Digital signal processing (AQA A-Level Physics): Quizzes

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Astables
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What is the key characteristic of an astable circuit?

It has no stable states

How is the period tpt_p of an astable circuit calculated?

tp=ton+tofft_p = t_{on} + t_{off}

What is the formula for the clock rate (pulse frequency)?

1tp\frac{1}{t_p}

What is the duty cycle formula?

tontp×100\frac{t_{on}}{t_p} \times 100

If ton=tofft_{on} = t_{off}, what is the mark-to-space ratio?

1:1

What components form an astable circuit?

RC network + NOT gate with hysteresis

What is the upper switching threshold in an astable NOT gate?

23Vs\frac{2}{3} V_s

What is the lower switching threshold in an astable NOT gate?

13Vs\frac{1}{3} V_s

What is the period formula for an RC astable circuit?

tp=1.4RCt_p = 1.4 RC

In an RC astable, what are tont_{on} and tofft_{off} equal to?

0.7RC0.7 RC

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