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* Question
| How to choose a varactor? |
* Answer
| 1 varactor diode is used in the resonant network to replace the traditional variable capacitor, so there must be enough Q value (the ratio of the inductive reactance or the anti-buck circuit resistance when the tuning circuit is resonant, the larger the Q value, the circuit selectionThe better the sex).2 Also pay attention to the junction capacitance and IU capacity changes.3 use variable capacity: pole tube ft inch, to avoid variable capacity _ the DC control of the pole tube and the oscillating circuit DC power supply system interaction; usually use an inductor or fire Resistors to isolate the two. |