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Why does the common emitter BJT amplifier have a negative voltage gain?
question about BJTs CE configuration is an active low type of configuration… asserting the base will pull low the node at collector(wth a resistor on top of collector)… so the gain is negative… u can try it in PSPICE to see the amplifying effect is opposite direction…
What is reverse voltage blocking capability?
When a gate pulse is present, the device operates like a standard diode. When the anode is negative compared to the cathode, the device turns off and blocks positive or negative voltages present. The gate voltage does not allow the device to turn off. When off, it is considered a reverse voltage blocking device.
Can power gain be negative?
Power gain is defined by the ratio of radiated power in max. direction/input power. Negative values occur when there is a mismatch at antenna input or when there are losses.
Why is BJT in reverse active mode of Operation?
Wiki about BJT: look especially the section Structure and the reverse-active operating mode The lack of symmetry is primarily due to the doping ratios of the emitter and the collector.
Is there a negative voltage for VCE-BJT NPN?
BTW: the title of the question “Negative voltage for Vce – BJT NPN” doesn’t fit to the schematic: Vce would only be negative if V1 > V2. Redrawn with proper conventions for orientation in a logic diagram.
Why does a BJT have a lack of symmetry?
The lack of symmetry is primarily due to the doping ratios of the emitter and the collector. The emitter is heavily doped, while the collector is lightly doped, allowing a large reverse bias voltage to be applied before the collector–base junction breaks down.
What is the saturation voltage of a BJT?
In this mode BJTs have very low saturation voltage. Several mV is a common value. This behavior has been used in the past for building analog switches, charge pumps and similar, where the saturation voltage determines the accuracy of the device. Now MOSFETS are used in such applications.