Q1's collector current will be essentially zero, so R2 will pull the output voltage Q high ( logic 1; near V + ).
32.
Except at low collector-emitter voltages, the secondary breakdown limit restricts the collector current more than the steady-state power dissipation of the device.
33.
A saturated transistor is turned on hard, which means it has a lot more base drive than it needs for the collector current it is drawing.
34.
For positive voltages, the collector current through resistor 32 is less than the emitter current, so the base current is high to make up the difference.
35.
At low supply voltages ( typically 0.75 V and below ) the transistor requires a larger base current to maintain saturation as the collector current increases.
36.
In what follows, the output variable is selected as the short-circuit current of the amplifier, that is, the collector current of the output transistor.
37.
In a grounded-emitter transistor circuit, such as the light-switch circuit shown, as the base voltage rises, the emitter and collector currents rise exponentially.
38.
The turned on transistor's collector current will then pull the output Q low ( logic 0; V CE ( sat ) usually less than 1 volt ).
39.
Because Q 1 and Q 2 are matched, their ? 0-values also agree, making the mirror output current the same as the collector current of Q 1.
40.
All increases in voltage and current stop when the sum of the collector current of Q1 and base current of Q3 exactly balance \ scriptstyle i _ \ text { in }.
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