A 0.5-V, 2-nW, 55-dB DR, fourth-order bandpass filter using single branch biquads: An efficient design for FoM enhancement

作者：Sawigun Chutham; Ngamkham Wannaya^*; Serdijn Wouter A

来源：MICROELECTRONICS JOURNAL, 2014, 45(4): 367-374.

DOI：10.1016/j.mejo.2014.01.002

• Analog filter
• Bandpass filter
• Bionic ear processor
• Biomedical circuit
• CMOS circuit
• G(m)-C filter
• Low voltage
• Ultra low-power

A compact nano-power fourth-order bandpass filter operating from a 0.5 V supply, with an adjustable center frequency ranging from 125 Hz to 16 kHz, is presented. The filter is constituted from cascadable second-order circuit cells that are realized by a network of three transistors and two capacitors comprising only one branch of bias current. The measurement results of the filter fabricated in a 0.18-mu m CMOS IC process indicate that, for a 1 kHz center frequency, a dynamic range of 55 dB is obtained from 2 nW power consumption. These results lead to best figure of merit achieved when compared to other existing designs to date.

• 出版日期2014-4