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Describe the operation of voltage to frequency ADC.
Ans:
A voltage-to-frequency converter i.e. VFC is an oscillator that frequency is linearly proportional to a control voltage. The voltage-to-frequency converter A to D Convertor is monotonic and free of missing codes, integrates noise and can consume extremely little power.
The current-steering multivibrator voltage-to-frequency converter is in fact a current to-frequency converter quite than a VFC, but, as demonstrated in Figure below, practical circuits invariably have a voltage to-current converter at the input.
The principle of operation is evident: the current discharges the capacitor till a threshold is reached, and while the capacitor terminals are reversed, the half cycle repeats by itself. The waveform across the capacitor is a linear triangular wave, although the waveform on either terminal regarding ground is the more complicated waveform shown.
Truth Table
A3
A2
A1
A0
d6
d5
d4
d3
d2
d1
d0
|
x
-
---
0
1
Simplify the given expressions using Boolean postulates Y = (A + B)(A‾ + C)(B + C) Ans. Y = (A + B)(A‾ + C)(B + C) = (A A‾ + AC + B A‾ + BC) (B + C) = (AC + B A‾ + BC) (B + C)
Consider a processor with a 4-stage pipeline. Each time a conditional branch is encountered, the pipeline must be flushed (3 partially completed instructions are lost). Determine
The logic circuit shown in the given figure can be minimised to Ans. The minimised figure of logic diagram is D, the output of the logic circuit is as Y=(X+Y')'+(X'+(X+
1+1
The last character of the LDB name denote?? Application
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Convert the octal number 7401 to Binary. Ans. Octal number 7401 to Binary conversion: Every octal digit represents 3 binary digits. To change an octal number to binary number,
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