Abstract—Superheterodyne TV tuners have been implemented
in discrete forms using tunable RF and SAWIF filters. Integrating
TV tuners in CMOS technology without them is a challenging task
to cope with technical issues such as harmonic mixing and image.
The image rejection in low- or zero-IF systems has been limited to
30–40 dB by analog imperfections such as path gain and phase
mismatches. A single-chip low-IF TV tuner solution is proposed so
that the image can be suppressed digitally using an image cancellation
technique based on a complex one-tap LMS signal decorrelation
algorithm. Programmable digital filtering and video/sound demodulation
make a multistandard TV tuner feasible in the 48–860
MHz VHF/UHF band. The chip has a maximum gain of 63 dB and
an input automatic gain control (AGC) range from 15 to 25 dB
with 0.85-dB steps. It achieves an image and IF rejection of 60 dB,
a peak carrier-to-noise ratio (CNR) of 55 dB, and a peak sound
signal-to-noise ratio (SNR) of 44 dB without frequency modulation
(FM) de-emphasis. The prototype occupies 6 6 mm2 in 0.25- m
CMOS and consumes 1 W at 2.5 V.
【文件名】:061226@52RD_JSSC05Dec_Song_TVtuner.pdf
【格 式】:pdf
【大 小】:1530K
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