"High Frequency Electronic Circuits" New Edition Textbook-Practice Project

        This project is set up for the "High Frequency Electronic Circuits" course group of Tianjin University of Science and Technology, in conjunction with the courseware, handouts, textbooks and other related teaching materials. It is mainly to help learners verify the functions and technologies of circuit modules such as experiments, simulations, and course design. parameter.

Practical Project 1 Frequency Selective Network Test Circuit

Practice Project 2 High Frequency Small Signal Amplifier Test Circuit

        In the production of a typical single-stage high-frequency small-signal amplifier, color-coded inductors or I-shaped inductors can be sampled when the frequency is below 30MHz. In this design, the input side of the loop uses an inductor tap, while the output side uses a capacitor tap. It is very flexible to set the access coefficient. .

        DIP switches are connected in parallel at both ends of the loop to connect different loss resistors and change the quality factor of the loop. This allows us to intuitively appreciate the impact of the quality factor on the technical parameters of high-frequency small signal amplifiers.

        The transistor emitter uses a DIP switch to connect different emitter resistors, or the emitter resistor is bypassed with a capacitor to experience the impact of the emitter current on the technical parameters of the high-frequency small signal amplifier.

        The output end of the amplifier is connected to different load resistors using a dip switch, or it is open-circuit output to experience the impact of different loads on the technical parameters of high-frequency small signal amplifiers.

        The module power supply uses a choke coil to implement LC filtering to filter out power supply ripples, and the onboard LED serves as a power-on indicator light.

The overall schematic diagram of the circuit is as follows:

        The module PCB design uses top-layer wiring and bottom-layer copper laying to further improve high-frequency characteristics. The module PCB is shown in the figure below.

        The module is set with input terminals, output terminals and test terminals. UIN is connected to an external signal source (signal generator) to GND for signal input, +12V is connected to GND to an external +12V DC power supply, and UOUT is connected to an oscilloscope and other test equipment to GND as the output end. TP1, TP2 and TP3 are the test points of the transistor base, emitter, and collector respectively. The module layout is shown in the figure below.

Practical Project 3 High Frequency Power Amplifier Test Module

       The transistor emitter uses a DIP switch to connect different emitter resistors. At the same time, set a test point to observe the waveform of the emitter voltage, which is equivalent to observing the collector current pulse waveform and understanding the effects of different reverse bias voltages on high-frequency power amplifiers. Influence of work status.

        Use a DIP switch to connect the output end of the amplifier to different load resistors, or open the output to experience the impact of different loads on the working status of the high-frequency power amplifier.

        The module power supply uses a choke coil to implement LC filtering to filter out power supply ripples, and the onboard LED serves as a power-on indicator light.

The overall schematic diagram of the circuit is as follows:

        The module PCB design uses top-layer wiring and bottom-layer copper laying to further improve high-frequency characteristics. The module PCB is shown in the figure below.

        The module sets input terminals, output terminals and test terminals. UIN is connected to an external signal source (signal generator) to GND for signal input. +12V is connected to GND to an external +12V DC power supply. UOUT is connected to an oscilloscope and other test equipment as an output to GND. TP2 is The test point of the transistor emitter, the module layout is shown in the figure below.

Practice Project 4 XXX Test Module        

        Please click the editor in the upper right corner to open, open this project in the professional editor, and edit and modify the parameters, layout and wiring suitable for your project.

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