Hello, I need to design a temperature-sensitive voltage supply (Vsk) with the following requirements: the supply voltage should maintain stability with minimal variation due to temperature changes. The design should incorporate an operational amplifier, a fixed-voltage LDO, and a DAC. The voltage should have a flexibility of 0.2V and operate with low noise. Could someone provide guidance or suggestions on how to achieve this?

 

Homework?

 

yes

 

The first thing you need to do is turn the vague wishes into performance specifications.

The objective that it should "operate with low noise" is meaningless. What constitutes "low noise"? How will the noise be measured to determine if it is low enough? Similarly, how can you know if your supply is able to "maintain stability with minimal variation due to temperature changes"?

How can you possibly design a supply that is good enough when you have no measurable specification that dictate what good enough is?

 

okay so lets move on with specifications i have supply VSK= 11V±200mV current upto 30mA and noise up to 30μV (1Hz~50kHz)

 

What about the amount of current variation with temperature?

 

These are specification max current should be 30mA

 

Current Variation is not a specified i am given with these specificatins

 

So it is a fixed voltage supply of 11V, up to 30mA output without any current limiting control?

What does “temperature sensitive” mean? To me, that means the voltage changes with temperature. I suspect you mean the opposite.

And what is the input?

 

Vsk is basically pixel array power supply and input could be 5V.Temperature sensitive means that whatever the temperature is output is always maintained at 11V

 

I have devised a scheme where I plan to use an LDO regulator to provide a stable 10V output and combine it with a DAC, feeding both into a summing amplifier. This setup offers the added advantage of making the VSK digitally tunable, providing greater flexibility and precision.

 

I have devised a scheme where I plan to use an LDO regulator to provide a stable 10V output and combine it with a DAC, feeding both into a summing amplifier. This setup offers the added advantage of making the VSK digitally tunable, providing greater flexibility and precision.

And how are you going to compensate for the temperature drift in the resistors?

 

How can I compensate for the temperature drift in resistors? I'm not sure how to address this issue effectively. Do you have any suggestions or ideas on whether this approach might work?

 

Would have to have a schematic first. This is not something I have expertise in. Was just raising the question because you say it must be stable over temperature changes.

 

oh okay

 

Temperature sensitive means that whatever the temperature is output is always maintained at 11V

Seems to be the opposite.

 

Oh yes i mean whatever the situation is output should be maintained