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    Novel oscillator based on voltage and current Gain adjusting used for control of oscillation frequency and oscillation condition
    (2013-06-28)
    Sotner, R.
    ;
    Jerabek, J.
    ;
    Jaikla, W.
    ;
    Herencsar, N.
    ;
    Vrba, K.
    The paper deals with novel controllable oscillator where two types of electronic control are used. Proposed second-order circuit contains current follower, adjustable current amplifier, adjustable voltage amplifier, two resistors and two grounded capacitors. Oscillation frequency is tuned by voltage gain of used voltage amplifier that is represented by high-frequency voltage-mode multiplier. Oscillation condition is automatically regulated by current gain of the adjustable current amplifier which is based on current-mode multiplier. Experimental results confirmed workability of the circuit.
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    Externally linear current amplifiers
    (2007-06-01)
    Tongkulboriboon, S.
    ;
    Pawarangkoon, P.
    ;
    Kiranon, W.
    This paper describes a method to implement externally linear internally non-linear (ELIN) current amplifiers. Two novel schemes of ELIN current amplifier circuits are proposed, including hyperbolic sine (SINH) and hyperbolic tangent (TANH) circuits. The obtained linear input-current ranges of SINH and TANH circuits are 400 Ap-p with total harmonic distortion (THD) less than 2% and 140 Ap-p with THD less than 0.2%, respectively, both at the input frequency 1 kHz. Also, the current gains of the proposed circuits can be varied either in positive or negative region by adjusting the dc bias currents. Their current gains are tunable in the range of -10 A/A to 10 A/A and insensitive to temperature. Simulation results show that the performance of the circuits are as good as expected.
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    Low-voltage current-sensing CMOS interface circuit for piezo-resistive pressure sensor
    (2007-01-01)
    Thanachayanont, Apinunt
    ;
    Sangtong, Suttisak
    A new low-voltage CMOS interface circuit with digital output for piezo-resistive transducer is proposed. An input current sensing configuration is used to detect change in piezo-resistance due to applied pressure and to allow low-voltage circuit operation. A simple 1-bit first-order delta-sigma modulator is used to produce an output digital bitstream. The proposed interface circuit is realized in a 0.35 μm CMOS technology and draws less than 200 μA from a single 1.5 V power supply voltage. Simulation results show that the circuit can achieve an equivalent output resolution of 9.67 bits with less than 0.23% non-linearity error.