December 20, 2021, Xi'an - The TI Cup 2021 National Undergraduate Electronic Design Competition (hereinafter referred to as "Electronic Competition") award ceremony was held in Xi'an yesterday in a combination of online and offline forms. ...
1. In the circuit shown in the figure, it is known that ui=10sinωt V, US=5V, and the forward voltage drop of the diode can be ignored. Try to draw the waveform of the output voltage uo. (10 points) Answer: According to the unidirectional conductivity of the diode: When ui
I. Fill in the blanks with multiple choices. (30 points) 1. When the diode's pole potential is higher than the pole potential, it is called forward bias (N, P, S, B). When forward biased, the diode is in a state (cut-off, conducting), and the resistance presented at this time is very (large, small). 2. When the triode works in the amplification state, its......
I. Fill in the blanks (33 points, 1 point for each blank) 1. When a germanium diode is turned on, the voltage across its two ends is volts. When a silicon diode is turned on, the voltage across its two ends is volts. 2. The triode has three working states, which are,,. 3. The triode is a control element; the field effect tube is......
I. Fill in the blanks 1. A three-bit binary adder counter can record a maximum of ( ) pulses. If you want to record 12 pulses, you need ( ) triggers to form a ( )-bit counter. 2. The difference between a combinational logic circuit and a sequential logic circuit is ( ). 3. Complete the circuit that converts binary code into decimal numbers......
I. Fill in the blanks 1. Complete the conversion of the following numbers: (1) (375.236) 8 = ( ) 16 = ( ) 2 (2) (48A) 16 = ( ) 8 = ( ) 10 (3) (372) 8 = ( ) 16 = ( ) 2 (4) (11101.11) 2 = ( ) 10 = ( ) 16 2. When the outputs of the two OC gates are both high, the total output is......
I. Single-choice questions 1. The circuit shown in the figure ( ). A. It is a series crystal oscillator circuit, and the crystal is used as an inductor B. It is a parallel crystal oscillator circuit, and the crystal is used as an inductor C. It is a parallel crystal oscillator circuit, and the crystal is used as a capacitor D. It is a series crystal oscillator circuit, and the crystal is used as a capacitor 2. The circuit shown in the figure ( ). A. Can it generate a sine wave......
I. Multiple choice questions: 1. In a single-phase bridge rectifier circuit, if the load voltage Uo=18v and the load current Io=60mA are required, then the effective value of the transformer secondary voltage U2 is ( )v, the current ID flowing through each rectifier diode is ( )mA, and the withstand voltage UD is ( )v. You should choose ( ) A. U2 is 20, ID is 30, UD is 28.2 ......
1. Determine whether the following statements are correct, and use "×" or "√" to indicate the judgment result. (10 points) (1) In the operational circuit, both the non-inverting input terminal and the inverting input terminal are "virtual ground". ( ) (2) Voltage negative feedback stabilizes the output voltage, and current negative feedback stabilizes the output current. ( ......
I. Multiple choice questions (20 points) 1. In order to increase the output resistance, ( ) should be introduced into the amplifier circuit; in order to widen the bandwidth, ( ) should be introduced into the amplifier circuit. A. Current negative feedback B. Voltage negative feedback C. DC negative feedback D. AC negative feedback 2. In the bridge type (Wien bridge) RC sine wave oscillation circuit ( ). AφA=-1800, φF=+1800 ......
I. Multiple choice questions (10 points) 1. LM386 is an integrated power amplifier, which can change the voltage amplification factor in ( ). A 0-20 B 20 -200 C 200-1000 2. The differential amplifier circuit is set up for ( ). A stabilize Au B amplify the signal C suppress zero drift 3. KMCR is a differential......
I. Multiple choice questions (2 points for each question, 20 points in total) 1. When a transistor is working at a high current, as Ic increases, the β value will ( ). A. increase B. decrease C. remain unchanged 2. The potentials of the transistors in a certain circuit are 3V, 2.3V, and 12V respectively. The three electrodes of the transistor are ( ), and the tube is ( ) type. ......
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I. Fill in the blanks (16 points) 1. It is known that the open-circuit output voltage of the two amplifier circuits A and B is 5V, the short-circuit output current of circuit A is 2mA, and the output voltage of circuit B is 2.5V when it is connected to 5.1kW. Then the output resistance of circuit A is and the output resistance of circuit B is. 2. A three-phase amplifier working in the amplification area......
I. Judgement (10 points) 1. The physical process of avalanche breakdown and Zener breakdown is the same. ( ) 2. The integrated voltage regulator 78XX series outputs a forward voltage. ( ) 3. The doping concentration in the voltage regulator diode is higher than that of ordinary diodes. ( ) 4. Both thermal breakdown and electrical breakdown processes are reversible. ( ) 5. For triodes......
1: Draw the symbols of the following components (30 points) Resistor Variable resistor Thermistor Photoresistor Varistor Gas sensor Humidity resistor Bridge diode Zener diode Light-emitting diode Photosensitive diode Bidirectional diode Rectifier bridge Varactor NPN transistor PNP transistor N-channel junction......
I. Judgement (10 points) 1. Semiconductors that are mainly free electrons are called N-type semiconductors. ( ) 2. The characteristic of analog signals is that the signals are continuous in time and amplitude. ( ) 3. PN junctions have unidirectional conductivity characteristics. ( ) 4. The differential amplifier circuit structure can suppress the zero drift phenomenon. ( ) 5. AC amplifier......
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