A Full Integrated Gain Variable LNA for WCDMA

—In this paper we propose a gain-variable low noise amplifier (LNA) for low-voltage and low power WCDMA application. The LNA is designed based on a current-reused topology and a variable gain circuit. The test chip is simulated and fabricated with the TSMC 0.18 μm CMOS process. Experimental results show that the LNA exhibits 20 dB of gain, 3.5 dB of noise figure and -12dB of input return loss (S11), and -7dB of output return loss (S22) while consuming a DC power of 3.2 mW from a 1V supply voltage. Due to the operation for low-voltage and low-power environment, the attained IIP3 is -12.5dBm and P1dB

• Type: Journal
• Year: 2007
• Where: ENGL
• Authors: Zhi-Ming Lin, Yu-Chun Huang
• Keywords: ENGL 2007, Gain-variable Low Noise, Low Power Wcdma, Variable Gain Circuit