Design of a Low-Power Butterworth Polyphase Filter
Yuan Guo-shun · Dianzi qijian · 2008
This paper summarizes the principle of signal processing in complex domain and introduces the implementation of a low-power Butterworth polyphase filter application to GPS radio front-end.The working voltage of this filter is 1.5 V and its power consumption is lower than 1 mW.Its character is described that center frequency is 4 MHz,the 3 dB bandwidth is 3 MHz,the ripple at a 1-MHz offset from center frequency 1 MHz is less than 0.5 dB,the rejection at image frequency is more than 70 dB.Finally its layout area for 0.18 μm technics is 0.5×0.48 mm2.