All-Pass Filter Employing Fully Balanced Voltage Differencing Buffered Amplifier

A new circuit topology of first-order all-pass filter based on FB-VDBA (Fully Balanced Voltage Differencing Buffered Amplifier) is proposed. The filter consists of one active element, one grounded capacitor, and one resistor with the resistance R=1/gm, where gm is the FB-VCBA transconductance. The filter operates in the voltage-mode, providing highimpedance input and low-impedance output. It is assembled from commercial integrated circuits, and the frequency responses measured are included. Keywords-Voltage mode; all-pass filter; FB-VCBA

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