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单词 parametric amplifier
释义
parametric amplifier

Astronomy
  • An amplifier used in radio astronomy for the frequency range of about 1–100 GHz. They are cooled to 15–20 K to reduce noise. Parametric amplifiers operate by transferring energy to the signal from a highly stabilized laboratory oscillator known as the pump.


Electronics and Electrical Engineering
  • A microwave amplifier in which the reactance of the device is varied with respect to time in a regular manner, i.e. it is pumped. An alternating voltage, the pump voltage, is the most common form of pump. Provided that a suitable relationship is maintained between the pump frequency and the signal frequency, energy is transferred from the pump and amplification of the signal is achieved.


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