Switched-Capacitor Phase Shifter Circuit with High Input Impedance and Grounded Capacitors

The paper is related to an important area of current mode analog signal processing. This study is based on the use of switched capacitor technique for realizing simple circuit function. Thus, the paper introduces a new voltage-mode phase-shifter circuit based on the switched-capacitor technique. The novel circuit uses a single current mode building block, namely an extra X current conveyor, NMOS switches and grounded capacitors. The proposed circuit is compatible for CMOS implementation. The proposed phase shifter circuit operates over a wide range frequency range and is useful in mixed signal circuit design. PSPICE simulation results are presented in support of the new proposed circuit. The circuit operates for a low supply voltage of ±0.75 V. The use of 2 MHz clock is made for presenting results at the signal frequency of 50, 100 and 200 kHz.