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CMOS on-chip active RF tracking filter for digital TV tuner ICs

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4 Author(s)
Sun, Y. ; Dept. of Inf. & Commun. Eng., Korea Adv. Inst. of Sci. & Technol. (KAIST), Daejeon, South Korea ; Jeong, C.J. ; Han, S.K. ; Lee, S.G.

A full frequency band active RF tracking filter design for a digital TV tuner is implemented for the first time. By combined control of the Gm and C values in the biquad of the Gm-C filter, the proposed tracking bandpass filter satisfies full frequency band tuning while maintaining narrow bandwidth. The Gm cell of the tracking filter is based on a dynamic source degenerated differential pair with optimised transistor size ratio, which provides good linearity and high-frequency operation. The fabricated tracking filter based on a 0.13 μm CMOS process shows 48 780 MHz tracking range with 15 60 MHz bandwidth, more than 50 dB of third-order harmonic rejection, 14 dB unwanted signal rejection at N + 6 channel offset, and a maximum IIP3 of 3.8 dBm at 4.7 dB gain while drawing 30 mA from a 1.2 V supply.

Published in:

Electronics Letters  (Volume:47 ,  Issue: 6 )