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A 170-μA All-Digital GFSK Demodulator with Rejection of Low SNR Packets for Bluetooth-LE

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

IEEE Microwave and Wireless Components Letters Vol. 26, Nº 6, pp. 452 - 454, June, 2016.

ISSN (print): 1531-1309
ISSN (online): 1531-1309

Journal Impact Factor: 1,703 (in 2014)

Digital Object Identifier: 10.1109/LMWC.2016.2562639

Abstract
This paper presents an all-digital low-IF Gaussian Frequency-Shift Keying (GFSK) demodulator. The demodulator is based on a quadrature FM discriminator followed by a bit decision unit. An intermediate-frequency (IF) input signal of 1 MHz is used, the same value of the data rate, hence allowing a low-power receiver implementation. By monitoring the SNR of the input packet during the preamble, poor SNR packets are discarded to avoid energy waste with non-decodable packets. The circuit occupies a silicon area of 0.048 mm2 in a 130 nm process. Measurements show a
state-of-the-art current consumption of about 170 μA from a single 1.2 V supply. The proposed demodulator requires an SNR of 14.4 dB for a BER of 0.1%.