Abstract
In this paper, a symmetrical operational transconductance amplifier (OTA) circuit with extended bandwidth using resistive compensation technique is proposed. Into the all current mirrors of the symmetrical OTA circuit, this technique is applied. A passive resistor is connected between the gate and the drain of each primary transistor of the current mirrors in the symmetrical OTA structure. In addition, filter structures are realized in order to analyze the performance of the symmetrical OTA with extended bandwidth. Thus, the advantage of using resistive compensation technique is demonstrated. The symmetrical OTA with extended bandwidth and the filters are simulated with LTSPICE by using TSMC 0.18 μm CMOS process parameters.
Highlights
Operational transconductance amplifiers (OTA) are significant active elements for continuous-time signal processing applications
Resistive compensation technique is applied to the current mirrors of the OTA in order to increase the transconductance bandwidth
Both symmetrical OTA and filter circuits are analyzed with LTSPICE using 0.18 μm TSMC CMOS process parameters
Summary
Operational transconductance amplifiers (OTA) are significant active elements for continuous-time signal processing applications. A resistive compensation technique can be used to widen bandwidth of the circuits [15,16,17]. Resistive compensation technique is applied to the current mirrors of the OTA in order to increase the transconductance bandwidth. M. Konal et al.; Informacije Midem, Vol 51, No 2(2021), 95 – 100 changing the biasing current and resistive compensation technique can be applied to the circuit with different resistor values. In order to demonstrate the performance of the proposed OTA, it is used in a second order low-pass filter structure. Both symmetrical OTA and filter circuits are analyzed with LTSPICE using 0.18 μm TSMC CMOS process parameters
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