An FSK demodulator for Bluetooth applications having no external components

An injection-locked oscillator in combination with a phase detector is shown to make a very effective frequency-shift keying (FSK) demodulator for Bluetooth applications. The dynamic behavior allows automatic tuning from outside the locking range. Two tuning methods are described which eliminate the...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. 2, Analog and digital signal processing Analog and digital signal processing, 2002-06, Vol.49 (6), p.373-378
Main Authors: Main, E., Coffing, D.
Format: Article
Language:English
Subjects:
BiCMOS integrated circuits
Bluetooth
Demodulation
Filtering
Frequency shift keying
Injection-locked oscillators
Phase detection
Phase frequency detector
Tuning
Voltage
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Summary:An injection-locked oscillator in combination with a phase detector is shown to make a very effective frequency-shift keying (FSK) demodulator for Bluetooth applications. The dynamic behavior allows automatic tuning from outside the locking range. Two tuning methods are described which eliminate the need for external components, allow fast tuning and can handle low-frequency data. A cancellation technique is used which minimizes filtering requirements. The demodulator was fabricated in a bi-complementary metal-oxide-semiconductor (BiCMOS) technology with L/sub eff/ = 0.25 /spl mu/m. The die area was 0.09 mm/sup 2/ and the current consumption was 0.8 mA with a supply voltage of 2.8 V.
ISSN:1057-7130
1558-125X
DOI:10.1109/TCSII.2002.803467