Chapter Questions
Draw the diagram of a 741 op-amp operated from $\pm 15-\mathrm{V}$ supplies with $V_{i}(-)=0 \mathrm{~V}$ and $V_{i}(t)=+5 \mathrm{~V}$. Include terminal pin connections.
Sketch the output waveform for the circuit of Fig. 40 .
Draw a circuit diagram of a 311 op-amp showing an input of $10 \mathrm{~V} \mathrm{rms}$ applied to the inverting input and the plus input to ground. Identify all pin numbers.
Draw the resulting output waveform for the circuit of Fig. 41 .
Draw the circuit diagram of a zero-crossing detector using a 339 comparator stage with $\pm 12-\mathrm{V}$ supplies.
Sketch the output waveform for the circuit of Fig. $42 .$
Describe the operation of the circuit in Fig. $43 .$
Sketch a five-stage ladder network using $15-\mathrm{k} \Omega$ and $30-\mathrm{k} \Omega$ resistors.
For a reference voltage of $16 \mathrm{~V}$, calculate the output voltage for an input of 11010 to the circuit of Problem 8
What voltage resolution is possible using a 12 -stage ladder network with a $10-\mathrm{V}$ reference voltage?
For a dual-slope converter, describe what occurs during the fixed time interval and the count interval.
How many count steps occur using a 12 -stage digital counter at the output of an $\mathrm{ADC}$ ?
What is the maximum count interval using a 12 -stage counter operated at a clock rate of $20 \mathrm{MHz}$ ?
Sketch the circuit of a 555 timer connected as an astable multivibrator for operation at $350 \mathrm{kHz}$. Determine the value of capacitor $C$ needed using $R_{A}=R_{B}=7.5 \mathrm{k} \Omega$.
Draw the circuit of a one-shot using a 555 timer to provide one time period of $20 \mu \mathrm{s}$. If $R_{A}=7.5 \mathrm{k} \Omega$, what value of $C$ is needed?
Sketch the input and output waveforms for a one-shot using a 555 timer triggered by a $10-\mathrm{kHz}$ clock for $R_{A}=5.1 \mathrm{k} \Omega$ and $C=5 \mathrm{nF}$.
Calculate the center frequency of a VCO using a $566 \mathrm{IC}$ as in Fig. 22 for $R_{1}=4.7 \mathrm{k} \Omega$, $R_{2}=1.8 \mathrm{k} \Omega, R_{3}=11 \mathrm{k} \Omega$, and $C_{1}=0.001 \mu \mathrm{F}$
What frequency range results in the circuit of Fig. 23 for $C_{1}=0.001 \mu \mathrm{F}$ ?
Determine the capacitor needed in the circuit of Fig. 22 to obtain a $200-\mathrm{kHz}$ output.
Calculate the VCO free-running frequency for the circuit of Fig. $26 \mathrm{~b}$ with $R_{1}=4.7 \mathrm{k} \Omega$ and $C_{1}=0.001 \mu \mathrm{F}$.
What value of capacitor $C_{1}$ is required in the circuit of Fig. $26 \mathrm{~b}$ to obtain a center frequency of $100 \mathrm{kHz}$ ?
What is the lock range of the PLL circuit in Fig. $26 b$ for $R_{1}=4.7 \mathrm{k} \Omega$ and $C_{1}=0.001 \mu \mathrm{F}$ ?
Describe the signal conditions for current-loop and RS-232C interfaces.
What is a data bus?
What is the difference between open-collector and tri-state output?
Use Design Center to draw a schematic circuit as in Fig. 32 , using an LM11 1 with $V_{i}=5 \mathrm{~V}$ rms applied to minus ( $-$ ) input and $+5 \mathrm{~V}$ rms applied to plus $(+)$ input. Use Probe to view the output waveform.
Use Design Center to draw a schematic circuit as in Fig. 35. Examine the output listing for the results.
Use Multisim to draw a 555 oscillator with resulting output with $t_{\text {low }}=2 \mathrm{~ms}$ and $t_{\text {high }}=5 \mathrm{~ms}$.