances. One such filter is implemented in the 65nm CMOS process. The core circuit consists of a variable resistor, realized as a 10-bit resistor ladder, in series with a capacitor whose output is periodically sampled. The filter achieves sharp transition bandwidths (4.2xBW) and >50dB stop-band attenuation. The low-pass filters achieve an OOB linearity of +31dBm while the band-pass filters have +22dBm linearity.


Date(s) - Oct 28, 2015
12:00 pm - 1:00 pm

E-IV Tesla Room #53-125
420 Westwood Plaza - 5th Flr., Los Angeles CA 90095