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1.5 bit DAC (Read 4103 times)
aman gupta
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1.5 bit DAC
Oct 21st, 2013, 11:22am
 
Does anyone know what 1.5 bit DAC is and why it is called so ?
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boe
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Re: 1.5 bit DAC
Reply #1 - Oct 22nd, 2013, 3:34am
 
aman gupta,
a DAC with 3 levels.
- B O E
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weber8722
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Re: 1.5 bit DAC
Reply #2 - Feb 27th, 2015, 10:38am
 
So it is also the opposite of a window-comparator, having 3 states, like 00,01 and 11.

Bye Stephan
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RobG
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Re: 1.5 bit DAC
Reply #3 - Mar 28th, 2015, 7:48am
 
Looks like I'm pretty late in responding. Too bad the board is slowing down.

As mentioned, it has three levels and you make it with a differential referential reference (V1 and V2). Top level is V1-V2, obtained by connecting one input to V1 and the other input to V2. The bottom level is V2-V1, obtained by reversing the connections. The third level is 0, which is obtained by connecting both inputs to the same value. Thus it is perfectly linear, although common mode rejection of the buffering amplifier can be an issue if the point you connect to to obtain 0 is not half-way between V1 and V2.
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skyer
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Re: 1.5 bit DAC
Reply #4 - Apr 20th, 2017, 8:11pm
 
1.5 b DAC is usually used in Pipe-line ADCs, so you can read some associated papers.
good luck!
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