A 0.7-MHz-10-MHz CT + DT Hybrid Baseband Chain With Improved Passband Flatness for LTE Application

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A hybrid baseband chain for Long-Term Evolution (LTE) was implemented in a TSMC 65-nm CMOS process. It has an active area of 0.75 mm(2) and a power consumption of 10.8 mW at a supply of 1.8 V. The proposed baseband chain consists of a continuous-time (CT) lowpass filter and a charge-domain discrete-time (DT) filter with a variable gain amplifier (VGA) and a DC-offset canceller (DCOC). The passband distortion of the DT filter is calibrated by varying the quality (Q)-factor of the CT filter, which is easily tuned by switched-resistors. The charge-domain DT filter is adopted for anti-aliasing filtering and efficient interferer rejection with small size and low power consumption. By combining the CT and the DT filters, the baseband chain acquires improved passband flatness with an in-band ripple of less than 1 dB from 0.7 MHz to 10 MHz. It also has a gain of 50.8 dB, input-referred noise of 22.8 nV/root Hz and an out-of-band IIP3 of 29 dBm.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2015-01
Language
English
Article Type
Article
Keywords

SOFTWARE-DEFINED RADIO; CMOS; RECEIVER; FILTER

Citation

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS, v.62, no.1, pp.244 - 253

ISSN
1549-8328
DOI
10.1109/TCSI.2014.2359718
URI
http://hdl.handle.net/10203/195296
Appears in Collection
EE-Journal Papers(저널논문)
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