Abstract:
This thesis presents the design method of voltage-mode biquadratic filter circuit using operational transconductance amplifier and uniform distributed RC both single layer and double layers. The circuits design can be synthesized of four type standards frequency responses include lowpass, highpass, bandpass and band-reject from the same topology. The propose circuits operate in voltage-mode without the circuit for convert currentmode to voltage-mode requirement and the supply voltage with only ±2VDC. In addition, the frequency response can be adjusted by capacitance parameter of uniform distributed RC and adjusting the transconductance gains of the operational transconductance amplifier without affecting
the quality factor. The simulation results of circuit using PSpice and MATLAB indicated that good magnitude response, good stability, constant group delay in pass band and low sensitivities less than one unit. The advantages of the uniform distributed RC circuit can support frequency up to 10 MHz.
In addition, the biquad filter is simply constructed with two operational transconductance amplifiers and two uniform distributed RC. The designed circuit is suitable for implementing in integrated form especially in VLSI design.