Exam 21: Oscillators Key

A flip-flop is another name for the

A frequency change of an oscillator over time caused by temperature,aging,and other causes is referred to as ________.

A two-state circuit that has zero,one,or two stable output states is called

When accuracy and stability of oscillation frequency are important,a quartz-crystal oscillator is used.

The Wien-bridge oscillator uses a resonant feedback circuit called a

A Hartley oscillator can be recognized by its

An amplifier with positive feedback and no external input will

When accuracy and stability of the oscillation frequency are important,which oscillator is the best choice?

When the 555 timer is used with only one stable state,it is referred to as

PWM allows a low-frequency modulating signal to change the pulse width of a high-frequency signal called the

Some function generator ICs are well suited for electronic communications applications since they have an output impedance of ________.

Some phase-shift oscillator configurations use

A twin-T filter acts like a lead-lag circuit with a changing phase angle.

Which of the following is not a waveform that can be generated by an IC function generator?

Which is not a mode of operation for the 555 timer?

When the 555 timer is operated with no stable states,it is called

RC oscillators can produce almost perfect sine waves at frequencies above 1 MHz.

A Colpitts oscillator can be recognized by its

What is exhibited when an ac voltage placed across a crystal causes it to vibrate at the frequency of the applied voltage?

A crystal oscillator that is designed to reduce the effect of stray capacitances is the ________.