Two Stage Highly Selective Receiver Front End Based on Impedance Transformation Filtering
2015 (English)In: IEEE Transactions on Circuits and Systems - II - Express Briefs, ISSN 1549-7747, Vol. 62, no 5, 421-425 p.Article in journal (Refereed) Published
In order to achieve blocker rejection comparable to surface acoustic wave (SAW) filters, we propose a two-stage tunable receiver front-end architecture based on impedance frequency transformation and low-noise transconductance amplifier (LNTA) circuits. The filter rejection is captured by a linear periodically varying model that includes band limitation by the LNTA output impedance and the related parasitic capacitances of the impedance transformation circuit. The effect of thermal noise folding on the circuit noise figure, as well as clock phase mismatch on filter gain are also discussed. As a proof of concept, a chip design of a tunable radio-frequency front end using 65-nm CMOS technology is presented. In measurements the circuit achieves blocker rejection competitive to SAW filters with noise figure 3.2-5.2 dB, out of band IIP3 > +17 dBm and blocker P1 dB > +5 dBm over frequency range of 0.5-3 GHz.
Place, publisher, year, edition, pages
2015. Vol. 62, no 5, 421-425 p.
SAW-less receiver, N-path filter, wideband selective RF front-end
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:liu:diva-112879DOI: 10.1109/TCSII.2014.2385213ISI: 000353636400001OAI: oai:DiVA.org:liu-112879DiVA: diva2:773294