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An Ultra-Low Power Low-IF GFSK Demodulator for Bluetooth-LE applications

Pereira, M. ; Vaz, J. ; Leme, C.A. ; Sousa, J. T. ; Costa Freire, J.

An Ultra-Low Power Low-IF GFSK Demodulator for Bluetooth-LE applications , Proc IEEE International Symp. on Circuits and Systems - ISCAS, Lisbon, Portugal, Vol. 1, pp. 1226 - 1229, May, 2015.

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Abstract
This paper presents a digital low-IF Gaussian frequency-shift keying (GFSK) demodulator. The demodulator is based on a phase-shift quadrature discriminator. However, a preamble detector and a central control block improve significantly the demodulator total power consumption. An IF input signal of 1 MHz is used, the same of the data rate, hence, allowing a low-power receiver implementation. A digital implementation in a 130 nm process allowed a low silicon area of 0.06mm2. Simulations show a state-of-art current consumption of about 143 µA from a single 1.2 V supply voltage. The proposed demodulator requires a SNR of 15dB for a BER of 0.1% for up to ±200 kHz frequency offset variation.