Help about electronic circuit (DAC with op amp)

MrAl

Joined Jun 17, 2014
11,280
Can anyone please solve this problems ?
That DAC looks unusual. Looks like a cross between a 1R2R and a 1248 binary weighted network. The transfer function may be very unusual but I did not analyze it yet.

Oh, I see there is an assumption that allows it to work like a regular DAC.
 
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MrAl

Joined Jun 17, 2014
11,280
Can anyone please solve this problems ?
Hello again,

It appears that you need some hints to get going.

For the DAC, do you know how to calculate the gain of an inverting op amp amplifier? You need to know that.
You simply start changing the state of the switches and calculate and recalculate the gain, then try to figure out how that gain is changing.
That's the way to solve that problem. The others will be a little different but you should do one at a time.
 
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