How to double a regulated voltage

[Alex30]

So I was wondering what's the best way to double a regulated voltage of up to 1V? I have a sense signal which goes between 0->1V but I want to be able to double it to throw it on a voltmeter. The only thing is I have been looking at these circuits for doubling voltage but most of them seem to be for an unregulated DC supply. How do I accomplish this with a very clean 0->1V DC range? Oh I also want it to be as accurate as possible

[WarSim]

So I was wondering what's the best way to double a regulated voltage of up to 1V? I have a sense signal which goes between 0->1V but I want to be able to double it to throw it on a voltmeter. The only thing is I have been looking at these circuits for doubling voltage but most of them seem to be for an unregulated DC supply. How do I accomplish this with a very clean 0->1V DC range? Oh I also want it to be as accurate as possible

If you have the supply voltages for an op amp available.  An op amp based 2x amplifier would be a very common method. 
Depending on the frequency range a transistor based 2x amplifier would be easy also if you don't need true 0v.


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[IanB]

To increase a smaller voltage to a larger one you use an amplifier.

If you want to exactly double it use a precision amplifier with the gain set to 2.

This is the job op amps were designed for.

[Alex30]

Okay, I was just wondering if there was a cheaper option but looks like no (that is with using some diode and capacitor trickery). Thanks!

[IanB]

Okay, I was just wondering if there was a cheaper option but looks like no (that is with using some diode and capacitor trickery). Thanks!

You aren't going to get cheaper than an op amp and a few resistors...

[Alex30]

Okay, I was just wondering if there was a cheaper option but looks like no (that is with using some diode and capacitor trickery). Thanks!

You aren't going to get cheaper than an op amp and a few resistors...

I suppose so.

[David Hess]

A charge pump like an LTC1043 can be used as a precision voltage doubler which avoids matched resistors and the errors from operational amplifiers.

[IanB]

A charge pump like an LTC1043 can be used as a precision voltage doubler which avoids matched resistors and the errors from operational amplifiers.

Neat.

[David Hess]

A charge pump like an LTC1043 can be used as a precision voltage doubler which avoids matched resistors and the errors from operational amplifiers.

Neat.

You can find them used in precision circuits like those found in multimeters with 6 digits or more.  An equivalent circuit using a resistive dividers requires matching to within 1 ppm which is a lot more difficult and expensive.

[Alex30]

A charge pump like an LTC1043 can be used as a precision voltage doubler which avoids matched resistors and the errors from operational amplifiers.

Excellent thanks, this is the sort of device I was wondering about. But gee, $9.25 from rs? Will certainly keep this in mind for other projects but for this one I think I will just use an opamp and have a calibration pot. Thanks for the reply!

[David Hess]

A charge pump like an LTC1043 can be used as a precision voltage doubler which avoids matched resistors and the errors from operational amplifiers.

Excellent thanks, this is the sort of device I was wondering about. But gee, $9.25 from rs? Will certainly keep this in mind for other projects but for this one I think I will just use an opamp and have a calibration pot. Thanks for the reply!

The LTC1043 may be the best of the precision charge pumps for this type of application but it can also be done with general purposes analog switches if you can arrange non-overlapping drive which many have built in.  Look for ones with low charge injection.

[WarSim]

A charge pump like an LTC1043 can be used as a precision voltage doubler which avoids matched resistors and the errors from operational amplifiers.

Excellent thanks, this is the sort of device I was wondering about. But gee, $9.25 from rs? Will certainly keep this in mind for other projects but for this one I think I will just use an opamp and have a calibration pot. Thanks for the reply!

Yes you got suggestions that will work in most cases, because you did not supply any accuracy specs.  Higher the specs required higher the cost.  Figure out your requirements and your target budget, then the advice supplied will be more tailored to you needs. 


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