- (SAR, Successive Approximation Register) , , , :
1. - , 1/2Uref ( , (0 Uref).
2. , , , .., , 3/4Uref. , (.. 1/4Uref).
3. 2 N . , N () N .
. 2. .
, :
1. . ( . 2. ).
2. - (Digital to Analog Converter, DAC). .
3. (Successive Approximation Register, SAR). , , . .
4. - (Sample/Hold, S/H). , . . - , .
: N- N . 16-18 ( 24- SAR ADC, , AD7766 AD7767).
-
-
- , . -
, . , , . , . , : (. 4). , , N- . . 3. , , .
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. 4. -
. 5 () Vref/2 ().
. 5. .
, , , - .
- , . 3, (. 6):
. 6. -
, .
1/s. , X(s), - Y(s), E(s), :
Y(s) = X(s)/(s+1) + E(s)s/(s+1)
, - (1/(s+1)) , (s/(s+1)) , . , , , .
. 7.
, (noise shaping) - .
, - , . , , - . - .
, , , , . .