The Gateway to Computer Science Excellence
+2 votes
A dual - slope analog to digital converter uses a N- bit counter,when input signal Va is being integrated ,the counter is allowed to count up to a value

a) 2^N -2


c) Proportional to Va

d)inversely proportional to Va
in Digital Logic by Junior (989 points) | 291 views

1 Answer

0 votes
For a dual slope ADC, the counter has a gated clock. The output voltage of integrator will rise upto T1 seconds with a positive slope of (-Va/RC). Va is assumed to  be negative so that this slope is positive. Under this assumption, Vref is negative.

Now if Va increases, the slope increases. Therefore time to reach peak value T1 reduces. We know the counter starts counting from 0 until time T1. So if T1 reduces, the number of counts taken is also reduced. Therefore the number of counts is inversely proportional to Va. Hence option (D).
by (11 points)

Is this question related to computer science as you are talking about ADC??

Quick search syntax
tags tag:apple
author user:martin
title title:apple
content content:apple
exclude -tag:apple
force match +apple
views views:100
score score:10
answers answers:2
is accepted isaccepted:true
is closed isclosed:true
50,737 questions
57,284 answers
104,863 users