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bandgap and regulator

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alok_ky

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What is the difference between a voltage bandgap and a voltage regulator ???
 

They both do produce a controlled voltage. A bandgap is a circuit (usually with temperature compensation) that is mostly used a constant stable reference voltage.

A regulator (for example a linear regulator) is a circuit which uses a series transistor as a variable resitor to regulate the voltage across a load. In order to provide a constant output a feedback loop is established usually comparing the output voltage (or a portion of the output voltage, using a resistive divider) to a known reference voltage (like a bandgap reference from above). So a bandgap is an integral part of the regulator system.

Best regards,
v_c
 

Rout(regulator)<Rout(bandgap)
 

I agree with v_c.
"a bandgap is an integral part of the regulator system."
regulator can make bandgap's load characteristics more excellent.
 

alok_ky said:
What is the difference between a voltage bandgap and a voltage regulator ???
Click to expand...


Both provide DC output voltage but regulator has the capability to drive resistive load but bandgap cannot and bandgap only can drive capacitive load.
 

Bandgap is a kind of circuit to provide a temperature independene voltage reference.
Voltage regulator is a circuit to keep a node voltage constant. And usually it require a voltage reference.
 

yes, in my opinion,bandgap can not drive a resistor load,for if the current through the output branch changed,the positive and negative TC will not counterbalance each other.
 

You can draw 'some' current from a bandgap reference - you need to check the specifications. Some 'shunt' bandgaps can be used as low power voltage regulators.

Keith
 

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