DocumentCode :
262033
Title :
3.6 A noise-cancelling receiver with enhanced resilience to harmonic blockers
Author :
Murphy, Damian ; Darabi, Hooman ; Hao Xu
Author_Institution :
Broadcom, Irvine, CA, USA
fYear :
2014
fDate :
9-13 Feb. 2014
Firstpage :
68
Lastpage :
69
Abstract :
By employing two passive-mixer-based downconversion paths, the frequency-translational noise-cancelling receiver (FTNC-RX) achieves a low noise figure and can tolerate most out-of-band blockers up to 0dBm with little performance degradation [1]. However, like most wideband passive-mixer-based designs, the architecture is far less tolerant of harmonic blockers, that is blockers located at or around precise integer multiples of the LO frequency. In a typical M-phase passive mixer, shown in Fig. 3.6.1a, most out-of-band blockers are heavily attenuated by large shunt capacitors at the inputs of the baseband TIAs. Harmonic blockers are an exception and do not experience this attenuation since they are downconverted inside the TIA bandwidth, are amplified along with the wanted signal, and are only rejected by the subsequent harmonic-rejection circuitry. Since TIA gain is generally large in order to maintain a low noise figure, moderate harmonic blockers will saturate the TIAs and consequently the receiver.
Keywords :
passive networks; radio receivers; M-phase passive mixer; frequency-translational noise-cancelling receiver; harmonic blockers; harmonic-rejection circuitry; low noise figure; passive-mixer-based downconversion paths; wideband passive-mixer-based designs; Harmonic analysis; Mixers; Noise; Noise figure; Prototypes; Radio frequency; Receivers;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Solid-State Circuits Conference Digest of Technical Papers (ISSCC), 2014 IEEE International
Conference_Location :
San Francisco, CA
ISSN :
0193-6530
Print_ISBN :
978-1-4799-0918-6
Type :
conf
DOI :
10.1109/ISSCC.2014.6757341
Filename :
6757341
Link To Document :
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