2.1声道功放电路，电路简洁，音质好，便于兴趣爱好者自制-2.1 channel amplifier circuit, circuit simplicity, good sound quality, easy to enthusiasts interested in self-

disign whit HSPICE: Design and simulate a two stage CMOS operational amplifier shown in the Fig., for these conditions:  DC Voltage Gain > 60dB  Unity Gain Bandwidth > 70MHz  Phase Margin > 50 degrees 

A 20-GHz low noise amplifier (LNA) is designed in 0.13 CMOS technology. The proposed amplifier employs twocascade stages to achieve a peak power-gain of 25 dB and a noisefigure of 4.8 dB at 20.4 GHz. The power consumption of the LNA circuit is 12.2