Title :
Active-Gm-RC bandpass filter with 60MHz center frequency and a combined analog-digital tuning system
Author :
Shi, Jingbo ; Konishi, Takayuki ; Masui, Shoichi
Author_Institution :
Tohoku Univ., Sendai, Japan
fDate :
Nov. 30 2011-Dec. 2 2011
Abstract :
An active-Gm-RC bandpass filter (BPF) with a combined analog-digital tuning system is presented. The active-Gm-RC BPF biquad features a positive feedback capacitor to enhance the quality factor, and its required number of OTA per filter-order becomes 0.5. A design example for the application to an on-chip equivalent SAW filter with 60MHz center frequency and 8MHz bandwidth is presented. The proposed tuning system can be enabled with a configurable active-Gm-RC BPF/LPF. Behavioral simulations present the proper tuning for the process variation of ±20% in resistors and capacitances, the power can be reduced by a factor of 18.8 over the active-RC BPF.
Keywords :
Q-factor; RC circuits; band-pass filters; biquadratic filters; circuit tuning; surface acoustic wave filters; OTA; active-Gm-RC bandpass filter; bandwidth 8 MHz; biquad filter; combined analog-digital tuning system; frequency 60 MHz; on-chip equivalent SAW filter; positive feedback capacitor; quality factor; resistors; Band pass filters; Capacitors; Noise; Q factor; SAW filters; Transfer functions; Tuning; Active-Gm-RC; bandpass filter; digital tuning; lower power design; wireless receiver;
Conference_Titel :
Radio-Frequency Integration Technology (RFIT), 2011 IEEE International Symposium on
Conference_Location :
Beijing
Print_ISBN :
978-1-4577-0517-5
DOI :
10.1109/RFIT.2011.6141761
