hi!
I couldn't undrestand how to analyze this circuit. this circuit is in Capacitively-Coupled Chopper Amplifiers's book in page 65.

 

no one's could help me?
I want to design and analyze in cadance specture but I don't know where i start.

 

Hi!

I can help you. Sorry that you needed to wait, but sometimes, especially during the weekend I'm not on the forum.

It's 2-stages AB folded cacode opamp with differential output. Do you have any experience with CMOS analog IC opamps? You may find useful information in books as Razavi or Baker. If you need something that is online, please take a look here: https://payhip.com/b/5Srt. In the preview of this position page 50 (ch. 3.1.1) there is a basic class A opamp explained which may be helpful for you if you do not have any experience with opamps.

Please, tell me how can I help you more.

 

sir!
i need variable gain amplifier circuit with functional details
please......

 

Something like this: http://ieeexplore.ieee.org/document/6225742/ ?

 

sir!
i need variable gain amplifier circuit with functional details
please......

Since you provided no details about the amplifier then nobody can help you.
AC or DC? Supply voltage? Frequency response? How much gain? Input impedance? Power output? Transistors, Mosfets or ICs? etc.