There are answers to questions about the analog circuits section of the basics of electronic technol

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Analog Electronic Technology

Summary. The answer to the circuit and analog electronic technology test questions is that fixed resistors can be divided into carbon film resistors, metal oxide film resistors, metal film resistors, and wirewound electricity.

resistors and chip resistors, etc.

Carbon film resistor: Carbon film resistor uses carbon film as the resistive material, on a small cylindrical ceramic insulating substrate, using dipping.

Staining or vacuum evaporation forms a crystalline resistive film (carbon film).

Circuit and analog electronics technology test questions answered.

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The answer to the circuit and analog electronic technology test questions is that fixed resistors can be divided into carbon film resistors, metal oxide film resistors, metal film resistors, wirewound resistors and chip resistors. Carbon film resistor: Carbon film resistor uses carbon film as the resistive material, and uses impregnation or vacuum evaporation to form a crystalline resistance film (carbon core file elimination film) on a small cylindrical ceramic insulating base modified body.

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Solution: t=0-, the circuit is in a steady state, and the capacitance is equivalent to an open circuit

There is no current and no voltage in the horizontal 4 resistor, so uc(0-)=10V.

When t=0+, according to the commutation theorem: uc(0+)=uc(0-)=10v. The capacitor is equivalent to a 10V voltage source, as shown in the figure below

t= , the capacitor is discharged, therefore: uc( )0.

Looking at the two ends of the capacitor, the circuit structure after the switch is:

So: r=4+4=8( ) The time constant of the circuit is: =rc=8 1=8(s).

Three-element method: uc(t)=uc( )uc(0+)-uc( )e (-t)0+(10-0)e (-t 8)=10e (v).

When t==8, uc(8)=10e(-1)=10.

The answer is 0v.

The analysis is as follows: careful observation can find that the circuit is actually 3 parts in parallel, in which the 6V power supply and VD2 are connected in series first, the 9V power supply and the resistor R are connected in series, and then the two series roads are connected in parallel with VD1 again; The anode of VD1 is connected with the positive terminal of the 6V power supply and the positive terminal of the 9V power supply respectively, and the cathode of VD1 is connected with the cathode of VD2 and one end of the resistor R respectively, so that the voltage of the output terminal is the voltage at both ends of VD1.

As can be seen from the figure, since the potential of the 9V power supply is significantly higher than the potential of the 6V power supply, the 9V power supply reversely charges the 6V power supply and turns VD1 on at the same time, and once VD1 conducts VD2 cathode potential to 9V, VD2 is reversed to the end. The loop path is: the current flows from the positive terminal of the 9V power supply to the positive terminal of VD1, and the positive terminal of VD1 comes out from the negative terminal of VD1, and the inflow resistor returns to the negative terminal of the 9V power supply through the resistance.

As mentioned before, VD1 and (9V power supply resistor R series branch) belong to the parallel relationship, VD1 is an ideal diode, so the voltage at both ends of the diode is 0 after turn-on, and the output voltage is the voltage at both ends of VD1, so it is 0V.

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3 The zero input response of a first-order circuit refers to the circuit response caused by the state of the circuit when the input is zero. The zero-state response of a first-order circuit is the circuit response caused by the input of the circuit when the state is zero.

4 The superposition theorem applies to linear circuits, and when calculating the current, voltage, and power of linear circuits, the following statement is correct (b).

a. It can be used to calculate current, voltage and power;

b. It can be used to calculate current and voltage, but not when calculating power;

c. It cannot be used when calculating current and voltage, but can be used when calculating power;

d. It cannot be used to calculate current, voltage and power.

5 The three characteristic quantities of a sinusoidal signal are (a).

a. Amplitude, initial phase angle, angular frequency.

b. Instantaneous value, amplitude value, effective value.

c. Phase angle, initial phase angle, angular frequency.

d. Phase angle, initial phase angle, phase difference.

6 Find the equivalent resistance Rab of the circuit in the figure below.

Simulation section. 1.According to the impurities doped into semiconductors, they can be divided into n-type semiconductors and p-type semiconductors, and most of the carriers in n-type semiconductors are free electrons.

2.The symbol of the diode is that it can only be typed and the main characteristic is that it is unidirectional conductive that is, forward conduction, reverse cut-off.

3.For the transistor to operate in the amplification region, its transmitting junction should be forward biased and the collector junction should be reversed.

4.Try the ** method to determine the static operating point ICQ and UCEQ of the circuit shown in Figure (A) below. Figure (b) shows the output characteristic curve of the transistor, and the ube(on) = v of the transistor.

5.How many types of distortion are there in a co-emission basic amplifier and how is it generated? Saturation distortion cut-off distortion.

6.What are the types of power amplifiers? What is Crossover Distortion? How can it be improved? Make the tube work in a critical conduction state.

7.The difference amplifier is set up to amplify the differential signal.

8.What is "imaginary shortness"?What is "virtual break"? Under the condition of amplifier plus depth negative feedback, the potential of the two input terminals is approximately equal, and the input current is approximately zero.

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When 12V is active, 1A is set to open the circuit, U'=12 x [3/(6+3) -12/(6+12)]=-4v

When 1a acts, 12V is set to short circuit, U"=-1 x [(3 and 6)+(12 and 6)]=-6v; u=u'+u"=-10v。