DocumentCode :
3697944
Title :
A wideband under-sampling blocker detector with a 0.7–2.7 GHz mixer-first receiver
Author :
Olli Viitala;Mikko Kaltiokallio;Marko Kosunen;Kari Stadius;Jussi Ryynänen
Author_Institution :
Department of Micro and Nanosciences, Aalto University, Finland
fYear :
2015
fDate :
5/1/2015 12:00:00 AM
Firstpage :
335
Lastpage :
338
Abstract :
This paper presents a low power wideband blocker detector consisting of an under-sampling SAR ADC connected to the RF input node of a wideband mixer-first receiver. The original carrier frequency of the blocker is determined from folded spectra by using three FFTs sampled at different rates whose ratios correspond to prime numbers. The detector is targeted for blocker power levels between 0 and −30 dBm within frequency range of 0.7–2.7 GHz. The achieved ADC maximum SNDR of 28 dB, together with 10 dB input buffer gain control, provide sufficient blocker detection sensitivity in the desired range. The measured sampled input signal spectra show the designed circuits capability to simultaneously detect narrowband and wideband blockers. The reconstructed folded spectrum shows the original blocker frequencies. The power consumption of the wideband detector is only 7 mW, while the receiver consumes 42 mW.
Keywords :
"Receivers","Detectors","Wideband","Mixers","Frequency measurement","Radio frequency"
Publisher :
ieee
Conference_Titel :
Radio Frequency Integrated Circuits Symposium (RFIC), 2015 IEEE
Type :
conf
DOI :
10.1109/RFIC.2015.7337773
Filename :
7337773
Link To Document :
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