- An amplifier has a gain-bandwidth product of 200 MHz. A feedback network is added that has a feedback factor (1 + βA) of 18.88. What is the gain-bandwidth product for the circuit with the added feedback network? （ ）
- The output impedance of current-shunt feedback amplifier （ ） the output impedance of its op-amp.
- Calculate the voltage gain for voltage series feedback when the amplifier gain is A = -2000 and F = -1/50. （ ）
- The power that an amplifier delivers to a load is equal to the difference between the power that the circuit draws from the power supply and the power that the circuit dissipates.（ ）
- Power amplifiers are typically used to drive low impedance loads.（ ）
- The maximum theoretical efficiency of an RC-coupled class A amplifier is （ ）.
- Crossover distortion in class B amplifiers is prevented by （ ）.
- A class B amplifier (not push-pull) （ ）.
- A second order low-pass filter has a high-end roll-off of （ ）.
- A summing integrator is an op-amp integrator that has （ ）.
- The bandwidth of an amplifier is （ ）.
- When a given op-amp has a common-mode input of 10 V, the output of the device is 10 V. When the device has a differential input of 2 mV, the output of the device is 10 V. What is the CMPR of the device? （ ）
- The inverting and noninverting inputs to an op-amp are used to drive a(n) （ ） amplifier.
- The operational amplifier will only slightly amplify signals （ ）.
- An amplifier has a midband power gain of 24,500. What is the value of the power gain in dB for the circuit? （ ）
- Negative dB values represent （ ）.
- A 3-dB drop in β occurs at （ ）.
- If several identical stages of amplifiers, each having the exact same upper and lower cutoff frequencies, are connected in cascade, then the bandwidth of the resulting amplifier will （ ）.
- The （ ） FET amplifier has low input impedance, high output impedance, and high voltage gain.
- The （ ） amplifier has high input impedance, low output impedance, and low voltage gain.
- The FET version of the BJT's common-emitter configuration is the （ ） circuit.
- A JFET can be biased in several different ways. The common method(s) of biasing an n-channel JFET is(are) （ ）.
- The primary difference between JFETs and depletion-type MOSFETs is （ ）.
- Which of the following biasing circuits can be used with E-MOSFETs? （ ）
- Generally, it is good design practice for linear amplifiers to have operating points that close to （ ）.
- FETs usually （ ）.
- In the family of FETs, you can expect to find （ ）.
- The region of the JFET drain curve that lies between pinch-off and breakdown is called （ ）.
- Shockley's equation defines the （ ） of the FET and are unaffected by the network in which the device is employed.
- The voltage gain of a very well-designed common collector amplifier configuration, using a pnp transistor, is （ ）.
- A transistor amplifier has an input signal applied to its emitter terminal and an output signal taken from its collector terminal. The amplifier is a(n) （ ）.
- Voltage-divider bias stability is （ ）.
- The term quiescent means （ ）.
- The difference between the resulting equations for a network in which an npn transistor has been replaced by a pnp transistor is （ ）.
- When a BJT is biased in the cutoff region the collector-to-emitter voltage is typically equal to （ ）.
- The condition where increase in bias current will not cause further increases in collector current is called （ ）.
- BJTs are commonly used as （ ）.
- In the active region, the base-emitter junction （ ）.
- The Zener diode must be operated such that （ ）.
- Which of the following circuits is used to eliminate a portion of a signal? （ ）.
- What is the value of the voltage dropped across forward-biased silicon diodes that are connected in parallel with each other? （ ）.
- When a p-n junction is reverse-biased, its junction resistance is （ ）.
- The piecewise linear model, equivalent circuit of the diode consists of （ ）.
- When a diode is doped with either a pentavalent or a trivalent impurity its resistance will （ ） .
- The characteristic of an ideal diode are those of a switch that can conduct current（ ） .
- Which of the following is not a commonly used semiconductor material'? （ ）
答案:200 MHz
答案:is increased when compared to
答案:input impedance with feedback 410 kΩ
答案:-48.78
答案:voltage series feedback
答案:对
答案:对
答案:25%
答案:biasing the transistors slightly above cutoff
答案:conducts through 180° of the input waveform
答案:high-pass filter
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