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# Circuits - grol

### topic 3 - D 24questions

What is the approximate magnitude of the impedance of a parallel R-L-C circuit at the resonance? Approximately equal to the circuit resistance
What is the approximate magnitude of the impedance of a series R-L-C circuit at resonance? approximately equal to the circuit resistance
how could voltage be greater across resistances in series that applied voltage? Resonance
what is the characteristic of the current flow in series R-L-C circuit at resonance? maximum
what is the characteristic of the flow within the parallel elements in a parallel R-L-C circuit at resonance? Maximum
what is the relationship between current through a resonant circuit and the voltage across the circuit? the voltage and current are in phase
what is the main advantage of using an op-amp audio filter over a passive LC audio filter? Op-amps exhibit gain rather that insertion loss
what are the characteristics of an inverting operational amplifier (op-amp) circuit? It has input and output signals 180 degrees out of phase
Gain of a closed-loop op-amp circuit is determined by ? The op-amp's external feedback network
which of the following op-amp circuits is operated open - loop? comparator
In the op-amp oscillator circuit shown in Figure 3D6, what would be the most noticeable effect if the capacitance of C were suddenly doubled? Frequency would be lower.
What frequency synthesizer circuit uses a phase comparator, look-up table, digital-to-analog converter, and a low-pass antialias filter? A direct digital synthesizer
A circuit that compares the output of a voltage-controlled oscillator (VCO) to a frequency standard and produces an error voltage that is then used to adjust the capacitance of a varactor diode used to control frequency in that same VCO is called what? Phase-locked loop.
RF input to a mixer is 200 MHz and the local oscillator frequency is 150 MHz. What output would you expect to see at the IF output prior to any filtering? 50, 150, 200 and 350 MHz.
What spectral impurity components might be generated by a phase-locked-loop synthesizer? Broadband noise.
In a direct digital synthesizer, what are the unwanted components on its output? Spurs at discrete frequencies.
What is the definition of a phase-locked loop (PLL) circuit? A servo loop consisting of a phase detector, a low-pass filter and voltage-controlled oscillator.
Given the combined DC input voltages, what would the output voltage be in the circuit shown in Figure 3D7? -5.5 V
Which lamps would be lit in the circuit shown in Figure 3D8? 2, 3, 4, 7 and 8.
What will occur if an amplifier input signal coupling capacitor fails open? No amplification will occur, with DC within the circuit measuring normal.
In Figure 3D9, determine if there is a problem with this regulated power supply and identify the problem. There is no problem with the circuit.
In Figure 3D10 with a square wave input what would be the output? 3
With a pure AC signal input to the circuit shown in Figure 3D11, what output wave form would you expect to see on an oscilloscope display? 2
Created by: pookee888