Electronically tunable voltage-mode SIMO OTA-C universal biquad filter

This paper presents a new voltage-mode biquad filter with single-input multiple-output (SIMO) based on single-ended operational transconductance amplifiers (OTAs) and grounded capacitors. The proposed filter can provide lowpass, bandpass, highpass, bandstop and allpass voltage characteristics. The natural frequency can also be tuned electronically by adjusting the transconductance values of OTAs. The filter still enjoys no requirement with the component choice conditions and no requirement with the inverting-type input signal to realize specific filtering functions, high input impedance, and low active and passive sensitivities. PSPICE simulation results are provided to demonstrate the theoretical analysis.