An ultra-low voltage tunable dual-Band Pass Filter

In this paper we present an ultra-low voltage dual Band Pass Filter with tunable pass bands. The dual band pass filter has two pass bands which can be tuned individually and can operate at supply voltages down to 300mV. The filter is based on Pseudo Floating-Gate and in addition to frequency band adjustment, it offers gain. Both the center frequencies are controlled electronically using bias voltages through the bulk of transistors. The filter benefits from low component spread and compactness, containing only small size transistors and capacitors suited for integration. The simulations presented in this paper are valid for the 90nm CMOS transistor models from STM having a VDD equal to 1.2V and threshold voltage of 250mV.