Download Applications and Devices Part B by R.K. Willardson and Albert C. Beer (Eds.) PDF

By R.K. Willardson and Albert C. Beer (Eds.)

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12. As the avalanche region widens, the optimum frequency for this bias current decreases and the Q degrades. It is seen that a larger bias current is required for the optimum Q with a wider avalanche region. This bas an important practical implication :as an oscillator, the structure with a narrower avalanche region will reach a “reasonable” efficiency at lower bias currents. This is an advantage for CW operation. 7. 21h. ,f: Implication of Small-Signal Q with Regard to Oscillator Perfbrmance Since it is possible to perform extensive analysis of the diode in the smallsignal regime because of its simplicity, it will be very convenient if the largesignal performance of the diode can be predicted from the small-signal analysis.

1. own in Fig. 27 as a function of amplitude for the various bias currents The quiescent voltage goes up with current because of space-charge resistance. As the amplitude increases, the average voltage goes down. This is understood as follows. As noted before, the current waveform is almost independent of amplitude. The same field is required to produce the same current. Therefore, the field preceding the ,Io([)pulse will remain the same even as the amplitude increases. As seen from Fig. 24 or Eq.

This corresponds to the case designated by EL in Fig. 25. Another quarter cycle later, the electrons are disappearing and the field in the avalanche region starts to grow above the quiescent value. The amplitude of oscillation is relatively small here. The electron pulse has not yet sharpened as in Fig. 24 and no sign of bottoming of the field at the trailing edge is seen at time (3). Actually, the field is bottoming at the leading edge. 6 GHz with a voltage amplitude of 38 V. The efficiency is still sharply increasing with amplitude at this point.

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