Title :
Simple polar-loop transmitter for dual-mode Bluetooth
Author :
Oshima, Takashi ; Kokubo, Masaru
Author_Institution :
Central Res. Lab., Hitachi Ltd., Tokyo, Japan
Abstract :
A dual-mode transmitter for conventional GFSK-modulated Bluetooth and medium-rate π/4-DQPSK-modulated Bluetooth has been realized using a simple polar-loop method without feedback control from the output of the power amplifier. Phase modulation is performed by two-point modulation with extremely wide bandwidth, and fast power-efficient amplitude modulation utilizes a PWM DC-DC converter which controls the supply voltage of a class-E saturated power amplifier. The simulation has confirmed an output power above 10 dBm, a total power efficiency above 30% and RMS DEVM of 0.050. The proposed transmitter enables a low-cost, low-power single-chip RF-IC for the next-generation Bluetooth communication.
Keywords :
Bluetooth; DC-DC power convertors; PWM power convertors; UHF integrated circuits; UHF power amplifiers; frequency shift keying; low-power electronics; quadrature phase shift keying; radio transmitters; 2.4 GHz; 30 percent; CMOS; DEVM; GFSK; PWM DC-DC converter; RFIC; class-E saturated power amplifier; dual-mode Bluetooth; low-cost low-power transmitter; medium-rate π/4-DQPSK-modulation; phase modulation; polar-loop transmitter; power efficiency; power-efficient amplitude modulation; wide bandwidth two-point modulation; Amplitude modulation; Bandwidth; Bluetooth; DC-DC power converters; Feedback control; Phase modulation; Power amplifiers; Pulse width modulation; Pulse width modulation converters; Transmitters;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1465499
