Turkish Journal of Electrical Engineering and Computer Sciences
Abstract
Unlike conventional analog-to-digital converter (ADC), phase-domain ADC (Ph-ADC) is more power efficient for the implementation of fully digital Gaussian frequency shift keying (GFSK) demodulator in bluetooth low energy (BLE). Besides, Ph-ADC based demodulator is flexible to pair with low-IF and zero-IF receiver, opposed to limiter based demodulator that work with low-IF receiver only. Yet, currently reported Ph-ADC based demodulator lack of preamble detection for BLE which will be used as symbol clock synchronization. In this work, a Ph-ADC based demodulator is proposed with the feature of preamble detection on BLE's packet. The detected preamble is used for symbol clock recovery and compensation of carrier frequency offset in a BLE packet. Besides, the proposed demodulator is flexible to demodulate IF or baseband signal by simply configuring a parameter value. Using MATLAB, minimum signal-to-noise Ratio (SNR) needed to demodulate BLE packet is estimated using Monte Carlo simulation with 99$\%$ confidence level. For hardware implementation, the proposed demodulator is implemented at RTL in Synopsys and its layout is generated using 0.18 $\mu m$ CMOS technology. To understand the trade-off between power consumption, layout size and minimum SNR needed, the proposed Ph-ADC based demodulator is scaled to a different combination of 4-bit to 6-bit resolution and 2 MHz to 16 MHz sampling rate. Configuration with the best trade-off for the proposed Ph-ADC demodulator can achieve bit error rate ($BER$) of 0.1$\%$ at SNR of 12.5 dB and able to tolerate carrier frequency offset of $\pm$ 200 kHz while using only half the power needed by state of the art limiter based demodulator.
DOI
10.3906/elk-1912-155
Keywords
Bluetooth, BLE, GFSK, demodulator
First Page
2183
Last Page
2199
Recommended Citation
UNG, SHEN JIE and RAHMAN, AB AL-HADI AB
(2020)
"A 88 $\mu W$ digital phase-domain GFSK demodulator compatible with low-IF and zero-IF receiver with preamble detection for BLE,"
Turkish Journal of Electrical Engineering and Computer Sciences: Vol. 28:
No.
4, Article 26.
https://doi.org/10.3906/elk-1912-155
Available at:
https://journals.tubitak.gov.tr/elektrik/vol28/iss4/26
Included in
Computer Engineering Commons, Computer Sciences Commons, Electrical and Computer Engineering Commons