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PDF MT1198F Data sheet ( Hoja de datos )
| Número de pieza | MT1198F | |
| Descripción | Glossary | |
| Fabricantes | TDK | |
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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
1 page  
Therefore, cut the circuit between points A and C to get an open loop circuit as shown in Fig. 4.
This permits measurment of responses to an external input signal and evaluation of the continuous
oscillating conditions.
Conditions for judging oscillation are;(as shown in Fig. 5)
(1) Loop gain margin for C-A must be greater than 0 dB at a particular frequency
where C-A loop phase is -360°.
(2) Loop phase margin for C-A must be less than -360° at a particular frequency
where C-A loop gain is 0 dB.
Use the above measurement methods and oscillation conditions to check on the desired mode
oscillation margin and spurious mode oscillation capability.
We recommend the best circuit condition; a stable oscillation is guaranteed.
Gain
0dB
Phase
Gain
L.G.M.
LOOP GAIN MARGIN
L.P.M.
LOOP PHASE MARGIN
Frequency
Fig. 5 Open loop characteristics
Phase
-360deg.
5
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| PDF Descargar | [ Datasheet MT1198F.PDF ] | |
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