Help with redundancy in conventional SAR ADC

Jatin12312 · 发表于 2024-4-3 11:45:16

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Suppose i have a 10 bit SAR ADC (conventional switching) with 3 binary weighted redundant bits: C10 C9 C8 C8R C7 C6 C5 C5R C4 C3 C2 C2R C1 with weights 512 256 128 128 64 32 16 16 8 4 2 2 1

How to convert the 13 bit code to 10 bit code.? Please explain by example.

appler79 · 发表于 2024-4-3 12:21:31

try to add up the redundant bits according to their original proportion by shifting them

appler79 · 发表于 2024-4-3 12:23:30

C10 C9 C8
      C8R C7 C6 C5
                        C5R C4 C3 C2
                                       C2R C1

Jatin12312 · 发表于 2024-4-3 21:55:28

Ah. I will try that.

Jatin12312 · 发表于 2024-4-4 02:50:14

appler79 发表于 2024-4-3 12:23
C10 C9 C8
C8R C7 C6 C5
C5R C4 C3 C2

This is what i get after adding the bits. There seems to be a gain error which reduces the range. Is that expected?

Jatin12312 · 发表于 2024-4-4 21:37:04

Please help!

appler79 · 发表于 2024-4-15 10:01:10

Jatin12312 发表于 2024-4-4 02:50
This is what i get after adding the bits. There seems to be a gain error which reduces the range. ...

the redundancy will change the gain when you don‘t normalize. And the ramp signal is exceeding the quantification range？

[求助] Help with redundancy in conventional SAR ADC

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