Author Topic: Simplest circuits for 3 voltage levels output from 2 logic inputs  (Read 724 times)

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Offline DigitalDesignerTopic starter

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Hello,
what are the two simplest (separate) circuits for the following two tables (please note that one output in each circuit is mid of the supply voltage (1V5)?

Input A                    Input B            Output
3V3                          3V3                 0V
3V3                          0V                   0V
0V                            3V3                 3V3
0V                            0V                   1V5


Input A                    Input B            Output
3V3                          3V3                 0V
3V3                          0V                   0V
0V                            3V3                 1V5
0V                            0V                   3V3

Thank you
 

Offline MarkF

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Re: Simplest circuits for 3 voltage levels output from 2 logic inputs
« Reply #1 on: February 20, 2022, 03:12:40 pm »
I believe this circuit will implement the 2nd table.
I'm sure the 1st table can be done with P-channel MOSFETs to reverse the logic.
 

Offline DigitalDesignerTopic starter

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Re: Simplest circuits for 3 voltage levels output from 2 logic inputs
« Reply #2 on: February 21, 2022, 12:24:49 am »
Thank you Mark
 

Online Someone

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Re: Simplest circuits for 3 voltage levels output from 2 logic inputs
« Reply #3 on: February 21, 2022, 01:01:52 am »
Smells like a homework question, why is this circuit interesting? where is it used?

P.S. 1 fet, 2 resistors
 

Offline Damianos

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Re: Simplest circuits for 3 voltage levels output from 2 logic inputs
« Reply #4 on: February 21, 2022, 10:58:35 pm »
I believe this circuit will implement the 2nd table.
I'm sure the 1st table can be done with P-channel MOSFETs to reverse the logic.
Don't complicate it. The effect of A-input is the same. The B-input is inverted, so, removing the inversion of it (Q1) gives the asked result (I mean B to R2). As Someone says.
 


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