VCXO (Voltage Controlled Crystal Oscillator) Product Introduction

2024-09-27

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Product Overview

（Voltage Controlled Crystal Oscillator，简称VCXO）

（Voltage Controlled Crystal Oscillator，简称VCXO）It is a kind of crystal oscillator that changes the output frequency by adjusting the external control voltage. It is based on the high stability of the crystal oscillator and has the characteristics of adjustable frequency, and is widely used in fields that require high frequency accuracy.

VCXO uses crystal as the resonant element and has a high Q value, which can provide very stable frequency output. By introducing a control voltage, the frequency of VCXO can be fine-tuned in a small range to meet the needs of clock synchronization or signal adjustment.

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working principle

The core components of a VCXO are quartz crystals and an oscillation circuit. When the control voltage changes, the capacitance value of the varactor diode will change accordingly, thereby affecting the total capacitance of the oscillation circuit. This change in capacitance will cause a slight shift in the oscillation frequency. The larger the control voltage, the greater the frequency offset amplitude. Therefore, the VCXO can fine-tune the frequency according to the external input voltage. Although its adjustment range is relatively small, it is sufficient to meet the requirements for applications with extremely high frequency precision.

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Product features

1. High frequency stability: VCXO uses quartz crystal as the core component, providing very high frequency stability for precision clocks and synchronization systems.

1. Frequency adjustable: By adjusting the control voltage, the output frequency can be fine-tuned within a certain range, usually from a few ppm to tens of ppm.

1. Low phase noise: VCXO has low phase noise in high-frequency applications, ensuring high-quality output signals.

Good temperature stability: The product can maintain high accuracy and stability over a wide temperature range of -40 ° C to + 85 ° C, making it suitable for a variety of environmental conditions.

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application field

1. Communication system: VCXO is widely used in wireless base stations, switches, optical fiber communication equipment and other communication systems to help achieve clock synchronization and accurate signal control.

1. Network equipment: In routers, switches, and other network equipment, VCXO is used to generate high-precision clock signals to ensure the accuracy and synchronization of data transmission.

1. Audio & video equipment: In high-end audio and video processing equipment, VCXO is used to generate low-jitter clock signals to ensure synchronous processing of audio and video signals and improve playback quality.

est and measurement instruments: VCXOs play a key role in precision instruments such as frequency meters and signal generators for accurate frequency generation and adjustment.

Satellite and navigation systems: VCXO's high-precision adjustment characteristics are suitable for navigation systems such as GPS and satellite communication, ensuring accurate frequency regulation.

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Product parameters

1.Frequency range: 1.25 MHz to 1500 MHz (depending on product model)
2. Frequency adjustment range: ± 50 ppm to ± 100 ppm
3. Input control voltage range: 0V to 5V (can vary according to product design)
4. Operating temperature range: -40 ° C to + 85 ° C
5. Phase noise: -135 dBc/Hz @1kHz offset @50MHz
6. Power supply voltage: 1.8V/2.5V/3.3V/5.0V

summary

With its excellent frequency stability and regulation capabilities, VCXO plays a crucial role in modern communications, networking, audio & video, and test and measurement. Through flexible voltage control, VCXO provides an effective solution for systems that require frequency adjustment. Whether in harsh temperature conditions or in high-precision clock synchronization, VCXO products can demonstrate their unique advantages.

Hang Jing provides VCXO products with different packaging modes and low phase noise with different output modes (CMOS, LVDS, LVPECL).