Interfacing to the Analog World problems
- 1. A 4-bit stairstep-ramp A/D converter has a clock frequency of 100 kHz and a maximum input of 10 V, and has 6 V applied to the input. The conversion time will be ________.
Options- A. 10 microseconds
- B. 160 microseconds
- C. 90 microseconds
- D. 6250 seconds Discuss
Correct Answer: 90 microseconds
- 2. The stability of the ADC process can be improved by using a(n) ________ to hold the analog voltage constant while the A/D conversion is taking place.
Options- A. sample-and-hold circuit
- B. op-amp comparator
- C. NPN amp
- D. current loop Discuss
Correct Answer: sample-and-hold circuit
- 3. There are many applications in which analog data must be digitized and transferred into a computer's memory. The process by which the computer acquires these digitized analog data is referred to as ________.
Options- A. sampling
- B. multiplexing
- C. data acquisition
- D. prescaling Discuss
Correct Answer: data acquisition
- 4. A simultaneous A/D converter is also known as a(n) ________ A/D converter.
Options- A. flash
- B. synchronous
- C. comparator
- D. asynchronous Discuss
Correct Answer: flash
- 5. A major application for DSP is in ________ and ________ of analog signals.
Options- A. sending, receiving
- B. digitizing, weighting
- C. filtering, conditioning
- D. leveling, translating Discuss
Correct Answer: filtering, conditioning
- 6. The input of an analog-to-digital converter is ________.
Options- A. a voltage level
- B. a clock pulse
- C. a binary number
- D. any of the above Discuss
Correct Answer: a voltage level
- 7. The characteristic that a change of one binary step on the input of a DAC should cause exactly one step change on the output is called ________.
Options- A. resolution
- B. linearity
- C. monotonicity
- D. accuracy Discuss
Correct Answer: monotonicity
- 8. On a binary-weighted D/A converter the least significant binary input ________.
Options- A. connects to the smallest resistor
- B. supplies the least voltage
- C. connects to a 1 kΩ resistor
- D. connects to the largest resistor Discuss
Correct Answer: connects to the largest resistor
- 9. ________ ADCs use no clock signal, because there is no timing or sequencing required.
Options- A. Actuator
- B. Dual
- C. Flash
- D. Bipolar Discuss
Correct Answer: Flash
- 10. The circuit shown below is a(n) ________.
Options- A. R/2R ladder D/A converter
- B. four-bit decoder
- C. binary-weighted-input DAC
- D. four-bit A/D converter Discuss
Correct Answer: binary-weighted-input DAC
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