Title :
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
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;
Conference_Titel :
Circuits and Systems (ISCAS), 2011 IEEE International Symposium on
Conference_Location :
Rio de Janeiro
Print_ISBN :
978-1-4244-9473-6
Electronic_ISBN :
0271-4302
DOI :
10.1109/ISCAS.2011.5937558
