Crystal oven

About: Crystal oven is a research topic. Over the lifetime, 955 publications have been published within this topic receiving 10380 citations. The topic is also known as: oven-controlled crystal oscillator & OCXO.

Means for compensating for temperature changes in piezo-electric crystal devices

Abstract: This invention relates to piezo electric crystal devices for control of oscillator frequencies, tuning circuits and kindred uses. It is well known that the oscillating frequency of the quartz crystal decreases with increase in temperature. It is also well known that the crystal oscillates...

Crystal oscillator, oscillator, electronic apparatus and radio clock

Abstract: PROBLEM TO BE SOLVED: To provide a crystal oscillator the CI value of which can be reduced, and to provide an oscillator including the crystal oscillator and having excellent reliability, an electronic apparatus and a radio clock.SOLUTION: The size of a side electrode in a thickness direction can be reduced because inclined portions 31f, 31g, inclining so that the thickness of a crystal oscillation piece 3 becomes thinner over the side faces 31c, 31d, are formed in a part of the first principal surface 31a or second principal surface 31b of the crystal oscillation piece 3 where a side electrode for interconnecting the front and rear mounting electrodes is formed. Since electric resistance value in the side electrode can be reduced, the CI value can be reduced.

A System for Frequency Measurements Based on a Single Frequency

Abstract: The method here described is suitable for calibration of either piezo oscillators or frequency meters in terms of an accurately standardized temperature controlled piezo oscillator. A radio-frequency generator is adjusted and maintained at 10 kc in terms of the standard piezo oscillator. The correct adjustment of this generator is shown by a special form of beat indicator which gives both visible and audible indication of the frequency difference between the piezo oscillator afnd a harmonic of the 10-kc generating set. A second auxiliary generator may then be set to a harmonic of the 10-kc generating set, such as some frequency assignment in the broadcasting band. The correct setting of the auxiliary generator is also determined by means of the special beat indicator. The piezo oscillator to be tested will usually be found to give an audible note in the telephone receivers connected to it. The audible note represents the difference in frequency between the piezo oscillator and the auxiliary generating set. The frequency difference is determined by comparison with a calibrated audio-frequency generator.

A simple technique for precise voltage control of oscillator frequencies

Abstract: A proportional feedback control scheme is proposed to obtain a precise linear relationship between the control voltage and the frequency of oscillators. Experimental results agree closely with the theory. The scheme is simple in circuitry, versatile, and suitable for mass production.

Method of measuring the thermal hysteresis of quartz crystal resonators

Abstract: The thermal hysteresis of quartz crystal resonators is measured by exciting two modes of a quartz crystal of interest with an external frequency source at a preselected temperature, calculating the difference frequency as between the modes, resetting to the original set temperature after temporarily altering the temperature, remeasuring the frequencies while maintaining the temperature and the difference frequency at the same respective values as the original values, and taking the mode frequency difference as representative of the thermal hysteresis of the crystal.