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Oscillation Circuit Evaluation Methods
What is "Startup Time" (2) <Measuring method>
Overview: Obtain the startup data of the oscillator circuit with a voltage probe of low capacitance/high impedance voltage probe and read it with an oscilloscope.
＜Measurement procedure＞
| -1 | Contact the tip of a voltage probe with low capacitance/high impedance (using a FET probe in NDK) to the measurement point (input terminal of the target oscillator circuit). |
| -2 | Connect the FET probe to the oscilloscope input channel. |
| -3 | Set the oscilloscope trigger level appropriately so that the startup waveform can be obtained. |
| -4 | Apply a predetermined voltage to the target oscillation circuit and start oscillation (start-up waveform is acquired immediately after the start of oscillation). |
| -5 | Read the startup time from the startup waveform (refer to What is "Startup TimeImprovement method (1) ). |
Fig. 1 shows an example of the state immediately after the measurement procedure (5).
