Voltage Controlled Crystal Oscillator Parameters and Selection

Voltage Controlled Crystal Oscillator (VCXO) is a type of quartz crystal oscillator. Its full name is voltage controlled crystal oscillator. It is a crystal oscillator that inserts a variable capacitance diode in series with a crystal resonator. The capacitance of the diode changes according to the external voltage to achieve an output frequency that can change according to the load capacitance characteristics of the crystal resonator.

The difference between real-time clock chip and crystal oscillator

Real-time clock chips and crystal oscillators both play an important role in providing clock signals in electronic devices, but their nature, functions and complexity are very different. Simply put, the crystal oscillator is the "heart" that generates a stable frequency, while the real-time clock chip is the "brain" that manages and distributes these "heartbeats".

Are 8m and 24m passive crystal oscillators universal?

Passive crystal oscillators 8MHz and 24MHz are generally not universal, which is determined by their role in the circuit and the circuit's frequency requirements.

How does a voltage-controlled crystal oscillator control frequency

The voltage-controlled crystal oscillator controls the capacitance value of the varactor diode through an external voltage, thereby adjusting the resonant frequency of the resonant circuit to achieve precise frequency control.

To evaluate the stability of the crystal oscillator, look at these 5 items

How to judge whether a crystal oscillator is stable enough? Which parameters in the data sheet are the key? Today, Xiao Yang will teach you a set of "crystal oscillator stability tips"

How to change the frequency of a programmable crystal oscillator

The core is still a high-quality quartz crystal oscillator (usually operating at a relatively low fixed frequency, such as 10 MHz, 20 MHz, 25 MHz, 50 MHz, etc.)