An 83dB Low-Power High-Linearity Variable Gain Amplifier
نویسنده
چکیده
A newly proposed variable gain amplifier (VGA) topology is presented. The three-stage VGA offers a wide control gain range, which is independent on process variation, and is characterized by low-power, high linearity, wide range of control signal, and small chip size characteristics. The VGA is fabricated in 0.18μm CMOS technology and measurements show a gain variation of 83dB (-36~47dB) with a gain error of less than ±2dB. The P1dB and IIP3 vary from -55 and -20 to 8 and 20.5dBm, respectively. The 3-dB bandwidth is from 37 to 420MHz. The current dissipation is less than 3.4mA from 1.8V supply voltage. The chip occupies 0.4mm.
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