FSK Coherent Demodulation Using Second- Harmonic Injection Locked Oscillator

We present an alternative coherent demodulation of frequency shift keying (FSK) signals based on the use of a super harmonic injection locked oscillator (ILO). Demodulation consists of multiplying the incoming FSK signal by the output of the ILO using an up-conversion mixer. The product includes a s...

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Bibliographic Details
Published in:IEEE microwave and wireless components letters 2009-09, Vol.19 (9), p.578-580
Main Authors: Vidal, N., Macias-Montero, J.G., Lopez-Villegas, J.M.
Format: Article
Language:English
Subjects:
Analog circuits
Applied sciences
Circuit properties
Circuit testing
Coherence
Demodulation
Digital circuits
Diodes
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Feedback loop
Frequency shift keying
Frequency shift keying (FSK) demodulator
Frequency synchronization
Harmonics
injection locked oscillators (ILOs)
Injection-locked oscillators
Locks
Mixers
Modulation
Oscillators
Oscillators, resonators, synthetizers
Prototypes
Signal convertors
synchronization
System testing
Tuning
Varactors
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Summary:We present an alternative coherent demodulation of frequency shift keying (FSK) signals based on the use of a super harmonic injection locked oscillator (ILO). Demodulation consists of multiplying the incoming FSK signal by the output of the ILO using an up-conversion mixer. The product includes a second harmonic signal that locks the oscillator, closing a non-linear feedback loop, and synchronizes its output with the incoming FSK signal. In addition to the second harmonic, the product also includes a base band signal that reproduces the original modulation. We built and tested a hybrid prototype of the demodulation system for the frequency range from 250 to 300 MHz. The circuit consists of a second-harmonic differential output ILO with varactor diodes as tuning elements and a four quadrant analog multiplier. Our results demonstrate the reliability and robustness of the demodulator system.
ISSN:1531-1309
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2009.2027090