Equivalent Circuit of Crystal Oscillation Circuit

Home > Equivalent Circuit of Crystal Oscillation Circuit

Equivalent Circuit of Crystal Oscillation Circuit

When a crystalunit is actuated as an inductive reactance in an oscillation circuit, therelationship between crystal unit and oscillation circuit is shown in Fig.8.Toimprove the starting conditions of the oscillation circuit, it is preferable toincrease the value of negative resistance -R which parameter of the oscillationcircuit .

The startingconditions will become worse if a circuit without much allowance in negativeresistance (less negative resistance )is combined with a crystal unit having alarger resonance resistance. The oscillation circuit should be designed to Agoal such that the value of negative resistance is 5 to 10 times the resonanceresistance.

It is alsonecessary that the center value of load capacitance (to determine the absolutevalue of oscillation frequency )and the variable range (fine adjustment rangeof oscillation frequency) are maintained at the optimum values in theOscillation circuit.


ISO 9001	Rohs Compliant	ERA Manufacturer Member

TGS(USA),INC.