Feature: RF design
Figure 2: Amplifier equipped with an isolator at the output
distortions. Harmonic distortion increases when an amplifier is over-driven and generates unwanted signal harmonics that interfere with the desired output, degrading spectral regrowth and reducing signal-to-noise ratio (SNR). Intermodulation distortion occurs when multiple signals interact at the input of an over-driven amplifier. Te non-linearities in the amplifier mix these signals, creating intermodulation products that can fall within the signal band, leading to interference.
Additionally, excessive amplification
raises thermal noise – also known as Johnson or Nyquist noise – further reducing the SNR, degrading overall signal clarity and quality.
Increasing performance Incorporating an isolator into a millimetre-wave amplifier stabilises load conditions across all frequencies. While isolators introduce insertion loss, amplifiers can be adjusted to compensate. However, increasing output power to
offset these losses comes at a price, which are higher temperature, reduced component lifespan and compromised signal integrity. By adopting new isolator designs,
engineers can significantly reduce insertion loss, improve thermal management and optimise system performance. Advanced isolators not only ensure that millimetre-wave amplifiers maintain peak efficiency but also enhance reliability and longevity over extended operational periods.
Figure 3: System improvements when using a Micro Harmonics isolator with an amplifier
32 October 2025
www.electronicsworld.co.uk
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