Programmable monolithic Gm-C band-pass filter: design and experimental results

Abstract

We propose in this paper a programmable bandpass filter based on an array of fully differential transconductance circuits that controls the filter parameters. The signal path does not contain any switch, and fine-tuning of the filter parameters is implemented using programmable capacitors. A digital building block is implemented in the proposed band-pass filter to tune its central frequency as well as its bandwidth. The filter circuit is based on a biquad topology, which is designed and implemented with CMOS 0.18 lm technology. Experimental results show a programming ability of the center frequency between 5.9 and 58 MHz, and the quality factor can be tuned from 0.36 to 10. These features are obtained for a total power consumption of less than 10.5 mW from a single 1.8 V power supply.

Resistorless Reconfigurable nth-Order Filter Based on DPCDTA for Multi-mode Filtering Applications

“…Commercially available FPAA chips and reconfigurable analog devices, such as MPAA020 from Motorola, AN10E40 from Anadigm, or ispPAC family from Lattice Semiconductor Corporation, have already hit the market greatly [2][3][4]. While programming frequency parameters and reconfiguring the order of the analog nth-order filter are core parts of multimode wireless communication equipment utilizing FPAAs, they are vital for achieving the required selectivity and sensitivity, regardless of hardware changes and the application running on the system processor [5,6].…”