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Analog reference voltage?

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ee484

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Hi, I would like to ask you how to give analog reference voltage so that a chip takes clean as possible analog DC signal.

Can a simple lab power generator can do this? What other components should I take into account?
Or, I think it might be good idea to use voltage reference chip next to my chip so that this voltage reference chip can clean DC desired signal.
For example, I would like to have 300mV and 2.9V of reference signals. Can voltage reference chip, i.e., ADR390 (**broken link removed**), do?

I am about to design PCB and have no prior knowlege about it.
Any good starting point you can suggest? Caps and Resistors..(SMD)?

Thank you,
B
 

Use a circuit that generate a constant output current. Then you put a resistor between output and ground. Then the voltage over the resistor will be quite stable.

The arrow tells what way the current goes.
 

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    ee484

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Does LDO (Low dropout) regulator generate a constant output current? Should I buy a linear regulator to generate a constant voltage and current?
How about DAC so that I can control constant voltage or current accurately?

Thanks

Added after 58 seconds:

How do you guys generate a constant current (3.5uA) and voltage (300mV) in a lab?
 

have a look to analog seminars :
**broken link removed**
 

You just need a voltage reference or a power source to driver other circuits?
 

ee484 said:
How do you guys generate a constant current (3.5uA) and voltage (300mV) in a lab?
Click to expand...

For constant current, take a look at the circuit attached to my last post. There is several ways to construct circuits that gives the same result.

For constant voltage you need an opamp with low output impedance. Like this:
**broken link removed**

And of course, you can't combine those two functions because if the a given load resistor changes its resistance, it'l either cause the voltage or the current to change too, and both if the powersupply is poor. The question you asked may be (mis)understood so that you want a circuit that is a combined constant current and constant voltage output generator.
 

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