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Crystal oscillators can be manufactured for oscillation over a wide range of frequencies, from a few kilohertz up to several hundred megahertz.Many applications call for a crystal oscillator frequency conveniently related to some other desired frequency, so hundreds of standard crystal frequencies are made in large quantities and stocked by electronics distributors.
A crystal oscillator is an electronic oscillator circuit that uses a piezoelectric crystal as a frequency-selective element. [1] [2] [3] The oscillator frequency is often used to keep track of time, as in quartz wristwatches, to provide a stable clock signal for digital integrated circuits, and to stabilize frequencies for radio transmitters and receivers.
Single transistor emitter-follower circuit. The Butler oscillator is a crystal-controlled oscillator that uses the crystal near its series resonance point. They are used where a simple low-cost circuit is needed which can oscillate at high frquencies (>50MHz [1]) by using overtones of a crystal, and also giving low phase noise.
A crystal radio can be thought of as a radio receiver reduced to its essentials. [3] [39] It consists of at least these components: [22] [40] [41] An antenna in which electric currents are induced by radio waves. A resonant circuit (tuned circuit) which selects the frequency of the desired radio station from all the radio signals received by ...
Up to 25 MHz (40 MHz b/w cards limited by GigE interface) [125] 14 16 Yes 25 Msps for 16-bit samples; 50 Msps for 8-bit samples 0.5 ppm TCXO. 0.01 ppm w/ GPSDO Option Gigabit Ethernet Yes Yes Yes Xilinx Spartan 3A-DSP 1800 USRP N210 [126] Pre-built DC – 6 GHz Up to 25 MHz (40 MHz b/w cards limited by GigE interface) [125] 14 16 Yes
The crystal planes and tuning of consumer-grade clock crystal resonators used in wristwatches are designed for minimal temperature sensitivity to frequency and operate best at a temperature range of about 25 to 28 °C (77 to 82 °F).
A ceramic resonator is often used in place of quartz crystals as a reference clock or signal generator in electronic circuitry due to its low cost and smaller size. The lower Q and higher frequency range achievable can be beneficial in use of TCXOs, temperature-compensated crystal oscillators. The frequency of the oscillator can be "pulled" in ...
The total capacitance seen from the crystal looking into the rest of the circuit is called the "load capacitance". When a manufacturer makes a "parallel" crystal, a technician uses a Pierce oscillator with a particular fixed load capacitance (often 18 or 20 pF) while trimming the crystal to oscillate at exactly the frequency written on its package.
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