Injection-Locked-Oscillator FM Receiver Analysis

Ruthroff, C. L.

doi:10.1002/j.1538-7305.1968.tb00096.x

Cited by 20 publications

(1 citation statement)

References 11 publications

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“…An analytical treatment of noise in injection-locked FM receivers is presented in [5]. It is important to note that while the locked oscillator reduces FM deviation by virtue of division, the modulation frequency remains unaltered [5].…”

Section: Locked-in Deviation Division and Fm Demodulationmentioning

confidence: 99%

An FM demodulator operating across 2–10GHz IF

Visweswaran

Long

Galatro

et al. 2013

2013 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)

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An FM demodulator operating across 8GHz IF bandwidth for application in low-power, wideband heterodyne receivers is presented. A 4-stage ring oscillator is frequency modulated by a wideband input. Locking to 1/4 th the input frequency, it divides the FM deviation by four, thereby reducing the energy required for wideband demodulation to 0.75nJ/bit. Autocorrelation of the quadrature-phased outputs using a new low-power folded CMOS mixer is capable of detecting FM up to 400Mb/s over 2-10GHz IF. The inductorless 65nm CMOS prototype circuit occupies 0.17mm 2 and dissipates 3mW from 1.2V.

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Section: Locked-in Deviation Division and Fm Demodulationmentioning

confidence: 99%

An FM demodulator operating across 2–10GHz IF

Visweswaran

Long

Galatro

et al. 2013

2013 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)

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Injection locking of a double‐mode oscillator with fundamental and third harmonic resonators

Umeda¹,

Hayashi²,

Kitagawa³

et al. 1986

Electron. Comm. Jpn. Pt. I

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The injection locking of the solid‐state oscillator has been studied from the viewpoint of various applications such as modulation, detection, regeneration and amplification of signal in communication systems. The injection locking oscillation with harmonics exhibits various peculiar phenomena which are not observed in the single‐mode oscillator with single resonant circuit. This paper discusses the double‐mode oscillator composed of fundamental and third harmonic oscillations. The major results are as follows: (1) The effective increase of the Q value for the fundamental frequency due to the presence of the third harmonic is evaluated in terms of the effective external Q; (2) It is shown that the locking equation for the phase in the simultaneous oscillation of fundamental and third harmonic frequencies, is of the same expression as that of the basic equation second‐order loop (with imperfect integrator) in the phase‐locked loop (PLL). The equivalent loop gain is defined from such a viewpoint; (3) There exists a jumping phenomenon in the oscillator output, when the frequency of the injection signal is varied. This is the result of a sudden change of the injected signal frequency affecting the amplitude to an on‐off behavior. This property can be applied to the detection of FSK signal. These results of analysis were compared with the experiment, and satisfactory agreement was obtained.

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Digital Phase Demodulator

Glance¹

1971

Bell System Technical Journal

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Injection‐locked oscillators are shown to act as narrow‐band tunable fillers for FM signals if the modulation rate is much larger than the locking bandwidth. The filtering action of the injection‐locked oscillator for FM signals is found analogous to that of a high Q passive cavity. The effective Q of the injection‐locked oscillator can be as high as 105 if the stability of the injected signal carrier and oscillator frequencies is better than 106. These filtering properties can be applied to a digital demodulator for coherent phase detection of a coded FM signal. The local source which is required for coherent phase detection is provided by using a fraction of the received signal to lock an oscillator. Sideband suppression and carrier amplification of the injected signal are achieved simultaneously by using the filtering action of the injection‐locked oscillator. The simplicity of this digital demodulator makes it appear useful for repeaters in microwave radio relays.

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Injection-Locked-Oscillator FM Receiver Analysis

Cited by 20 publications

References 11 publications

An FM demodulator operating across 2–10GHz IF

An FM demodulator operating across 2–10GHz IF

Injection locking of a double‐mode oscillator with fundamental and third harmonic resonators

Digital Phase Demodulator

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Injection-Locked-Oscillator FM Receiver Analysis

Cited by 20 publications

References 11 publications

An FM demodulator operating across 2&#x2013;10GHz IF

An FM demodulator operating across 2&#x2013;10GHz IF

Injection locking of a double‐mode oscillator with fundamental and third harmonic resonators

Digital Phase Demodulator

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Product

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An FM demodulator operating across 2–10GHz IF

An FM demodulator operating across 2–10GHz IF