Method 2:The Servo Method
• The Servo method is an automated technique to easily find the transition
points
• for example,we need the transition point between 11010 and 11011.We should
set search value register as 11010
• close the loop;when the circuit is stable,use a DC voltmeter to measure the
analog value at the output of the integrator.It is the transition point between
11010 and 11011
ADC
Under
Test
Digital
Comparator
Search Value
Register
one-bit
DAC
Analog
Integrator
VOH -> Ramp up
VOL -> Ramp down
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