CITIZEN FINETECH MIYOTA CO.,LTD.
CITIZEN Micro HumanTech
Products
HOME > Products > Quartz Crystal / Oscillator > Equivalent circuit of quartz crystal

Quartz Crystal / Oscillator

Equivalent circuit of quartz crystal

A quartz crystal unit in the main resonance frequency, may be expressed as an electrical equivalent circuit-a circuit ordinarily composed of a series circuit consisting of an inductance, capacitance and resistance, and a capacitance connected in parallel to the series circuit as shown in the drawing.

Here, C0, which is commonly known as the shunt capacitance, comprises an inter-electrode static capacitance to which the inter-terminal stray capacitance is added.

L1 and C1 are the equivalent constants of the quartz crystal unit veiwed as an electrical and mechanical oscillation system. Since both constants are determined by such factors as the type of cut, cutting angle, dimensions of the crystal piece, and construction of the electrodes, and are thus reproducible, quartz crystal units, can be manufactured to high precisions.

R1, which denotes oscillation loss, is governed by such conditions as the cutting, mounting, and dimensions of the quartz crystal.

L1 Motional inductance
C1 Motional capacitance
R1 Motional (Series) resistance
C0 Shunt capacitance

The electrical equivalent circuit, composed of L1, C1, R1 ,and C0, all of which are correlated, may be expressed by the following equation.

Shown below are some equations by which the performances of quartz crystal units are expressed.

  • Ceramic Processing
  • Core technologies of Citizen Finetech Miyota
  • Technology Library Succeeding in various fields with original technologies
Click here to purchase small quantity
Supplier list
Click here to purchase small quantity
Click here to purchase small quantity.
Get ADOBE READER
You need Adobe® Reader to see and print out PDF files. Please click this button and download free Adobe® Reader.
TO PAGE TOP