Oscillators operating at millimeter wavelength are difficult to realize and are also less efficient.
A. true
B. false
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Oscillators operating at millimeter wavelength are difficult to realize and are also less efficient.
A. true
B. false
The Answer Is True
Source: http://www.researchgate.net
This is due to the fact that as frequency increases to the millimeter wave range, it becomes increasingly difficult to build fundamental frequency oscillators with good conversion loss and efficiency.
The conventional approach to generating local oscillator (LO) power for millimeter and submillimeter wave heterodyne mixers is to generate power at a lower frequency and then use a frequency multiplier to increase the frequency. However, this approach does not offer good conversion loss and efficiency as the frequency multiplier’s input/output power conversion efficiency is less than unity.
In order to overcome this challenge, engineers working on the EVLA have added their own MMIC multipliers for millimeter-wave signal generation.
Frequency multipliers can also be used to design voltage-controlled oscillators running at a frequency lower than the millimeter wave range, allowing for improved conversion loss and efficiency.