Below is the schematic of the final design. This circuit is basically a fully-differential diff-amp.  This circuit has excellent high-frequency CMRR because of the self-biasing structure. The circuit shown below was fabricated in a 0.25 um process and can operate upwards to 1,000 MHz with a 20 mV sensitivity.

 
http://cmosedu.com/jbaker/projects/sbfd.jpg

 

  http://cmosedu.com/jbaker/projects/sbfdlay.jpg

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