Figure 2 (b) shows the input characteristic curve of the transistor,
When both the emitter and collector junctions are in a positive bias state in the saturation region,
When the collector is open and a specified reverse voltage is applied between the emitter and base,
The cut-off frequencies f β and f α are 0.707 times the frequency when β drops to low frequencies
The transistor is commonly represented by "Q" and a number in circuits, for example
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