The ZNBG4000Q16 is a wideband bias-tee designed by Zetex Semiconductors (now Diodes Incorporated). It facilitates the biasing of RF amplifiers and other active devices without disrupting the RF signal path. It is particularly suited for applications where a DC bias needs to be applied to an RF signal without introducing significant insertion loss or reflections.

Applications:

• Biasing of RF amplifiers (e.g., LNAs, power amplifiers)
• Optical modulator biasing
• Test and measurement equipment
• Broadband communication systems
• Satellite communication systems
• Wireless infrastructure

Features:

• Wideband operation: Supports a wide range of frequencies.
• Low insertion loss: Minimizes signal attenuation.
• High return loss: Provides good impedance matching.
• Integrated inductor and capacitor: Reduces external component count.
• Small form factor: Suitable for space-constrained applications.
• Surface mount technology (SMT): Facilitates automated assembly.
• RoHS compliant: Environmentally friendly.

Benefits:

• Simplified biasing: Simplifies the biasing of RF amplifiers and other active devices.
• Improved signal integrity: Low insertion loss and high return loss maintain signal integrity.
• Reduced component count: Integrated inductor and capacitor minimize the number of external components required.
• Space saving: Small form factor allows for high-density circuit designs.
• Easy assembly: SMT package simplifies the assembly process.
• Cost-effective: Reduces overall system cost.

Additional Details:

The ZNBG4000Q16 bias-tee typically operates from a single supply voltage. The inductor and capacitor values are chosen to provide a wide bandwidth and low insertion loss. The device is designed to be used in a 50-ohm environment. It is important to select a bias-tee with appropriate specifications for the frequency range and impedance of the RF signal. It will have a maximum DC current rating for the bias injection port. When used with an RF amplifier, it allows the DC bias to be supplied separately from the RF signal. The input is often connected to the output via a capacitor to block the DC.