A High Speed Fifth Order Gm-C Filter For Ultra-wideband Wireless Applications

• Main Authors: Fu-Chang Yang, 楊富昌
• Other Authors: Kuei-Ann Wen
• Format: Others
• Language: en_US
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/91915474391591117746

碩士 === 國立交通大學 === 電子工程系所 === 93 === A 5th order CMOS high frequency elliptic low pass filter is designed to achieve narrowest transition band. The filter is composed of Gm blocks and capacitances. The symmetrical & unsymmetrical differential pair increases Gm linearity, and negative impedance increases Gm differential output resistance. The total harmonic distortion (THD) of this filter is -40dB within 0.52Vp-p. Input-referred noise is 211.8uVrms. Dynamic range is 58.4dB for 20MHz input. The power consumption of filters is 32.25mW (include 12.1mW output buffer) from 1.8V supply. The figure-of-merit for the filter is 59.75dB. The filter is implemented in UMC 0.18-μm CMOS technology and has been packaged in SPIL QFN20 which is mounted on PCB board in favor of measurement. The f3db is 226MHz and gain is -4.07 dB with 1.32 dB passband ripple. The power dissipation of this filter is 43.2mW.