Showing papers on "Injection locking published in 1974"
TL;DR: In this paper, the locking equation for single-stage LC injection-locked oscillators is derived for subharmonic, fundamental, and harmonic locking, the dc transfer characteristic of a nonlinear device being approximated, at the dc operating point, by a third-order polynomial.
Abstract: By combining the instantaneous phase shift of a twosinusoid-input describing function with a phase response of the tuned circuit it has been possible to develop the locking equation for single-stage LC injection-locked oscillators ILO. The locking range as well as steady-state phase shift of an ILO are calculated for subharmonic, fundamental, and harmonic locking, the dc transfer characteristic of a nonlinear device being approximated, at the dc operating point, by a third-order polynomial. The phase plane representation is included. Experimental results are given to support some of the theoretical relations derived.
21 citations
TL;DR: In this article, a pointcontact junction mounted in a coaxial resonator and biased onto the cavity-induced step in its V-I curve was used to produce Josephson oscillations near 9 GHz.
Abstract: Josephson oscillations near 9 GHz, produced by a point‐contact junction mounted in a coaxial resonator and biased onto the cavity‐induced step in its V‐I curve, have been pulled in frequency and phase locked by a weak injected signal at a nearby frequency. The resulting output was at the signal frequency and had the narrow bandwidth and frequency stability of the input but the power level of the Josephson oscillations. Maximum gain of 51 dB was achieved for an input of 10−16 W.
11 citations
8 citations
01 Oct 1974
TL;DR: In this article, the authors extended the applicability of the theory of injection locking to the out-of-lock regime where a spectrum of output frequencies is observed, and the theoretical output power spectrum was obtained by solving a differential equation having the same form as the equation describing the resistively shunted junction model.
Abstract: Previous experiments have shown that a Josephson oscillator, exposed to a weak narrow-band input signal, exhibits behavior characteristic of an injection-locked oscillator. When in lock, Adler's theory of injection locking describes the experimental observations reasonably well. This paper extends the range of applicability of the theory to the out-of-lock regime where a spectrum of output frequencies is observed. Obtaining the theoretical output power spectrum requires solving a differential equation having the same form as the equation describing the resistively shunted junction model of Stewart and of McCumber. Experimental measurements of the output spectrum of a nearly locked Josephson oscillator are shown to be in reasonable agreement with the theory. Additional results discussed briefly include the observation of a frequency dependence of the locked Josephson oscillator output, and experiments in which a Josephson oscillator-mixer was injection locked by a weak signal at the if.
5 citations
12 Jun 1974
TL;DR: In this paper, a method for the measurement of the dynamic admittance and susceptance of "negative-resistance" diodes is described, where the device under test is allowed to oscillate in a microwave cavity, and operated as an injection-locked oscillator.
Abstract: A method for the measurement of the dynamic admittance and susceptance of "negative-resistance" diodes is described. The device under test is allowed to oscillate in a microwave cavity, and operated as an injection-locked oscillator. Injected locking signals of the same order as the free-running output power of the oscillator are used. The dynamic conductance and susceptance of the device are obtained from the phase and amplitude response of the system.
5 citations
TL;DR: In this article, the second-order injection-synchronized oscillator (SOISO) was compared with a conventional type of synchronized oscillator and the superiority of the SOISO over the ISO in this respect was theoretically established and checked with experimental results.
Abstract: The response of a new type of injection-synchronized oscillator, called a second-order injection-synchronized oscillator (SOISO), to a signal contaminated with an interfering tone has been studied and compared with that of a conventional type of synchronized oscillator (ISO). The superiority of the SOISO over the ISO in this respect has been theoretically established and checked with experimental results.
3 citations
01 Oct 1974
TL;DR: In this paper, the phase transients of the Gunn oscillators have been studied with the help of Lissajous figures on a fast sampling oscilloscope, and the results show that they exhibit a complex oscillatory behaviour which only reaches a steady state after a considerable time.
Abstract: Using specially selected phase-locking systems, the phase transients of Gunn oscillators have been studied with the help of Lissajous figures on a fast sampling oscilloscope. The results show that phase transients can exhibit a complex oscillatory behaviour which only reaches a steady state after a considerable time. Theoretical results based on a phase plane analysis for the dynamic behaviour of phase and amplitude transients for injection locking confirm these experimental observations. Criteria are presented regarding optimum conditions for fast phase switching as employed for such applications as phase-shift-keyed P.C.M. systems.
2 citations
1 citations