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[SOLVED] Low Voltage DC Level Shifter

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zulqar

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Hi everyone,

I am designing a circuit whose output I have attached (Amplitude is 100mV and Frequency is 20kHz). I want to shift this output to 0.5 V DC level. I will be thankful if anybody could suggest me a DC level shifter for this scenario.(Particularly I am looking for a mosfet based circuit.)

Thanks

 

hobbyckts

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Your output looks as a analog signal so add a simple summing amplifer with 2 input voltages. The first input voltage should be the output voltage which you have shown. The second should be the constant 0.5 Volt.
 

BradtheRad

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If you have a 5V supply nearby, you can add some of that to your signal, via resistive divider.



The incoming signal is attenuated slightly.
 
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BrunoARG

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Just add 2 resistors. If the AC source amplitude is Vac and you want to add 0.5V, first determine a DC supply value, say 5V.

Just as BradtheRad says, a voltage divider between two voltage sources will generate a summing of both signals with some attenuation. To supress that total AC attenuation you must amplify it before the divider.
 
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asdf44

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Another option: AC couple with a cap, then shift to whatever voltage you want. Unless it's very slow this is quite easy, and won't attenuate (<<1%) with proper component selection. But it will have some start up time and won't work for DC.
 

RajkumarS

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Hi zulqar,

Amplify the signal by using CS stage then buffer the signal by using DC level shifter.

Thanks
Rajkumar S
 

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