Voltage-controlled attenuators characterised

Product Description

RFMD’s RFSA3013 is a fully monolithic analog voltage controlled attenuator (VCA) featuring exceptional linearity over a minimum temperature compensated 30dB gain control range. It incorporates a revolutionary new circuit architecture to solve a long standing industry problem: high IP3, high attenuation range, low DC current, broad bandwidth and temperature compensated linear in dB control voltage characteristic. This voltage controlled attenuator is controlled by a single positive control voltage with on-chip DC conditioning circuitry. The slope of the control voltage versus gain is selectable. The RFSA3013 draws a very low 1mA current and is packaged in a small 3mmx 3mm QFN. This attenuator is matched to 75Ω over its rated control range and frequency with no external matching components required. Typical VCAs in this performance category have poor inherent attenuation versus temperature and poor nonlinear attenuation versus control voltage characteristics. To correct these shortcomings, other VCAs require extensive off chip analog support circuitry that consume valuable PCB area and additional DC power. This game changing product incorporates the complete solution in a small 3mm x 3mm QFN package that reduces the footprint by 20X in area and reduces the DC power by 10X over conventional PIN diode approaches.


  • Patent Pending Circuit Architecture
  • Broadband 50MHz to 3000MHz Frequency Range
  • 30dB Attenuation Range
  • +50dBm IIP3 Typical
  • +80dBm IIP2 Typical
  • Low Distortion -65dBc CSO and -70dBc CTB for 112 Channel 39dBmV Input
  • High 1dB Compression Point >+30dBm
  • Low Supply Current 1mA Typical
  • 5V Power Supply
  • Linear in dB Control Characteristic
  • Internal Temperature Compensation
  • Class 1C ESD (1000V)
  • Complete Solution in a Small 3mm x 3mm, QFN Package
  • 3.3V Version Available, RFSA3023

Voltage-controlled attenuators characterised

RFMD’s RFSA3013 and RFSA3023 monolithic analogue voltage-controlled attenuators (VCAs) are designed for good linearity over a 30dB minimum gain control range.

These VCAs also feature internal temperature compensation that provides an attenuation profile highly insensitive to temperature changes.

Each VCA is controlled by a single positive control voltage with on-chip DC conditioning circuitry.

The slope of the control voltage versus gain is selectable.

The VCAs have been characterised for 75ohm CATV applications over the full attenuation and frequency ranges with no external matching components required.

The components are offered in a 3mm x 3mm QFN package.


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About The Author

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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