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Author: search.filters.author.Prasertsom, DanuchaSubject: search.filters.subject.Current differencing buffered amplifier (CDBA)

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    Low-voltage digitally controlled current differencing buffered amplifier and its application
    (2009-04-03)
    Tangsrirat, Worapong
    ;
    Prasertsom, Danucha
    ;
    Surakampontorn, Wanlop
    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 - μ 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. © 2008 Elsevier GmbH. All rights reserved.