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Why linearisation techniques for RF PAs are so important?

Why linearisation techniques for RF PAs are so important?

  • Categories:News
  • Author:AmpliVisionS
  • Origin:AmpliVisionS
  • Time of issue:2023-10-23
  • Views:92

(Summary description)In today's dynamic world of wireless communication, one thing stands out - the growing emphasis on linearity. Modern communication systems are shifting towards linear modulation techniques, demanding RF systems with exceptional linearity.

Why linearisation techniques for RF PAs are so important?

(Summary description)In today's dynamic world of wireless communication, one thing stands out - the growing emphasis on linearity. Modern communication systems are shifting towards linear modulation techniques, demanding RF systems with exceptional linearity.

  • Categories:News
  • Author:AmpliVisionS
  • Origin:AmpliVisionS
  • Time of issue:2023-10-23
  • Views:92
Information

In today's dynamic world of wireless communication, one thing stands out - the growing emphasis on linearity. Modern communication systems are shifting towards linear modulation techniques, demanding RF systems with exceptional linearity.

 

Power amplifiers, which supply power to the modulated signal from the power source, have a nuanced relationship with linearity. Analyzing a PA's distortion model (Taylor Series Model), it's evident that small input signal amplitudes exert a minor influence on PA's non-linearity. But, when those input signals grow substantial, non-linearity rears its head, becoming a key player.

 

With the surge in the number of wireless users, the available frequency spectrum is becoming increasingly congested. To optimize spectral efficiency, linear modulation techniques like QAM, QPSK, and OFDM are widely employed. However, these techniques, predominantly envelope-based, introduce non-linear distortions.

 

In the world of active RF components, non-linear devices pose a challenge. Envelope-modulated signals passing through these systems generate non-linear distortions, and harmonics can spill into adjacent channels, causing interference. Hence, RF transmitters necessitate control over the input signal's amplitude.

 

This is where linearized transmitting systems come into the picture. But, it's the Power Amplifier that holds the fort in transmitting systems. These amplifiers must operate in a non-linear state to achieve high efficiency. So, the crux is enhancing the linearity of Power Amplifiers. And today, RF Power Amplifier Linearization has emerged as an increasingly vital field of research in the communication domain.

Let's delve into some RF Power Amplifier Linearization Techniques!

 

1. Feedforward: A widely-used technique that involves selecting high-power devices to operate as low-power devices, improving linearity.

 

2. Predistortion: This method involves inserting a nonlinear circuit to compensate for the amplifier's nonlinear distortion.

 

3. Envelope Elimination and Restoration (EER): Here, RF signal amplitude and phase are separated, with the phase signal going through a nonlinear power amplifier. Envelope signals are restored to the carrier signal by adjusting the bias voltage.

 

4. CALLUM (Combined Analogue Locked Loop Universal Modulator): An offspring of LINC, CALLUM applies Cartesian feedback, feeding back output signals to maintain signal linearity.

 

The key is combining these techniques to leverage their strengths and compensate for their limitations. In the ever-evolving landscape of RF amplification, AmpliVisionS takes the lead!

 

Empower your systems, explore new possibilities, and elevate your RF communication with AmpliVisionS!

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Time of issue:2021-09-22 10:46:18

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