A 2.5-GHz Receiver Front-End With $Q$-Boosted Post-LNA $N$-Path Filtering in 40-nm CMOS

Autor:	Kimmo Koli, Mikko Englund, Kari Stadius, Mikko Kaltiokallio, Kim B. Ostman, Jussi Ryynanen, Olli Viitala
Rok vydání:	2014
Předmět:	Third-order intercept point Radiation CMOS Radio receiver design Computer science Attenuation Amplifier Electronic engineering RLC circuit Filter (signal processing) Electrical and Electronic Engineering Condensed Matter Physics Noise figure
Zdroj:	IEEE Transactions on Microwave Theory and Techniques. 62:2071-2083
ISSN:	1557-9670 0018-9480
DOI:	10.1109/tmtt.2014.2333714
Popis:	This paper presents the analysis, design, and measurements of a 2.5-GHz receiver front-end in a 40-nm CMOS technology. The front-end utilizes RLC-resonator quality factor (Q) boosting and four-phase N-path filtering to improve the blocker filtering capabilities of the low-noise amplifier (LNA). Systematic analysis is performed in order to obtain a thorough design approach. Particular attention is paid to the passive mixer switches in the RLC case, for which we show that minimum switch resistance does not provide best noise figure (NF), nor best relative blocker attenuation. Moreover, the N-path filter extends the stable operating region of a Q-boosted LNA, and adding a noisy Q-boosting circuit can actually improve the receiver NF in practical realizations. The experimental CMOS front-end is flip-chip packaged, and a parasitic-aware input matching method for the electrostatic-discharge-protected LNA is proposed, analyzed, and verified. In nominal operation, the programmable front-end achieves a measured gain of 39 dB, an NF of 3.5 dB, and an out-of-band input-referred third order intercept point of > 0 dBm, while consuming 48 mA from a 1.1-V supply.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5f7549e0ae7fa90f1581c281f37d722d https://doi.org/10.1109/tmtt.2014.2333714 Zobrazit plný text záznamu