65001. The feedback signal in a(n) ________ oscillator is derived from a capacitive voltage divider in the LC circuit.
65002. Refer to this figure. This circuit is
65003. This circuit is a ________ oscillator.
65004. Sinusoidal oscillators operate with ________ feedback.
65005. Referring to this figure, calculate the voltage gain with the feedback for the following circuit values: RD = 4 k, RS = 1 k, RF = 15 k, and gm = 5000 μS.
65006. Refer to this figure. Calculate the resonant frequency.
65007. Which of the following is required for oscillation?
65008. A circuit that can change the frequency of oscillation with an application of a dc voltage is sometimes called
65009. In order to start up, a feedback oscillator requires
65010. Refer to this figure. If C1 increases in value, the resonant frequency will
65011. What is the ratio of the input impedance with series feedback to that without feedback?
65012. The amplifier is unstable if the Nyquist curve plotted encloses (encircles) the –1 point, and it is stable otherwise.
65013. Which of the following oscillators is (are) tuned oscillators?
65014. What is the ratio of the output impedance with series feedback to that without feedback?
65015. Refer to the given figure. This circuit is known as
65016. Refer to this figure. Determine the frequency of oscillation, if any.
65017. Referring to this figure, calculate the amplification gain where the op-amp gain (A) is 200,000, R1 = 1.5 k, and R2 = 400 .
65018. Referring to this figure, calculate the voltage gain with feedback Avf.
65019. One condition for positive feedback is that the phase shift around the feedback loop must be ________°.
65020. At what phase shift is the magnitude of A at its minimum in the Nyquist plot?
65021. Determine the output impedance with feedback for a voltage-series feedback having A = –100, R1 = 15 k, Ro = 20 k, and a feedback of = –0.25.
65022. Determine the voltage gain with feedback for a voltage-series feedback having A = –100, R1 = 15 k, Ro = 20 k, and a feedback of = –0.25.
65023. Calculate the resonant frequency of this Wien bridge oscillator if R1 = 25 k, R2 = 40 k, C1 = 0.001 F, and C2 = 0.002 F.
65024. The Nyquist plot combines the two Bode plots of gain versus frequency and phase shift versus frequency on a single plot.
65025. Calculate the resonant frequency of this oscillator.
65026. What is the total phase shift requirement, around the feedback loop, for a phase-shift oscillator?
65027. An input signal is needed for an oscillator to start.
65028. Referring to this figure, calculate the amplification gain with feedback for the following circuit values: R1 = 80 k, R2 = 20 k, Ro = 10 k, RD = 61 k, and gm = 4000 μS.
65029. The lead-lag circuit in the Wien-bridge oscillator has a resonant frequency at which the attenuation is
65030. The start-up gain of an oscillator must be ________ one.
65031. Refer to this figure. What is the duty cycle, if any?
65032. In the IC phase-shift oscillator, what should the ratio of feedback resistor Rf to R1 be?
65033. At series resonance, the impedance of a crystal is
65034. For frequencies up to 1 MHz, the ________ is the most widely used type of sinusoidal RC oscillator.
65035. The twin-T oscillator produces a ________ response.
65036. What is the typical value of quality factor for crystal oscillators?
65037. Which of the following improvements is (are) a result of the negative feedback in a circuit?
65038. In the Wien bridge oscillator, which of the following is (are) frequency-determining components?
65039. Determine the input impedance with feedback for a voltage-series feedback having A = –100, R1 = 15 k, Ro = 20 k, and a feedback of = –0.25.
65040. A certain oscillator has a tap on the inductor in the tank circuit. This oscillator is probably
65041. At parallel resonance, the impedance of a crystal is
65042. Refer to this figure. Assuming it is configured as an oscillator and if you desired to reduce the duty to less than 50%, the following circuit change would need to be made.
65043. Calculate the fr of a lead-lag network if R1 = R2 = 6.8 k, and C1 = C2 = 0.05 F.
65044. Which of the following is (are) feedback?
65045. What is the relationship between the series and parallel resonant frequencies of a quartz crystal?
65046. An op-amp integrator has a square-wave input. The output should be
65047. The frequency distortion arising because of varying amplifier gain with frequency is considerably reduced in a negative-voltage feedback amplifier circuit.
65048. An amplifier is stable if the absolute magnitude of A is ________.
65049. ________ is a frequency-determining component in a unijunction oscillator.
65050. In the Colpitts oscillator, the elements X1 and X2 are ________ and X3 is a(n) ________.
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