New voltage-mode high-pass, band-pass and low-pass filter using DDCC and OTAs

The voltage-mode (VM) biquad filter is presented, which employs one differential difference current conveyor (DDCC), two single-ended operational transconductance amplifiers (OTAs) and two grounded capacitors. The proposed circuit can realize three kinds of filter response that is low-pass, high-pass and band-pass filters from the same configuration. The proposed circuit has no requirements for component-matching conditions and all of elements have no floating effects and any resistances. The proposed circuit has been confirmed by HSPICE simulations and compared with theoretical functions by MATLAB. Finally, to verify our architecture, we have designed this analog filter chip with TSMC 0.35 μ m 2P4M CMOS technology. This chip contains 129 transistors, operates to 2.18 MHz and consumes 83 mW. The chip area of the analog filter is 0.822 mm².