Transistor as a switchdoi:10.1016/B978-0-7506-0222-8.50037-5Keith BrindleyNewnes Electronics Assembly Pocket Book
Transistor as a switchMiddleton, Brandon
• Transistor operates as an "open switch" Figure 3. Cut-off Region Characteristics. Image used courtesy of Simon Munyua Mugo The transistor operation is similar to that of a single-pole single-throw solid state switch, where when zero signals are applied at its base, then it remains OFF...
Here, the transistor functions as an OPEN switch When the transistor is completely OFF, it moves into the cut-off region The base-collector junction is in reverse biased condition There will be no flow of current in the collector terminal which means Ic = 0 ...
PNP-transistor works as a switch: The Emitter potential for aPNPtransistor needs to be positive with respect to the Base. The transistor then functions as a solid-state "single-pole single-throw"(SPST)switch. The transistor becomes "OFF," operating like an open switch when a zero signal is...
1. A small electronic device containing a semiconductor and having at least three electrical contacts, used in a circuit as an amplifier, detector, or switch. 2. Any of various devices serving the same purpose but employing a different technology: an optical transistor. 3. A transistor radio....
A transistor switchis a circuit in which the collector of the transistor is switched ON/OFF with relatively larger current in response to a correspondingly switching low current ON/OFF signal at its base emitter. As an example, the followingBJT configuration can be used as a switchfor inverting...
Without going too deep into transistor theory, the active region entails a range of operating points (Google “transistor characteristic curves”) at which the transistor will amplify a signal without distortion. On the other hand, when the transistor is used as a switch, it is operating in wha...
the current or voltage at this layer produces a large, rapid change in the current passing through the entire component, enabling the transistor to function. This change occurs at the junction of both the n-type and p-type layers, also called the depletion region, which acts as an insulator...
The majority current—electrons in the npn transistor and holes in the pnp transistor—“arrives” in the collector region as Ic. The efficiency of charge transport from emitter to collector is given by the factor α, such that (4.7)Ic=αIe Fig. 4.7a shows a circuit to measure the collect...