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What value should a resistance Rs inserted in the source lead have to reduce the overall voltage gain to -5 V/V?
A MOSFET connected in the CS configuration has a trans conductance gm = 5 mA/V.
What value of Rs is needed to obtain an overall voltage gain of -16 V/V?
If the peak voltage of the sine wave appearing between base and emitter is to be limited to 5 mV, what vˆsig is allowed, and what output voltage signal.
If the total resistance in the collector is 6 kO , find the overall voltage gain Gv and the peak amplitude of the output signal vo.
Inclusion of an emitter resistance Re reduces the variability of the gain Gv due to the inevitable wide variance in the value of ß.
What is the input resistance of the amplifier? What is the overall voltage gain Gv ?
When a 100-O istance was added in series with the signal generator the overall voltage gain decreased to 10 V/V.
If the maximum signal amplitude of the voltage between base and emitter is limited to 10 mV, what are the corresponding amplitudes of vsig and vo?
At what current IC should the transistor be biased for the input resistance Rin to equal that of the signal source?
Find the dc voltage at the Collector, the amplitude of the output voltage signal, and the voltage gain.
Show that the input resistance between base and emitter, looking into the base, is equal to rp .
Your circuit should show the values of all components, including the model parameters. What is the input resistance Rin?
Find the input resistances Rib and Rin and the overall voltage gain vo/vsig .
Grounded-base circuits of this kind are used in systems such as cable TV, in which, for highest-quality signaling, load resistances need to be matched.
The power supplies available are ±5 V. The input signal source has a resistance of 50 O , and it is required that the amplifier input resistance match .
Assuming that ß is very large, find the collector bias current IC. Replace the transistor with the small-signal equivalent-circuit model.
An amplifier with an input resistance of 100 kO, an open-circuit voltage gain of 100 V/V, and an output resistance of 100O is connected between a 20-kO .
If the load resistance changes from the nominal value of 2 kO to a low value of 1 kO, the change in output voltage is limited to 5% of nominal value.
Sketch iC -vCE characteristic curves for the BJT for iB = 10 µA, 20 µA, 30 µA, and 40 µA.
If the input signal causes a sinusoidal signal of 30-µA peak amplitude to be superimposed on IB, find the corresponding signal components of iC and vCE.
If in a particular application Vgs is 10 mV, find the minimum overdrive voltage at which the transistor should be operated so that the second-harmonic .
If a 0.02-V signal is superimposed on VGS, find the corresponding increment in collector current by evaluating the total collector current iD and subtracting.
An NMOS amplifier is to be designed to provide a 0.20-V peak output signal across a 20-k_ load that can be used as a drain resistor.
In the table below, for MOS transistors operating under a variety of conditions, complete as many entries as possible.