Contents
What is shunt capacitance in crystal?
Shunt capacitance. C0 [pF] The capacitance in parallel arm of the equivalent circuit. It represents the resonator as a capacitor at frequencies outside the resonance.
What is Xtal and Extal?
EXTAL and XTAL — Clock/Crystal Source Pins EXTAL is the external clock input or the input to the crystal oscillator amplifier. XTAL is the output of the crystal oscillator amplifier. All the MCU internal system clocks are derived from the EXTAL input frequency.
Why quartz is used in crystal oscillator?
The result is that a quartz crystal behaves like an RLC circuit, composed of an inductor, capacitor and resistor, with a precise resonant frequency. Quartz has the further advantage that its elastic constants and its size change in such a way that the frequency dependence on temperature can be very low.
What is load capacitance of crystal?
Load capacitance is the amount of external circuit capacitance in parallel with the crystal itself. When specifying a series-resonant crystal, you can ignore load capacitance. This is true because the crystal’s motional inductance and motional capacitance are the only LC components that determine oscillation frequency.
Why capacitor is used in crystal oscillator?
The capacitors are there to resonate with the crystal inductance and cause the crystal to oscillate on its fundamental parallel-resonant mode. The capacitors are there to resonate with the crystal inductance and cause the crystal to oscillate on its fundamental parallel-resonant mode.
What is the frequency range of crystal oscillator?
Typical crystal oscillators can range in oscillation frequencies from about 40kHz to well over 100MHz depending upon their circuit configuration and the amplifying device used.
What should series resistance be for quartz crystal?
Oscillator circuits can tolerate some degree of series resistance, but not too much. A typical range is 25Ω to 100Ω for most crystals. The crystal vendor usually characterizes this resistance and specifies typical or maximum values for series resistance.
Can a series resonant Crystal ignore load capacitance?
Your oscillator should fall within the crystal vendor’s acceptable range of load capacitance. With a series-resonant crystal, you can ignore the load capacitance specification. This is true because the crystal’s motional inductance and motional capacitance are the only LC components that determine oscillation frequency.
How is power dissipated from a crystal determined?
Power dissipated is the product of crystal current squared times crystal series resistance. For a parallel-resonant oscillator, the crystal current equals the RMS voltage across the load capacitor divided by the load capacitor’s reactance at the oscillator frequency.
Who is the crystal of truth controlled by?
Another world, another time, another age. The Crystal of Truth, heart of the planet Thra, is controlled by the cruel and cunning Skeksis who use its power to bend the planet’s will and subjugate The Gelfling: the gentle and kind creatures who will start the Age of Resistance and thwart their masters’ schemes. Written by Johnny