Topic
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.
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TL;DR: In this paper, three types of HF and VHF crystal controlled transistor oscillators are experimentally studied to assess their frequency shift bandwidth and stability properties, and the capacitance bridge oscillator exhibits a bandwidth under certain circuit conditions of 0.1 per cent of center frequency, with amplitude modulation of 1 db, but degraded frequency stability.
Abstract: Three types of HF and VHF crystal controlled transistor oscillators are experimentally studied to assess their frequency shift bandwidth and stability properties. The capacitance bridge oscillator exhibits a bandwidth under certain circuit conditions of 0.1 per cent of center frequency, with amplitude modulation of 1 db, but degraded frequency stability. Combining this oscillator with another exhibiting superior stability in the low VHF band results in a hybrid oscillator circuit in which frequency can be shifted 0.02 percent with good power regulation. Frequency stability is 0.46 ppm/ \degC and 3 ppm/10 per cent change in supply voltage. Most of the experiments were conducted at 35 Mc, but higher order modes to 150 Mc were also investigated.
2 citations
Patent•
04 Sep 2013TL;DR: In this article, a sensor for sensing of substances is presented, which can include a sensing crystal oscillator and a reference crystal oscillators, arranged in a phase locked loop so that the oscillators oscillate at a common frequency.
Abstract: There is set forth herein a sensor for sensing of substances. The sensor can include a sensing crystal oscillator and a reference crystal oscillator. The sensing crystal oscillator and the reference crystal oscillator can be arranged in a phase locked loop so that the oscillators oscillate at a common frequency. The sensor can be configured so that there is a baseline phase differential between the oscillation frequencies of the sensing crystal oscillator and the reference crystal oscillator. Detectable substances accumulating on the sensing crystal oscillator will induce a phase shift between output frequencies of the reference oscillator and the sensing crystal oscillator to allow for highly sensitive sensing of substances in small concentrations.
2 citations
TL;DR: In this article, the Pound-Drever-Hall method was used to stabilize a voltage controlled oscillator to a cavity resonance at 800 MHz using radio-frequency electronics, which is commonly applied to stabilize lasers at optical frequencies.
Abstract: We have developed a senior undergraduate experiment that illustrates frequency stabilization techniques using radio-frequency electronics. The primary objective is to frequency stabilize a voltage controlled oscillator to a cavity resonance at 800 MHz using the Pound-Drever-Hall method. This technique is commonly applied to stabilize lasers at optical frequencies. By using only radio-frequency equipment it is possible to systematically study aspects of the technique more thoroughly, inexpensively, and free from eye hazards. Students also learn about modular radio-frequency electronics and basic feedback control loops. By varying the temperature of the resonator, students can determine the thermal expansion coefficients of copper, aluminum, and super invar.
2 citations
12 May 1959
2 citations