A crystal-controlled oscillator
Description: A series resonant circuit utilizing a crystal oscillator is illustrated. The crystal impedance reaches a minimum value at the series resonance frequency, resulting in a significant feedback amount. The crystal tuning capacitor (Cc) can slightly adjust the resonance frequency of the crystal, enabling fine-tuning of the oscillation frequency.
The series resonant circuit with a crystal oscillator is a fundamental electronic configuration used in various applications, including frequency stabilization and signal generation. In this setup, the crystal oscillator serves as a frequency-selective element, exhibiting a sharp resonance peak at its fundamental frequency. At this resonance frequency, the impedance of the crystal drops to a minimum, allowing maximum current flow and enhancing feedback within the circuit.
The circuit typically includes a resistor (R), an inductor (L), and the crystal itself, connected in series. The inductor and the crystal together form a resonant circuit, where the inductive reactance and the capacitive reactance of the crystal cancel each other out at the resonance frequency. This results in a high quality factor (Q), which is indicative of the circuit's ability to maintain oscillations with minimal energy loss.
The crystal tuning capacitor (Cc) is an essential component that allows for slight adjustments to the resonant frequency of the crystal. By changing the capacitance value of Cc, the resonant frequency can be fine-tuned either upwards or downwards, enabling the circuit to achieve precise frequency control. This micro-tuning capability is crucial in applications such as radio transmitters and receivers, where exact frequency alignment is necessary for optimal performance.
Overall, the series resonant circuit with a crystal oscillator and a tuning capacitor is a highly effective method for generating stable oscillations at a desired frequency, making it an integral part of many electronic devices. As shown in the series resonant circuit using a crystal oscillator. Crystal impedance has a minimum value in the series resonance frequency, thus providing a large feedback amo unt Sheng. Crystal tuning capacitor Cc may be the resonance frequency of the crystal slightly pull on or pull down to micro- tune the oscillation frequency.
The series resonant circuit with a crystal oscillator is a fundamental electronic configuration used in various applications, including frequency stabilization and signal generation. In this setup, the crystal oscillator serves as a frequency-selective element, exhibiting a sharp resonance peak at its fundamental frequency. At this resonance frequency, the impedance of the crystal drops to a minimum, allowing maximum current flow and enhancing feedback within the circuit.
The circuit typically includes a resistor (R), an inductor (L), and the crystal itself, connected in series. The inductor and the crystal together form a resonant circuit, where the inductive reactance and the capacitive reactance of the crystal cancel each other out at the resonance frequency. This results in a high quality factor (Q), which is indicative of the circuit's ability to maintain oscillations with minimal energy loss.
The crystal tuning capacitor (Cc) is an essential component that allows for slight adjustments to the resonant frequency of the crystal. By changing the capacitance value of Cc, the resonant frequency can be fine-tuned either upwards or downwards, enabling the circuit to achieve precise frequency control. This micro-tuning capability is crucial in applications such as radio transmitters and receivers, where exact frequency alignment is necessary for optimal performance.
Overall, the series resonant circuit with a crystal oscillator and a tuning capacitor is a highly effective method for generating stable oscillations at a desired frequency, making it an integral part of many electronic devices. As shown in the series resonant circuit using a crystal oscillator. Crystal impedance has a minimum value in the series resonance frequency, thus providing a large feedback amo unt Sheng. Crystal tuning capacitor Cc may be the resonance frequency of the crystal slightly pull on or pull down to micro- tune the oscillation frequency.
1 Second Time Base From Crystal Oscillator
The schematic below illustrates the division of a crystal oscillator signal by the crystal frequency to obtain an accurate 1-second time base with a precision of 0.01%. Two cascaded 12-stage counters (CD4040) form a 24-stage binary counter, and the appropriate...
Switchable Output Crystal Oscillator
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Several gates as a crystal oscillator circuit
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Crystal-timebase
An on-board oscillator and a 17-stage divider comprise IC1. By connecting a standard 3.58-MHz television color-burst crystal as illustrated, a precise source of 60-Hz square waves is generated at the output of IC1, pin 1. These pulses are subsequently fed...
Stable low frequency crystal oscillator
This Colpitts crystal oscillator is ideal for low-frequency crystal oscillator circuits. Excellent stability is assured because the 2N3823 JFET circuit loading does not vary with temperature.
The Colpitts crystal oscillator is a type of electronic oscillator that utilizes a combination of...
Collection of Crystal Oscillators
On following pages circuits are shown for 3rd overtone crystals 15 to 65MHz and 5th overtone crystals 60 to 105 MHz operating in their series resonant mode. In both of these circuits with the crystal short circuited, the oscillator should...
Crystal oscillator
International Crystal OF-1 LO oscillator circuit for fundamental-mode crystals that you can find.
The International Crystal OF-1 local oscillator (LO) circuit is designed to operate with fundamental-mode crystals, which are widely used in various frequency generation applications. This oscillator circuit typically...
96Mhz crystal oscillator
A stable variable crystal oscillator (VXO) utilizing 6- or 8-MHz crystals employs a capacitor and an inductor to facilitate frequency pulling on either side of series resonance.
The described circuit operates as a variable crystal oscillator, which is crucial in applications...
A Low-Frequency Crystal Controlled Oscillator
The RF engineer occasionally needs to find an instrument that can reliably and quickly test a low-frequency quartz crystal unit. This equipment is often challenging to locate, leading engineers to consult electronic circuits handbooks for schematics that can perform the...