A mixed-signal GFSK demodulator based on multi-threshold linear phase quantization
An ultralow-power Gaussian frequency-shift keying (GFSK) demodulator with large tolerance for process variations and wide coverage of data rate for low-intermediate-frequency (low-IF) wireless receivers is p...
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| Main Authors: | , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2010
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/91625 http://hdl.handle.net/10220/6236 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | An ultralow-power Gaussian frequency-shift keying
(GFSK) demodulator with large tolerance for process variations
and wide coverage of data rate for low-intermediate-frequency
(low-IF) wireless receivers is presented. A novel multithreshold
linear phase quantization technique is proposed to improve the
demodulator sensitivity and relax the tradeoff between the selection
of the IF and the data rate. A dynamic threshold slicer is
employed to efficiently overcome the dc drifts caused by the input
frequency offset. The demodulator achieves 490-mV input dc offset
cancellation, 800-kHz frequency offset tolerance, and data rate
coverage from 100 kb/s to 2 Mb/s. The measured signal-to-noise
ratio (SNR) is 16.0 dB for a 0.1% bit error rate (BER) and a
0.25 modulation index. The demodulator has been fabricated in a
0.18-μm complimentary metal–oxide–semiconductor process with
only 0.14-mm2 active area and 450-μA current drawn from a
1.8-V power supply. |
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