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

다국어 초록 (Multilingual Abstract)

<P>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 <I>Gm</I> and <I>C</I> values in the biquad of the <I>Gm</I>-<I>C</I> filter, the proposed tracking bandpass filter satisfies full frequency band tuning while maintaining narrow bandwidth. The <I>Gm</I> 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.</P>