Question
Download Solution PDFThe resolution of a dual slope ADC can be increased by
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe resolution of the dual-slope ADC is determined by the length of the run-down period and by the time measurement resolution (i.e., the frequency of the controller's clock).
The resolution (in the number of bits) is the minimum length of the run-down period for a full-scale input(Vin = - Vref).
\({t_d} = \frac{{{2^r}}}{{{f_{clk}}}}\)
Where td is the run-down period,
r is resolution
fclk is the frequency of the clock.
IMPORTANT POINT:
There are limits to the maximum resolution of the dual-slope integrating ADC. It is not possible to increase the resolution of the basic dual-slope ADC to arbitrarily high values by using longer measurement times or faster clocks.
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