FSK Coherent Demodulation Using Second-Harmonic Injection Locked Oscillator

被引：9
|
作者：
Lopez-Villegas, J. M. [1 ]
Vidal, N. [1 ]
Macias-Montero, J. G. [1 ]
机构：
[1] Univ Barcelona, Dept Elect, RF Grp, E-08028 Barcelona, Spain
来源：
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS | 2009年 / 19卷 / 09期
关键词：
Frequency shift keying (FSK) demodulator; injection locked oscillators (ILOs); synchronization; BPSK;
D O I：
10.1109/LMWC.2009.2027090
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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.
引用
收藏
页码：578 / 580
页数：3
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