Interfacing to the Analog World
Which of the equations below expresses the voltage gain relationship for an operational amplifier
Vout = Vin/Av
Vout/Vin = –Rf/Rin
Vin/Vout = Rout/Rin
Vout/Vin = Rout/Rin
What is the current in R1 and the current in R2 for the circuit shown below
I1 = 1.25 mA, I2 = 0.625 mA
I1 = 0.357 mA, I2 = 0.357 mA
I1 = 0.625 mA, I2 = 1.25 mA
I1 = 0.416 mA, I2 = 0.416 mA
What is the current in the feedback resistor for the circuit given below
What is the maximum conversion time for an 8-bit successive-approximation ADC with a clock frequency of 20 kHz
What is the resolution, in percent, of a 12-bit DAC
Two principal advantages of the dual-slope ADC are its
low sensitivity to noise and low cost.
high speed and low cost.
high sensitivity to noise and low cost.
low sensitivity to noise and high speed.
How many different voltages can be output from a DAC with a 6-bit resolution
Inaccurate A/D conversion may be due to
intermittent counter inputs
linear ramp usage
faulty sample-and-hold circuitry
constant analog input voltage
When comparing the conversions from digital-to-analog and analog-to-digital, the A/D conversion is generally
more complicated and more time consuming than the D/A conversion.
less complicated and less time consuming than the D/A conversion.
more complicated but less time consuming than the D/A conversion.
less complicated but more time consuming than the D/A conversion.
A signal ________ is produced by sampling the signal at a rate less than the minimum rate identified by Nyquist
For each bit that is added to a digital ramp ADC, the conversion time ________
decreases by one-half
decreases by one-third
Referring to the given figure, what appears to be wrong, if anything, with the output of the D/A converter
It appears that certain input codes are incorrect; double-check the input coding.
The input signal is probably noisy.
The converter has a nonmonotonic output error.
There appears to be some nonlinearity in the scope display.
The main advantage of the tracking A/D converter over the stairstep-ramp A/D converter is that ________
It is faster
it uses an up/down counter to measure both positive and negative voltages
it uses an up/down counter to indicate the polarity of the input voltage
it does not require a counter
The figure given below represents a ________
tracking A/D converter
Successive-approximation A/D converter
dual-approximation D/A comparator
Dual-slope A/D converter
What is the conversion time of a flash converter
The conversion takes place continuously.
________ are the most linear of all the temperature transducers
IC temperature sensors
Resistance temperature detectors
What is the output voltage for the circuit shown below
What circuitry is on an ADC0808 IC
A 3-bit select input code
All of the above
Why is a binary-weighted DAC usually limited to 4-bit binary conversion
too many different values of capacitors
too many different values of resistors
too many pins on the IC
too many op amps needed
A major application for DSP is in ________ and ________ of analog signals
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Interfacing to the Analog World
Analog and Digital Converters
Analog to Digital
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