when do we know to use open circuit or assume high and low of ac in? my professor does open circuit in most cases especially with mosfet or is that for mosfet only
@@BBoysAndTrickers In MOSFETs and FETs, since the gate terminal doesn't draw any current (we can neglect the very small current to the gate) , then we can assume the the gate terminal has zero voltage when there is no voltage applied to the gate.
@@EngineeringinDepthThe base current depends on the base resistor and the voltage. The base current becomes part of the emitter current, but does not increase. Beta affects only the collector current and the emitter current
@@artemdavinci For BJT transistors, we always have IE = (1+β) *IB and IC = β*IB. The fact that we use BJT transistors is their current gain. The transistors in this output stage are configured as a common collector (emitter follower) for this reason to provide higher output current gain at their emitter terminals.
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very interested .thank you
So glad you enjoyed it
These are great practice problems, please keep them coming! Are you a prof?
Thank you!
Very good
Glad you liked it!
when do we know to use open circuit or assume high and low of ac in? my professor does open circuit in most cases especially with mosfet or is that for mosfet only
Can you please clarify the use of open circuit? do you mean when there is no any voltage applied to the input terminal?
@@EngineeringinDepth yes, with Vp still active
@@BBoysAndTrickers In MOSFETs and FETs, since the gate terminal doesn't draw any current (we can neglect the very small current to the gate) , then we can assume the the gate terminal has zero voltage when there is no voltage applied to the gate.
Why the gain factor for base current calculation? These are unrelated parameters.
Do you mean Beta is unrelated? can you elaborate more?
@@EngineeringinDepthThe base current depends on the base resistor and the voltage. The base current becomes part of the emitter current, but does not increase. Beta affects only the collector current and the emitter current
@@artemdavinci For BJT transistors, we always have IE = (1+β) *IB and IC = β*IB. The fact that we use BJT transistors is their current gain. The transistors in this output stage are configured as a common collector (emitter follower) for this reason to provide higher output current gain at their emitter terminals.