Low voltage high current gain CMOS digitally controlled fully differential CCII [variable gain amplifier application example]

This paper presents a digitally controlled CMOS fully differential second generation current conveyor (DCFDCCII) with a current gain between terminals X and Z where this current gain is greater than, or equal to, one. The current gain approach depends on using a current division network (CDN) in the feedback of a fully differential buffer (FDB). The presented DCFDCCII operates under a low supply voltage of /spl plusmn/1.5 V. Application of the DCFDCCII in realizing a variable gain amplifier is also presented, with the advantage of digitally tuned gain without any change of the circuit components.