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Title

A 1.1 -mW-RX, -81.4 -dBm sensitivity CMOS transceiver for bluetooth low energy

AuthorsMasuch, Jens ; Delgado-Restituto, Manuel
KeywordsLow power transceiver
Bluetooth low energy
Passive receiver
Zero-IF
Direct modulation
QVCO
Magnetic coupling cancelation
Phase ADC
GFSK
Issue DateApr-2013
PublisherInstitute of Electrical and Electronics Engineers
CitationIEEE Transactions on Microwave Theory and Techniques 61(4): 1660 - 1673 (2013)
AbstractThis paper presents a fully integrated low-power 130-nm CMOS transceiver tailored to the Bluetooth low energy (BLE) standard. The receiver employs a passive front-end zero-IF architecture, which is directly driven by a quadrature voltage-controlled oscillator (QVCO) without any buffering stage. The QVCO, embedded in a fractional-N phase-locked loop (PLL), employs a passive RC network to cancel the parasitic magnetic coupling between the two cores so as to keep the quadrature phase error below 1.5°. The PLL exhibits a high loop bandwidth of 1 MHz to sufficiently reduce the frequency pulling effects due to close-by interferers. The transmitter uses a direct-modulation Gaussian frequency-shift keying scheme in which small PMOS-based cells modulate the output signal of one of the cores of the QVCO. In the baseband section, the transceiver employs a 4-bit phase-domain ADC based on novel linear-combiner topology to generate the required phase rotations. The proposed combiner operates in current domain and does not employ resistors, leading to a power- and area-efficient demodulator implementation. The complete receiver achieves a sensitivity of - 81.4 dBm and fulfills the BLE requirements on interference blocking. It consumes 1.1 mW from a 1.0-V supply and has a similar power efficiency as recent super-regenerative receivers that are much more susceptible to interferers. The transmitter delivers 1.6-dBm output power to a differential 100 Ω and consumes 5.9 mW, which implies a total efficiency of 24.5%.
URIhttp://hdl.handle.net/10261/88570
DOI10.1109/TMTT.2013.2247621
ISSN0018-9480
Appears in Collections:(IMSE-CNM) Artículos
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