A 16.5 mW 4.0 GHz Bandwidth VGA Based on Capacitance Neutralization Technique in 65 nm CMOS

This paper presents a wideband variable gain amplifier (VGA) based on capacitance neutralization technique for high-speed communications and high-resolution radar systems. The negative capacitance path proposed in this paper effectively compensates the output capacitance of the VGA, thus achieving the bandwidth extension. Furthermore, it ensures a flat gain over a wide bandwidth at different gain settings. The VGA is designed in a standard 65nm CMOS process. The simulation results demonstrate that the VGA achieves a -3dB bandwidth of more than 4.0 GHz with a wide gain range from -2.8 to 49.4 dB. Moreover, it consumes 16.5 mW at a supply voltage of 1 V and has a core circuit area of 0.006mm
²
.