Describe the operation of voltage to frequency ADC, Computer Engineering

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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.

1923_voltage to frequency ADC.png

Truth Table

A3

A2

A1

A0

d6

d5

d4

d3

d2

d1

d0

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x

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-

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-

-

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-

-

-

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-

---

-

0

0

0

-

-

-

-

-

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0

|

0

0

0

0

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-

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-

-

-

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1

|

1

0

0

1

-

-

-

-

-

-

0

-

|

0

0

0

1

-

-

-

-

-

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1

-

|

1

0

1

0

-

-

-

-

-

0

-

-

|

0

0

1

0

-

-

-

-

-

1

-

-

|

1

0

1

1

-

-

-

-

0

-

-

-

|

0

0

1

1

-

-

-

-

1

-

-

-

|

1

1

0

0

-

-

-

0

-

-

-

-

|

0

1

0

0

-

-

-

1

-

-

-

-

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1

1

0

1

-

-

0

-

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-

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0

1

0

1

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1

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-

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1

1

1

0

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0

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0

1

1

0

-

1

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1

 


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