Low-voltage digitally controlled current differencing buffered amplifier and its application
In this paper, a design of a low-voltage digitally controlled current differencing buffered amplifier (DC-CDBA) is introduced. The realization scheme is through the cascade connection of a current differencing circuit, a current division network (CDN) and a buffered voltage amplifier. To achieve the digital control of the current gain of the circuit, a novel CDN is also proposed. The proposed DC-CDBA can operate with the low supply voltage of  1.25 V . PSPICE simulations using standard 0.5-?m 0.5 - ? m CMOS process parameters are in agreement with the theory. An application example using the proposed DC-CDBAs as active elements in the realization of the digitally tuned current-mode universal filter is also included.
current division network (cdn) current differencing buffered amplifier (cdba) mos transistor current-mode circuit