Unformatted text preview: 29. Parasitic oscillations are higher frequency self-oscillations in RF amplifiers. 30. Self oscillation can occur at a tuned frequency or high frequency, when internal fed-back signal isn’t cancelled probability increases. 32. Class C provides an abrupt nonlinearity when the device switches on and off, allowing generation of the sum and difference frequencies. 33. The PIN diodes act as variable resistors when they are operated above 100MHz, when frequency is lower they act as regular diodes. When the modulating signal goes positive it increases the level of forward bias on the PIN diode. A negative modulating signal subtracts from the forward bias. PIN diodes are the only practical AM modulators for carriers above 100MHz....
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- Fall '11
- PIN diode, High level modulation