Low-Voltage and Low-Power Analog Integrated Filters implementing Current-mode Bulk-Driven Differentiators

Abstract

This work introduces a CTCM Gate-driven (GD) and Bulk-driven (BD) differentiators using the TSMC 65 nm CMOS technology as an alternative to existing integrator circuits. This CM differentiator exhibits higher stability and lower flicker noise than the voltage-mode integrator. Bilinear as well as biquadratic building blocks based on these differentiators have been introduced. These basic building blocks are then used to implement higher order filters using the GD and BD Techniques. A 6th order cascade CTCM Chebyshev band pass filter using the Gate- Driven and Bulk-Driven techniques has been designed. This design is simulated with a very low supply voltage of 0.7 V with the filter characteristics of 1dB pass band ripple and 2MHz bandwidth. The total power consumption of the designed sixth-order BD CTCM Chebyshev band pass filter is 1.45 mW which is very low in analog IC filter design. The proposed design can be realized for wireless baseband applications where LVLP is an important factor.