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When operated at a base-emitter voltage of 0.75 V, have collector currents of 0.5 mA and 2 mA. Find IS for each device. What are the relative junction areas
In a particular technology, a small BJT operating at Vbe = 30VT conducts a collector current of 200 µA. What is the responding saturation current?
Two transistors have EBJ areas as follows: AE1 = 200 µm × 200 µm and AE 2 = 0.4 µm × 0.4 µm. If the two transistors are operated in the active mode
Find the collector currents that you would expect for operation at vBE = 700 mV for transistors for which IS = 10-13 A and IS = 10-18 A.
Consider the half-wave rectifier circuit of Fig. with the diode reversed. Let vS be a sinusoid with 10-V peak amplitude, and let R = 1 kO
Consider a half-wave rectifier circuit with a triangular-wave input of 5-V peak-to-peak amplitude and zero average, and with R = 1 kO.
What is the peak voltage of the rectified output? For what fraction of a cycle does each diode conduct? What is the average output voltage?
A full-wave bridge-rectifier circuit with a 1-kO load operates from a 120-V (rms) 60-Hz household supply through a 12-to-1 step-down transformer
Augment the rectifier circuit of Problem 4.70 with a capacitor chosen to provide a peak-to-peak ripple voltage of
It is required to use a peak rectifier to design a dc power supply that provides an average dc output voltage of 12 V on which a maximum of 1-V ripple
Consider a half-wave peak rectifier fed with a voltage vS having a triangular waveform with 24-V peak-to-peak amplitude, zero average, and 1-kHz frequency
Consider the circuit in Fig. with two equal filter capacitors placed across the load resistors R.
The op amp in the precision rectifier circuit of Fig is ideal with output saturation levels of 13 V
Sketch the transfer characteristic vO versus vI for the limiter circuits shown in Fig. All diodes begin conducting at a forward voltage drop of 0.5 V
The circuits in Fig (a) and (d) are connected as follows: The two input terminals are tied together, and the two output terminals are tied together
In the circuit shown in Fig, I is a dc current and vs is a sinusoidal signal. Capacitors C1 and C2 are very large; their function is to couple the signal
Consider the voltage-regulator circuit shown in Fig. The value of R is selected to obtain an output voltage VO (across the diode) of 0.7 V.
In the circuit shown in Fig, diodes D1 through D4 are identical, and each exhibits a voltage drop of 0.7 V at a 1-mA current.
We investigated the operation of the circuit in Fig. for small input signals. In problem we wish to find the voltage-transfer characteristic (VTC) vO versus vI
Consider the voltage-regulator circuit shown in Fig under the condition that a load current IL is drawn from the output terminal.
A particular design of a voltage regulator is shown in Fig. Diodes D1 and D2 are 10-mA units; that is, each has a voltage drop of 0.7 V at a current of 10 mA.
Partial specifications of a collection of zener diodes are provided below. For each, identify the missing parameter and estimate its value
The small-signal model is said to be valid for voltage variations of about 5 mV. To what percentage current change does this correspond?
In a particular circuit application, ten "20-mA diodes" (a 20-mA diode is a diode that provides a 0.7-V drop when the current through it is 20 mA)
A designer requires a shunt regulator of approximately20 V. Two kinds of zener diodes are available: 6.8-V devices with rz of 10O and 5.1-V devices