A single-to-differential LNA topology with robust output gain-phase balancing against balun imbalance

Author

Martins, Miguel A. ; Mak, Pui-In ; Martins, Rui P.

Author_Institution

Analog & Mixed Circuit Group, INESC-ID, Lisbon, Portugal

fYear

2011

fDate

15-18 May 2011

Firstpage

289

Lastpage

292

Abstract

This paper presents a technique to enhance the output balancing precision of a low-noise amplifier (LNA) against balun imbalance. By utilizing two capacitive-cross-coupling common-gate amplifiers in cascode, wideband output balancing, high voltage gain and low noise figure (NF) can be concurrently achieved. A 2.4 GHz LNA design example optimized in a 0.13 μm CMOS process shows that the tolerable balun´s gain and phase imbalances are up to 2 dB and 10°, respectively. With just 3.6 mW of power, the NF is 2.6 dB at a voltage gain of 30 dB.

Keywords

CMOS integrated circuits; UHF amplifiers; baluns; low noise amplifiers; CMOS process; balun gain; capacitive-cross-coupling; cascode balancing; common-gate amplifiers; frequency 2.4 GHz; gain 30 dB; low-noise amplifier; noise figure 2.6 dB; phase imbalances; power 3.6 mW; robust output gain-phase balancing; single-to-differential LNA topology; size 0.13 mum; wideband output balancing; Gain; Impedance; Impedance matching; Noise; Noise figure; Robustness; Transistors;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (ISCAS), 2011 IEEE International Symposium on

Conference_Location

Rio de Janeiro

ISSN

0271-4302

Print_ISBN

978-1-4244-9473-6

Electronic_ISBN

0271-4302

Type

conf

DOI

10.1109/ISCAS.2011.5937558

Filename

5937558