Introduction to the key indicators of Oven-controlled crystal oscillator

In the field of precision electronics and automation control, OCXO is one of the core devices for high-performance clock signal generation. Its stability and accuracy directly affect the operational stability of various electronic devices in the system. This article will comprehensively analyze the core performance parameters and technical characteristics of OCXO from the perspective of key indicators.

1. The basic principle of OCXO

OCXO maintain the stability of their frequency by applying a constant temperature inside the crystal. The frequency of the crystal is greatly affected by temperature, so through constant temperature control, frequency drift can be significantly reduced, ensuring high accuracy and stability of the output signal.

2. Detailed explanation of key indicators

(1)Frequency Stability

Frequency stability is a core measure of oscillator performance, typically expressed in PPM (Parts Per Million), indicating the rate of change in frequency over time.

Typical range: Typically within ±100 PPM, with high-end products reaching ±0.1 PPM or even lower.

Influencing factors: temperature fluctuations, crystal quality, packaging process, etc.

(2)Frequency Drift

Frequency drift refers to the degree to which the oscillator frequency changes over time. A good OCXO should have low drift characteristics, ensuring stable frequency during long periods of operation.

Typical value: Typically ±100 PPM/°C, can drop below ±10 PPM/°C under constant temperature conditions.

(3)Temperature Stability

Temperature stability refers to the oscillator's ability to change frequency over the operating temperature range. The core of the design of OCXO is to achieve constant temperature, so as to ensure frequency stability.

Typical operating temperature range: Typically -40°C to +85°C, with some high-end products supporting -55°C to +125°C.

Temperature compensation technology: Temperature compensation circuit or external temperature control module is used to further improve stability.

(4)Output Waveform Quality

The waveform quality of the output signal directly affects the signal integrity of the electronic system.OCXO should have a good sine wave output to ensure signal symmetry and low distortion.

Typical output waveforms: Sine wave, stable frequency, consistent phase.

Output Power: Typically between 1mW and 1W, catering to different application needs.

(5)Operating Voltage Range

Thermostatic crystal oscillators typically operate between 2.7V and 5V, with some high-end products supporting 3.3V to 5V.

Voltage stability: It is necessary to ensure that the output frequency remains stable when the operating voltage changes.

(6)Package Type

Common package forms include SMA (small magnetic beads), BGA (ball grid array), and DIP (dual in-line plug-in), among others.

SMA: Suitable for high-frequency applications, small size, few pins.

BGA: Suitable for high-density packaging and suitable for high-precision control circuits.

DIP: Suitable for general industrial applications, easy to install and commission.

(7)Output Phase Noise

Phase noise reflects the phase jitter of signals and directly affects system performance, especially in high-frequency and high-speed communication fields.

Typical: Typically below -100 dBc/Hz, and above -140 dBc/Hz for high-end products.

3. Application fields and selection suggestions

OCXO is widely used in the following fields:

Communication systems: such as wireless communication, radar, satellite communication, etc.

Industrial control: such as PLC, DCS, industrial automation system.

Consumer electronics: such as smart watches, IoT devices, automotive electronics.

Aerospace: High-precision clock signals are used in satellite navigation and spacecraft control.

When selecting, the appropriate frequency range, temperature range, output power, and package form should be selected according to the specific application requirements. At the same time, attention should be paid to key indicators such as temperature stability and frequency drift to ensure stable and reliable system performance.

4. Conclusion

As a core device for high-precision clock signal generation, the key indicators of OCXO directly affect the performance and stability of the system. In practical applications, selecting an appropriate OCXO, combined with its temperature stability, frequency drift, output waveform quality, and other indicators, will help improve the overall performance and reliability of the system.

Whether in scientific research, industry, or consumer electronics, OCXO is indispensable components for achieving high-precision clock control. With the continuous advancement of technology, in the future, CT OCXO will develop in the direction of higher precision, lower noise, and smaller volume, providing stronger support for the intelligence and efficiency of electronic devices.