Worksheet 26-Semiconductor Voltage Regulation Flashcards
When a silicon diode is operating in forward bias how much voltage regulation can be achieved per diode?
The forward bias voltage of a silicon diode is 0.7 volts.
When a diode is operating as a voltage regulator what is its normal operating condition?
A voltage regulator diode operates in the reverse bias direction that conducts only when the breakdown voltage is reached.
For the diagram below, what is the purpose of R1?
The resistor R1 is the current limiter for D1 when current begins to flow.
In the diagram, which is the load resistor?
The resistor R3 is used for load resistance for the output.
When a voltage regulating diode is operating, what is created by the diode other than a set voltage?
The voltage regulating diodes will create heat as they operate. This will have a negative coefficient that will change the zener output voltage.
What does a Schottky Diode have over Zener diodes based on the operating principle?
A Schottky diode has a metallic junction that will allow for faster voltage recovery that in turn will allow it to operate better in high frequencies.
Draw a schematic symbol for a Zener diode.
When using a diode as a voltage regulator, what is being measured for the output of the regulator?
A voltage regulator diode the set voltage is the breakdown of the depletion zone in reverse bias.
What is the effective resistance of a diode operating in reverse bias?
Diodes operating in either forward or reverse bias have zero effect on current.
What is the purpose of a Zener diode?
A zener diode is constructed in a way that its breakdown voltage can be varied based on the size of the depletion zone.
Refer to the diagram and determine the voltage drop across R3?
The voltage drop across the load is 1.5V due to the large drop across R2.
What makes a Schottky Diode different from any other type of rectifying diode?
A Schottky diode has a metallic junction for the N material.
What is the main use of a Schottky Diode?
The metal junction that allows for high frequency operation.
Draw a schematic symbol for a Schottky diode.
