The voltage threshold for triggering a Voltage-Controlled Oscillator (VCO) in Frequency Modulation (FM) demodulation depends on the specific circuit and application. In FM demodulation, the VCO is typically used to convert the frequency variations in the input signal (modulated signal) back into voltage variations.
The voltage threshold at which a VCO starts to oscillate and generate an output frequency is determined by its design parameters, such as the control voltage range, tuning sensitivity, and biasing. The control voltage is usually the input to the VCO that determines its output frequency.
To accurately determine the voltage threshold for triggering a VCO in FM demodulation, you would need to consider the datasheet or specifications provided by the manufacturer of the VCO. These documents would detail the operating characteristics of the VCO, including the voltage range required to achieve oscillation.
In practical applications, the voltage threshold can vary depending on factors like the specific VCO circuit topology, the modulation index of the FM signal, and any additional circuitry used to condition the input signal. It's recommended to consult the datasheets and documentation of the specific VCO you are using or planning to use for more precise information on its voltage threshold and operating parameters.