IEICE TRANSACTIONS on Electronics
A GFSK Transmitter Architecture for a Bluetooth RF-IC, Featuring a Variable-Loop-Bandwidth Phase-Locked Loop Modulator
Summary :
The use of a two-point modulator with variable PLL loop bandwidth as a GFSK signal generator is proposed. Delta-sigma modulation is adopted for the modulator. Through the combination of a variable PLL feedback loop and delta-sigma modulation, both a fast settling time and very clear eye opening are achieved for the modulator. We fabricate it in 0.35-µm BiCMOS process technology. The two-point modulator has a center-frequency drift of only 14.9 kHz, much lower than the 178-kHz result for a single time slot in the case of direct VCO modulation. This is due to the PLL feedback loop. Evaluation also confirmed that the circuit satisfies the various characteristics required of a Bluetooth transmitter. The two-point modulator is also applicable to other transceivers which use FSK or PSK modulation, i.e. forms of modulation where a constant signal level is transmitted, and thus contributes to the simplification of a range of wireless transmitters.
- Publication
- IEICE TRANSACTIONS on Electronics Vol.E88-C No.3 pp.385-394
- Publication Date
- 2005/03/01
- Publicized
- Online ISSN
- DOI
- 10.1093/ietele/e88-c.3.385
- Type of Manuscript
- PAPER
- Category
- Microwaves, Millimeter-Waves
Authors
Keyword
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Masaru KOKUBO, Takashi OSHIMA, Katsumi YAMAMOTO, Kunio TAKAYASU, Yoshiyuki EZUMI, Shinya AIZAWA, "A GFSK Transmitter Architecture for a Bluetooth RF-IC, Featuring a Variable-Loop-Bandwidth Phase-Locked Loop Modulator" in IEICE TRANSACTIONS on Electronics,
vol. E88-C, no. 3, pp. 385-394, March 2005, doi: 10.1093/ietele/e88-c.3.385.
Abstract: The use of a two-point modulator with variable PLL loop bandwidth as a GFSK signal generator is proposed. Delta-sigma modulation is adopted for the modulator. Through the combination of a variable PLL feedback loop and delta-sigma modulation, both a fast settling time and very clear eye opening are achieved for the modulator. We fabricate it in 0.35-µm BiCMOS process technology. The two-point modulator has a center-frequency drift of only 14.9 kHz, much lower than the 178-kHz result for a single time slot in the case of direct VCO modulation. This is due to the PLL feedback loop. Evaluation also confirmed that the circuit satisfies the various characteristics required of a Bluetooth transmitter. The two-point modulator is also applicable to other transceivers which use FSK or PSK modulation, i.e. forms of modulation where a constant signal level is transmitted, and thus contributes to the simplification of a range of wireless transmitters.
URL: https://global.ieice.org/en_transactions/electronics/10.1093/ietele/e88-c.3.385/_p
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@ARTICLE{e88-c_3_385,
author={Masaru KOKUBO, Takashi OSHIMA, Katsumi YAMAMOTO, Kunio TAKAYASU, Yoshiyuki EZUMI, Shinya AIZAWA, },
journal={IEICE TRANSACTIONS on Electronics},
title={A GFSK Transmitter Architecture for a Bluetooth RF-IC, Featuring a Variable-Loop-Bandwidth Phase-Locked Loop Modulator},
year={2005},
volume={E88-C},
number={3},
pages={385-394},
abstract={The use of a two-point modulator with variable PLL loop bandwidth as a GFSK signal generator is proposed. Delta-sigma modulation is adopted for the modulator. Through the combination of a variable PLL feedback loop and delta-sigma modulation, both a fast settling time and very clear eye opening are achieved for the modulator. We fabricate it in 0.35-µm BiCMOS process technology. The two-point modulator has a center-frequency drift of only 14.9 kHz, much lower than the 178-kHz result for a single time slot in the case of direct VCO modulation. This is due to the PLL feedback loop. Evaluation also confirmed that the circuit satisfies the various characteristics required of a Bluetooth transmitter. The two-point modulator is also applicable to other transceivers which use FSK or PSK modulation, i.e. forms of modulation where a constant signal level is transmitted, and thus contributes to the simplification of a range of wireless transmitters.},
keywords={},
doi={10.1093/ietele/e88-c.3.385},
ISSN={},
month={March},}
Copy
TY - JOUR
TI - A GFSK Transmitter Architecture for a Bluetooth RF-IC, Featuring a Variable-Loop-Bandwidth Phase-Locked Loop Modulator
T2 - IEICE TRANSACTIONS on Electronics
SP - 385
EP - 394
AU - Masaru KOKUBO
AU - Takashi OSHIMA
AU - Katsumi YAMAMOTO
AU - Kunio TAKAYASU
AU - Yoshiyuki EZUMI
AU - Shinya AIZAWA
PY - 2005
DO - 10.1093/ietele/e88-c.3.385
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E88-C
IS - 3
JA - IEICE TRANSACTIONS on Electronics
Y1 - March 2005
AB - The use of a two-point modulator with variable PLL loop bandwidth as a GFSK signal generator is proposed. Delta-sigma modulation is adopted for the modulator. Through the combination of a variable PLL feedback loop and delta-sigma modulation, both a fast settling time and very clear eye opening are achieved for the modulator. We fabricate it in 0.35-µm BiCMOS process technology. The two-point modulator has a center-frequency drift of only 14.9 kHz, much lower than the 178-kHz result for a single time slot in the case of direct VCO modulation. This is due to the PLL feedback loop. Evaluation also confirmed that the circuit satisfies the various characteristics required of a Bluetooth transmitter. The two-point modulator is also applicable to other transceivers which use FSK or PSK modulation, i.e. forms of modulation where a constant signal level is transmitted, and thus contributes to the simplification of a range of wireless transmitters.
ER -
English
