[SOLVED] Low Voltage DC Level Shifter

[IntuitiveAnalog]

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]

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]

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.

 

[BrunoARG]

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.

 

[asdf44]

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]

Hi zulqar,

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

Thanks
Rajkumar S