How to choose between active and passive crystal oscillators

Passive crystal oscillator (Crvsta) is a type of crystal oscillator without an amplifier, which has a low output power but also has precise and stable clock signals. Passive crystal oscillators typically consist of oscillators and output stages, without amplifiers. Passive crystal oscillators are commonly used in applications that require low power and small volume, such as computers, mobile phones, etc.

The following points should be noted when using active and passive crystal oscillators:

1. Active crystal oscillators typically require the use of an external power source, while passive crystal oscillators can directly use the power source of the controlled device.

2. Active crystal oscillators have higher output power and can transmit over longer distances, but also require more power consumption. The output power of passive vibration is lower, but the power consumption is also smaller.

3. Active crystal oscillators have better signal quality, but they are also more complex and require more circuits to implement. Passive crystal oscillators have better signal quality, but they are also simpler and can be more easily integrated into circuits.

In summary, both active and passive crystal oscillators are important components for providing accurate and stable clock signals. The difference between them lies in their different working principles. Active crystal oscillators with amplifiers can provide higher output power and better signal quality, while passive crystal oscillators without amplifiers have lower power, but are more suitable for applications that require low power consumption and small size.

Here are some suggestions for choosing between active and passive crystal oscillators:

1. Stability requirements:

If high-precision and high stability clock signals are required, or for applications with high requirements such as frequency synthesis, it is recommended to choose passive crystal oscillators. Because passive crystal oscillators have higher stability, they can provide more accurate and stable output signals.

2. Output power requirements:

If higher output power and lower output impedance are required, it is recommended to choose an active crystal oscillator. Because active crystal oscillators have higher output power and lower output impedance, they can meet some application scenarios that require high output power.

3. Working voltage and current requirements:

Active crystal oscillators require external power sources or energy sources such as batteries to drive, so it is necessary to consider whether their operating voltage and current requirements meet practical application requirements. Passive crystal oscillators, on the other hand, do not require external power supply to drive, so their operating voltage and current requirements do not need to be considered.

4. Application environment requirements:

The temperature and vibration of the application environment can also affect the performance of crystal oscillators. If the application environment is harsh, it is recommended to choose an active crystal oscillator that has been specially designed to meet the requirements of the application environment.

5. Customized requirements:

If special requirements are needed for crystal oscillator products, it is necessary to understand the customization ability and service level of the crystal oscillator manufacturer in order to cooperate and arrange well in production and manufacturing.

In summary, when selecting active and passive crystal oscillators, it is necessary to comprehensively consider their stability, output power, operating voltage and current requirements, application environment requirements, as well as their customization ability and service level, and make a reasonable choice.