Title :
A low-power programmable low-pass switched capacitor filter using double sampling technique
Author :
Zahabi, A. ; Shoaei, O. ; Koolivand, Y. ; Shamsi, Hossein
Author_Institution :
Dept. of ECE., Tehran Univ., Iran
Abstract :
A fifth order low-pass Chebyshev II filter with cascaded biquad realization has been designed which is digitally programmable with variable-rate (three lower cut-off frequency fc=8, 12, 20 MHz). Using very useful high frequency techniques such as double sampling scheme (DSS) and differencing-input SC integrators, the sampling frequency of designed filter is up to fs=103.68 MHz (fs=2fclk=103.68 MHz) with a SFDR=68 dB and THD=62 dB. The attenuation of filter is more than 30 dB at 1.5 fc and more than 40 dB at 1.75 fc, respectively. Input and output swing of the filter is 1.6 Vpp with 3 V supply in a 0.35 μm CMOS technology consuming approximately 45 mW power in the worst power case.
Keywords :
CMOS digital integrated circuits; Chebyshev filters; SPICE; digital filters; digital simulation; harmonic distortion; integrated circuit design; low-pass filters; low-power electronics; programmable filters; sampling methods; switched capacitor filters; 0.35 micron; 103.68 MHz; 12 MHz; 20 MHz; 3 V; 45 mW; 8 MHz; CMOS technology; HSPICE; MATLAB simulation; SC integrator; THD; cut-off frequency; digitally programmable filter; double sampling technique; filter attenuation; high frequency technique; low pass Chebyshev II filter; low pass switched capacitor filter; low power programmable filter; sampling frequency; spurious free dynamic range; Active filters; CMOS technology; Capacitors; Circuit simulation; Clocks; Cutoff frequency; Low pass filters; Process design; Robust stability; Sampling methods;
Conference_Titel :
Microelectronics, 2004. ICM 2004 Proceedings. The 16th International Conference on
Print_ISBN :
0-7803-8656-6
DOI :
10.1109/ICM.2004.1434750
