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![Fig. 2. The CMOS circuit of the four-MOS transistor cell [6].](profile/Soliman-Mahmoud-2/publication/272356174/figure/fig2/AS:391791170867201@1470421702120/The-CMOS-circuit-of-the-four-MOS-transistor-cell-6_Q320.jpg)
A new CMOS voltage-controlled fully-differential transconductor is presented. The basic structure of the proposed transconductor is based on a four-MOS transistor cell operating in the triode or saturation region. It achieves a high linearity range of ± 1 V at a 1.5 V supply voltage. The proposed transconductor is used to realize a new fully-differ...
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Citations
... [3], [4] utilize saturation-based MOSFETS to implement wide-range highly linear OTAs. The stacked transistor configuration demands high power supplies. ...
... is defined as . If is equal to , the output currents are obtained as (4) As shown in (4), the output currents are linearly related to and the transconductance linearly depends on the tuning voltage. Assuming that the dc gain of the regulation amplifier equals to , the impedance seen into the drain of is approximately expressed as (5) ...
The operational transconductance amplifier (OTA) is one of the most significant building-blocks in integrated continuous-time filters. Traditional OTAs suffer linearity reduction as a result of the MOSFET scaling trend. In this paper, a body-driven (BD) CMOS triode-based fully balanced OTA is proposed to achieve low distortion and linear frequency tuning. In contrast to the gate-driven based OTAs (that have the tradeoff of input and tuning range), BD-based OTAs operate under a wide input range over a large tuning interval. Common-mode (CM) feedforward and CM feedback schemes have been developed so that the CM voltage varies only 7 mV over a tuning range of 1.2 V = Vtune = 1.58 V. Using the 0.18-mum N-well CMOS process, a third-order elliptic low-pass filter is implemented with the aid of the proposed OTA. The total harmonic distortion ( is -45 dB for 0.8-V peak-peak (Vpp) fully differential input signals. A dynamic range of 45 dB is obtained with the OTA's noise integrated over 1 MHz.
This paper presents a new first-order allpass filter using bulk-driven transconductor which is suitable for biological signal processing applications. The proposed filter employs one transconductor, one resistor and two capacitors. The bulk-driven MOS transistor technique is used to provide 0.5 V supply voltage operation. The workability of the proposed topology is expressed through PSPICE simulators using TSMC 0.18 µm n-well CMOS process. Simulation results show that the circuit consumes the power of 11.7 µW and has total harmonic distortion (THD) of 1% for input signal of 30 mV P-P .
A novel tunable transconductor is presented. Input transistors operate in the triode region to achieve programmable voltage-to-current conversion. These transistors are kept in the triode region by a novel negative feedback loop which features simplicity, low voltage requirements, and high output resistance. A linearity analysis is carried out which demonstrates how the proposed transconductance tuning scheme leads to high linearity in a wide transconductance range. Measurement results for a 0.5 CMOS implementation of the transconductor show a transconductance tuning range of more than a decade (15 to 165 ) and a total harmonic distortion of -67 dB at 1 MHz for an input of 1 Vpp and a supply voltage of 1.8 V.
