Grid tube with increased efficiency

Details Grid tube with increased efficiency Grid tube with increased efficiency

1990-11-16

1992-03-24

Peng, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358186, 358 64, H04N 514, H04N 538, H04N 916

Patent

active

050993321

ABSTRACT:
The present invention concerns a grid amplifier tube producing with an approximately constant gain at least a combination of a first signal for a short duration and a second signal for a longer duration. The maximum voltage of the first signal is higher than the maximum voltage of the second signal. To improve the efficiency of the tube, the anode polarization voltage is adjusted to a level enabling the tube to operate as a class B, AB or C amplifier and to produce the maximum voltage of the second signal but not the maximum voltage of the first signal. The class of the amplifier is made to vary towards class A for the duration of the first signal so that it produces the maximum voltage of the first signal. For this purpose at least one of the polarization voltages of the electrodes of the tube is made to vary. The present invention finds particular application to television transmitters operating in negative transmission systems.

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