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    Digitally programmable current amplifier
    (2012-12-01)
    Prasertsom, Danucha
    ;
    Photsathian, Thongchai
    ;
    Tangsrirat, Worapong
    In this paper, a the digitally programmable current amplifier (DP-CA) for NMOS integrated circuit implementation is presented. To provide precise digital control of the gain characteristic, the proposed DP-CA comprises current proportional gain blocks that can be digitally controlled. The proposed DP-CA can be operated from a low power supply of ±1.25V. As an application example of the proposed circuit, the digitally programmable current-mode first-order allpass filter is described. Simulation results using 0.35-μm TSMC CMOS process parameters are also included. © 2012 IEEE.
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    Low-voltage NMOS-based current differencing buffered amplifier and its application to current-mode ladder filter design
    (2006-11-01)
    Tangsrirat, W.
    ;
    Klahan, K.
    ;
    Dumawipata, T.
    ;
    Surakampontorn, W.
    An integratable circuit technique to realize a low-voltage current differencing buffered amplifier (CDBA) is introduced. The realization scheme is through the modification of a low-input resistance CCII+ and the proposed CDBA can operate with the minimum supply voltage of ±1.25∈V. In order that the signal path consists of only NMOS transistors, a negative current mirror using NMOS transistors is employed. With standard 0.5∈μm CMOS process parameters, PSPICE simulation results show that the proposed CDBA provides the terminal resistance of , , and the -3∈dB bandwidth of about 500∈MHz. Application examples employing the proposed CDBA as active elements in the leapfrog simulation of current-mode ladder filters are also included.