Southern University of Science and Technology 2023 Master's Degree Entrance Examination Outline
Examination Subject Code: 808
Exam Subject Name: Comprehensive Electronic Science and Technology General
Description: The structure of the Comprehensive Electronic Science and Technology test paper is two questions on analog circuits, two questions on digital circuits, and two questions on signals and systems. There are six questions in total, each question is worth 30 points. , candidates can choose any five questions to answer.
1. Examination requirements
(1) Analog circuits: Comprehensively and systematically master the basic concepts and basic laws of analog circuits, and be able to apply them flexibly. Pay attention to integrating theory with practice, and have strong abilities to analyze and design analog circuits.
(2) Digital circuits: Comprehensively and systematically master the basic concepts, principles, analysis ideas and design methods of digital circuits, as well as the practical application of related devices and circuits in logic circuit design; be able to flexibly use relevant knowledge to analyze and solve more comprehensive problems question.
(3) Signals and systems: Comprehensively and systematically master the basic concepts, principles, and analysis methods of signals and systems, and be able to apply them flexibly. Pay attention to integrating theory with practice, and have strong theoretical application capabilities.
2. Exam content
(1) Analog circuit:
a. Semiconductor basics: the formation of PN junction, the volt-ampere characteristics of PN junction, the unidirectional conductive performance of PN junction, the volt-ampere characteristics, main parameters and simple applications of semiconductor diodes and triodes, the current amplification principle of bipolar transistors, volt-ampere characteristics Ampere characteristics and its main parameters, voltage amplification principle of field effect tube, volt-ampere characteristics and its main parameters.
b. Basic amplification circuits: the concepts of common emitter, common collector, common base amplifier circuits and field effect tube amplifier circuits; the working principles and analysis methods of common emitter, common collector, common base amplifier circuits and field effect tube amplifier circuits; common emitter There are three basic connection methods of amplifier circuits in three configurations: , common base and common set.
c. Multi-stage amplifier circuit: coupling method of multi-stage amplifier circuit, dynamic analysis of direct coupling circuit, zero-drift suppression circuit, static and dynamic parameter calculation of differential amplifier circuit, complementary output stage circuit, and multi-stage amplifier circuit.
d. Integrated operational amplifier circuit: The composition and voltage transmission characteristics of integrated operational amplifier, mirror current source and derivative circuit, simple analysis and judgment of integrated operational amplifier circuit.
e. Frequency response of the amplifier circuit: the amplitude-frequency characteristics and phase-frequency characteristics of the amplifier circuit, the reasons that affect the frequency characteristics of the circuit and the high-frequency equivalent analysis model, and the representation method of the frequency response by the Bode diagram.
f. Feedback in amplification circuits: basic concepts and ideas of feedback, basic configuration and determination methods of negative feedback, analysis methods of deep negative feedback circuits, and the impact of negative feedback on the performance of amplifier circuits.
g. Signal arithmetic and processing: basic arithmetic circuits, analog multipliers and their applications in arithmetic circuits; active filter circuits; other practical amplifier circuits.
h. Waveform generation and signal conversion: sine wave oscillation circuit, voltage comparator, non-sinusoidal wave generation circuit, signal conversion based on integrated operational amplifier.
(2)Digital circuit:
a. Number system and coding system: basic concepts such as number system, source code, complement code, complement code, etc.; the principle of using complement code to perform signed addition operation; understand the commonly used encoding types.
b. Basics of logical algebra: basic operations, basic laws and theorems of logical algebra; description methods of logical problems, representation of logical functions; simplification (algebraic method and Karnaugh map method) and transformation of logical functions.
c. Gate circuit: Logic functions, external characteristics and usage methods of TTL gate circuit and CMOS gate circuit.
d. Combinational logic circuits: characteristics, analysis and design methods of combinational logic circuits; logical functions and usage methods of commonly used integrated combinational logic devices.
e. Trigger: Action characteristics, logical function classification and description of the trigger.
f. Sequential logic circuits: characteristics, analysis and design methods of synchronous sequential logic circuits; logical functions and usage methods of commonly used integrated sequential logic devices.
g. Semiconductor memory: working principle, classification and respective characteristics of semiconductor memory; principles and methods of designing combinational logic circuits using memory.
h. Pulse waveform generation and shaping: Schmitt trigger, monostable trigger, multivibrator characteristics and applications; 555 timer principle and application.
i. Digital-to-analog and analog-to-digital conversion: working principle of D/A converter: comparison of A/D converter types and comprehensive performance indicators; conversion accuracy and speed of D/A and A/D converters and the main factors that affect them factor.
(3) Signals and systems:
a. Signals and systems: continuous time signals, discrete time signals, basic operations of signals, periodic signals, odd signals, even signals, complex exponential signals, unit impulse function, unit step function, continuous time system, discrete time system, Classification and properties of systems.
b. Linear time-invariant systems: convolution of continuous-time and discrete-time signals, properties of linear time-invariant systems, differential/difference equation representation of causal linear time-invariant systems.
c. Fourier series: Fourier series and its convergence of continuous time periodic signals, properties of Fourier series of continuous time periodic signals, Fourier series of discrete time periodic signals, discrete time period Fourier series properties of signals.
d. Continuous time Fourier transform: Fourier transform of non-periodic signals, Fourier transform of periodic signals, convergence of Fourier transform, properties of Fourier transform, convolution and product properties of time domain, The system is represented by a linear constant coefficient differential equation.
e. Discrete time Fourier transform: Fourier transform of non-periodic signals, Fourier transform of periodic signals, properties of Fourier transform, convolution and product properties of time domain, linear constant coefficient difference equation representation of the system .
f. Sampling: impulse train sampling, zero-order hold, first-order hold, sampling and signal reconstruction, sampling theorem, under-sampling, discrete-time processing of continuous-time signals, sampling of discrete-time signals.
3. Exam time
180 minutes, full score: 150 points.
4. Bibliography
(1) Analog circuits:
"Fundamentals of Analog Electronic Technology" (Fourth Edition), edited by Tong Shibai and Hua Chengying, Higher Education Press, 2006.
(2) Digital circuits:
"Basics of Digital Electronic Technology" (Sixth Edition), edited by Yan Shi, Higher Education Press, April 2016.
(3) Signals and Systems:
Alan V. Oppenheim, and Alan S. Willsky. Signals and Systems (2nd Edition). Prentice Hall, 1996. ISBN: 9780138147570.