Zcomm VCOs: High Performance Voltage Controlled Oscillators

Introduction

Zcomm VCOs are renowned for their exceptional performance in RF and microwave applications. These voltage controlled oscillators provide precise frequency control, making them ideal for communication systems, radar, and aerospace applications. Zcomm’s innovative designs ensure reliability and efficiency, even in demanding environments. Discover their specifications and use cases.

Z-Communication manufactures VCOs that are used in PLL (Phase-Locked Loop) based frequency synthesizer designs. Z-comm VCOs are available for frequency ranges from 150 MHz to 14 GHz. Zcomm VCOs boast features such as low power consumption, ultra-fine tuning precision, and exceptional spectral purity.

Application Note: VCO in Synthesizer Design

The figure below depicts the position of a VCO in an RF synthesizer design.

As shown, the VCO converts a differential voltage into a change in the frequency of the oscillator output. This output frequency is then fed back to the input phase comparator module. Hence, the VCO corrects frequency drift due to temperature variations and aging, keeping the synthesizer output stable and locked to the reference frequency source. This reference frequency source is usually provided by an OCXO (Oven Controlled Crystal Oscillator).

The loop filter generates a voltage based on the phase difference between the reference frequency output and the VCO output. A simple loop filter can be an RC low-pass filter circuit, and a simple phase comparator circuit can be an EX-OR gate.

Z-comm VCO Selection Guide

The following factors are considered when selecting a Z-comm VCO (or any other manufacturer’s VCO):

• Frequency range of operation
• DC tuning voltage range
• Output power
• Phase noise
• $V_{CC}$, $I_{CC}$
• Pushing (MHz/Volt) - Output frequency variation due to supply voltage change
• Pulling (MHz) - Frequency variation due to load impedance change
• Package type
• Tuning speed

About Zcomm

Z-Communications Inc. has been a world leader in VCO and PLL technology for decades. Among manufacturers, Z-comm is a major VCO manufacturer for both wireless and commercial markets. Besides VCOs and PLLs, Z-comm also produces RF and microwave components. With continuous investment in R&D, Z-comm develops quality components with excellent performance.

• Visit Zcomm.com to select VCOs and PLLs available in different frequency bands.

Conclusion

Zcomm VCOs deliver unparalleled performance for RF systems across industries. With a focus on innovation and precision, they ensure optimal signal quality and reliability. Whether for communication or aerospace applications, Zcomm VCOs are a trusted choice for professionals worldwide.