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MT1198F Schematic ( PDF Datasheet ) - TDK

Teilenummer MT1198F
Beschreibung Glossary
Hersteller TDK
Logo TDK Logo 




Gesamt 5 Seiten
MT1198F Datasheet, Funktion
Evaluation of ceramic resonator oscillation characteristics
This paper is prepared to explain characteristics, test methods, and glossary of the oscillation circuit
composed of a CMOS inverter and ceramic resonator.
(A) Test samples
[Ceramic resonators]
We use the following two samples for evaluation:
Typical sample:
Worst sample:
sample with average resonant impedance, (TYP.)
sample with worst resonant impedance, (WST.)
[IC]
In case of providing random IC samples from IC manufacturers.
IC dependence :
Temperature dependence:
Power supply dependence:
Open loop characteristics:
Test all samples at room temperature.
Test sample with worst oscillation start voltage.
Test sample with worst oscillation start voltage.
Test sample with worst oscillation start voltage.
By combining these samples(ceramic resonator and IC),
you can find the typical and worst characteristics of the oscillation circuit.
(B) CMOS inverter characteristics
Measure a CMOS inverter's gain vs. frequency characteristics to check on the gain margin.
(C) Oscillation characteristics
Fig. 1 shows a basic oscillation circuit composed of a CMOS inverter and ceramic resonator.
Each character represents the following.
CL1:
CL2:
Rf:
Rd:
VDD:
(TA:
Input Loading Capacitor
Output Loading Capacitor
Feedback Resistor (Some Ics have built-in feedback resistor)
Damping Resistor
Power Supply Voltage
Ambient Temperature)
1





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