A Dual-Mode Bluetooth Transceiver with a Two-Point-Modulated Polar-Loop Transmitter and a Frequency-Offset-Compensated Receiver

Takashi OSHIMA  Masaru KOKUBO  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E90-A   No.8   pp.1669-1678
Publication Date: 2007/08/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e90-a.8.1669
Print ISSN: 0916-8508
Type of Manuscript: PAPER
Category: Circuit Theory
Keyword: 
dual-mode Bluetooth,  GFSK,  π/4-DQPSK,  polar loop,  two-point modulation,  DC-DC converter,  power efficiency,  delay detector,  frequency offset,  

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Summary: 
An entire dual-mode transceiver capable of both the conventional GFSK-modulated Bluetooth and the Medium-Rate π/4-DQPSK-modulated Bluetooth has been investigated and reported. The transmitter introduces a novel two-point-modulated polar-loop technique without the global feedback to realize reduced power consumption, small chip area and also high modulation accuracy. The receiver shares all the circuits for both operating modes except the demodulators and also features a newly-proposed cancellation technique of the carrier-frequency offset. The transceiver has been confirmed by system or circuit simulations to meet all the dual-mode Bluetooth specifications. The simulation results show that the transmitting power can be larger than 10 dBm while achieving the total power efficiency above 30% and also RMS DEVM of 0.050. It was also confirmed by simulation that the receiver is expected to attain the sensitivity of -85 dBm in both modes while satisfying the image-rejection and the blocker-suppression specifications. The proposed transceiver will provide a low-cost, low-power single-chip RF-IC solution for the next-generation Bluetooth communication.