6. When the loop is in lock in a PLL, the input frequency is ________ the output frequency from the VCO.
(a) the same as
(b) greater than
(c) smaller than
(d) None of the above
7. Nota
8. A voltage-controlled oscillator (VCO) is a circuit that provides a ________ output signal.
(a) zero
(b) varying
(c) constant
(d) None of the above
9. When the input to the 311 voltage comparator is ________ value, the output is ________ if the inverting input is connected to ground.
(a) any negative, low
(b) any positive, low
(c) any positive, high
(d) None of the above
10. A comparator circuit accepts input of ________ voltages and provides a ________ output that indicates when one input is less than or greater than the second.
(a) linear, digital
(b) linear, linear
(c) digital, linear
(d) None of the above
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