How to pregate the RF Pulse Power Amplifier.

The amplifier stages in an RFPA are muted between the RF pulses. This is for two reasons: it saves energy and more importantly it reduces noise. The latter aspect is important as the spin echo shall be received as clearly as possible.

The above picture shows the sequence:

  1. unblank (=pregate) the amplifier
  2. switch the RF on
  3. switch the RF off
  4. blank the amplifier

Often steps 3 and 4 are executed simultaneously in order to reduce the output noise of the RFPA as quickly as possible.

Pre-Gating Time.



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