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.)

From DS12C887 to YSN8130: Miniaturization and low power consumption of real-time clock chips

YSN8130: Using the advanced I²C serial interface, only two signal lines are needed, and the number of pins is reduced by 90%. LGA 3.2×2.5×1.0mm ultra-miniature package, the volume is reduced by 95% compared to DS12C887

How to judge whether the crystal oscillator is oscillating

The crystal oscillator waveform is generally a sine wave or a square wave. When the output waveform is a square wave, the rising edge is generally steeper and contains more high-frequency signals.

The difference between differential crystal oscillator and passive crystal oscillator

Differential crystal oscillators use two signals with completely opposite phases to each other, thereby eliminating common-mode noise and achieving a higher-performance system. Passive crystal oscillators are essentially passive components that rely on external circuits (such as the oscillator inside the MCU) to drive them. Load capacitance and resistance must be matched for stable operation.