Oscillation Circuit Evaluation Methods
Temperature Characteristics (3) <Startup Time>
The startup time is calculated by the following formula as described in Startup Time (1) . The temperature characteristics of the startup time are determined by the temperature characteristics of L1, RL and |-R|.
Tstr: Startup time
k: Proportionality constant
L1: Equivalent motional inductance of crystal unit
|-R|: Negative resistance of the circuit (absolute value)
RL: load resonance resistance of crystal unit
1. Temperature characteristics of "L1: Equivalent motional inductance of crystal unit"
In operating temperature range specified in the specifications, L1 is almost the same.
2. Temperature characteristics in "RL: load resonance resistance in crystal unit"
In operable temperature range specified in the specifications, RL is almost the same.
3. "|-R|: Temperature characteristics of circuit negative resistance (RMS Value)"
As described in Negative resistance (4) , "The tendency generally decreases linearly from low temperature to high temperature."
This means that the higher the temperature, the greater the startup time.