Showing papers on "Crystal oven published in 1973"
Patent•
19 Mar 1973TL;DR: In this paper, an emitter coupled oscillator and automatic gain control is used to maintain the amplitude of the oscillations within a predetermined range to limit crystal drive and to provide a substantially sinusoidal output signal without additional tuned circuits.
Abstract: A crystal controlled oscillator operable over a wide frequency range includes an emitter coupled oscillator and automatic gain control to maintain the amplitude of the oscillations within a predetermined range to limit crystal drive and to provide a substantially sinusoidal output signal without additional tuned circuits
17 citations
12 Jun 1973
11 citations
Patent•
02 Jul 1973TL;DR: In this paper, a two transistor VHF crystal controlled harmonic oscillator provides a large ratio of output power to crystal unit power dissipation without significant degradation of oscillating resonator Q from the crystal unit Q defined herein as Qx.
Abstract: A two transistor VHF crystal controlled harmonic oscillator provides a large ratio of output power to crystal unit power dissipation without significant degradation of oscillating resonator Q from the crystal unit Q defined herein as Qx. A cascode amplifier configuration comprising first and second transistors in combination with inductance and capacitance elements provides an oscillator configuration with phase shift in the vicinity of the oscillator frequency dominantly controlled by the quartz crystal unit motional impedance parameters. The first and second transistors are operated under linear conditions during the complete cycle of oscillation current, and two hot carrier diodes operated with appropriate biasing voltages provides the limiting characteristic required in harmonic oscillators. Circuit applications may use one or two VHF crystal units with appropriate antiresonating of circuit capacitance to achieve a desired minimum of phase noise power spectral density in the oscillator circuit.
9 citations
TL;DR: In this article, a technique to temperature stabilize a Gunn-effect CW oscillator (C band) in microstrip, has been developed, which can be used for temperature stabilization.
Abstract: A technique to temperature stabilize a Gunn-effect CW oscillator (C band) in microstrip, has been developed.
4 citations
Patent•
14 Sep 1973TL;DR: In this article, the frequency control range of the voltage controllable crystal oscillator is less than the desired frequency by a factor of at least a desired frequency division ratio, where the output signal of the mixer and the signal from the reference oscillator are supplied to a sample and hold phase detector which supplies a control signal to the voltage controlled crystal oscillators to maintain the frequency of the desired value.
Abstract: A reference crystal oscillator and a voltage controllable crystal oscillator, having frequencies separated by a desired frequency, each supplying a signal to a mixer which provides an output signal of the desired frequency. The output signal of the mixer and the signal from the reference oscillator are supplied to a sample and hold phase detector which supplies a control signal to the voltage controllable crystal oscillator to maintain the frequency thereof the desired frequency from the frequency of the reference crystal oscillator. The frequency control range of the voltage controllable crystal oscillator is less than the desired frequency by a factor of at least the desired frequency division ratio.
3 citations
01 Apr 1973
TL;DR: In this article, the authors developed an experimental tactical miniature crystal oscillator (TMXO) in a 5 cubic inch volume, using < 10 W warmup power from -40C to +85C in 1 min, and then operate on < 250 mW.
Abstract: : TOR.Final rept. 1 Jul 71-30 Aug 72,FHart,Raymond K. ;Hicklin,Walter H. ;Phillips,Larry A. ;GIT-A-1344-FDAAB07-71-C-0301DA-1-H-662705-A-0581-H-662705-A-05803ECOM0301-FSee also report dated Aug 72, AD-749 271.(*crystal oscillators, high frequency), quartz resonators, miniature electronic equipment, field effect transistors, integrated circuits, reliability(electronics)metal oxide transistors, hybrid circuits, microminiaturizationThe purpose of this work was to develop an experimental tactical miniature crystal oscillator (TMXO) in a 5 cubic inch volume, use < 10 W warmup power from -40C to +85C in 1 min, and then operate on < 250 mW. It was to reach a maximum deviation from final frequency of plus or minus 1 X 10 to the 7th power after a 1 min period. The short term stability requirement was to have a maximum rms frequency deviation of plus or minus 1 X 10 to the -11th power for averaging times from 1 sec to 20 min.
3 citations
TL;DR: In this paper, the authors discussed the effect of frequency conversion of power from zero frequency to the oscillation frequency in the normal electronic feedback oscillator or signal generator, via the amplifier, from a DC source.
Abstract: For pt. I see ibid., vol.8, no.5, 310 (1973). An oscillating system is conventionally excited by a force at the resonant frequency. In the normal electronic feedback oscillator or signal generator this is derived, via the amplifier, from a DC source. Thus the net effect is that of frequency conversion of power from zero frequency to the oscillation frequency. For the parametric oscillators discussed the conversion is from a frequency 2 omega 0 (say) to a frequency omega 0.
TL;DR: In this article, a crystal oscillator is described, which will automatically adjust its frequency, so that the crystal unit operates at zero phase angle (i.e. resonance), whenever there is a change in the crystal parameters, or one crystal unit is replaced by another.
Abstract: A crystal oscillator is described, which will automatically adjust its frequency, so that the crystal unit operates at zero phase angle (i.e. resonance), whenever there is a change in the crystal parameters, or one crystal unit is replaced by another. The circuit is capable of this self-adjustment to within one part in ten degrees and over a frequency range of 1–200 MHz.