Fill in the Blanks


1		The Schmitt trigger is a detector.


2		Phase modulation is used because the oscillator can be optimized for frequency accuracy and stability.


3		Simple phase shifters do not produce a linear response over a range of phase shift.


4		Most phase modulators are capable of producing a phase shift limited to ± 20° because of the narrow range of of the varactor.


5		A disadvantage of circuits is that they always produce amplitude variations as well as phase changes.


6		Circuits used to recover the original modulating signal from an FM transmission are called .


7		The detector is probably the single most widely used FM demodulator.


8		A phase-locked loop is a frequency- or phase-sensitive feedback control circuit used in frequency .


9		The phase-locked loop provides frequency selectivity and filtering and has a(n) ratio superior to that of any other type of FM detector.


10		The of frequencies over which a PLL will capture an input signal is known as the capture range.


11		Indirect modulators produce FM via a phase shifter the carrier oscillator stage.


12		A frequency is a circuit that varies carrier frequency in accordance with the modulating signal.


13		A is also known as a voltage variable capacitor, variable capacitance diode, or varicap.


14		oscillators provide a highly accurate carrier frequency and their frequency stability is superior over a wide temperature range.


15		A frequency multiplier circuit is one whose output frequency is some integer of the input frequency.