A Sub 1 V 2.4 GHz CMOS Variable-Gain Low Noise Amplifier

Chih-Lung HSIAO  Ro-Min WENG  Kun-Yi LIN  Hung-Che WEI  

IEICE TRANSACTIONS on Electronics   Vol.E87-C   No.6   pp.1003-1004
Publication Date: 2004/06/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on Analog Circuit and Device Technologies)
low voltage,  LNA,  CMOS,  RFIC,  VGA,  

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A low supply voltage CMOS variable-gain low noise amplifier (LNA) is presented in this paper. A folded cascode structure is used to reduce the supply voltage to only 1 V. The conversion gain of the LNA can be controlled by the bias voltage of the connon-gate transistor. When the input signal is weak, the circuit works at high-gain mode to improve the sensitivity. Otherwise, when the input signal is strong, the circuit works at low-gain mode to increase the linearity.