Noise-Shaping Gain-Filtering Techniques for Integrated Receivers
Tekin, A.
Elwan, H.
Ismail, A.
Pedrotti, K.
Dept. of Electr. Eng., Univ. of California, Santa Cruz, CA, USA;
This paper appears in: Solid-State Circuits, IEEE Journal of
Publication Date: Oct. 2009
Volume: 44,
Issue: 10
On page(s): 2689-2701
ISSN: 0018-9200
INSPEC Accession Number: 10880537
Digital Object Identifier: 10.1109/JSSC.2009.2027537
Current Version Published: 2009-09-22
Abstract
In this paper, a new technique for realizing area-efficient, low-noise filters is introduced. The proposed filter topologies utilize noise shaping techniques to shift the noise of the passive and active filter components out of the passband of the filter. This is illustrated by implementing a programmable noise-shaped post-mixer gain-filtering circuit for a CMOS Mobile-TV tuner. The proposed circuits relax the noise-linearity tradeoff in the receiver chain by providing blocker rejection following the mixer outputs. The filter provides an in-band input referred noise density as low as 7.5 nV/sqrt(Hz). The measured out-of-band IIP3 values are 30 dBV and 31.5 dBV for the 3.8-MHz (DVB-H) and 750-kHz (ISDB-T) modes, respectively. Total current consumption is 5.5 mA from a 1.2-V supply. The gain of the block is programmable to be 0 dB, 8 dB, 14 dB, or 20 dB. The design occupies a die area of 0.28 mm2 in a 65-nm CMOS process covering a frequency band of 700 kHz to 5.2 MHz as a universal mobile-TV integrated baseband gain-filtering solution.
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