High Frequency Small Signal Tuned Amplifier Course Design 30

Summary. According to the introduction of the new system's characteristic modular textbook "Concise Course of Analog Electronic Technology" (Yuan Zengmin), the working point is adjusted to the critical position, that is, the optimal position, and the output range of the basic common injection amplifier is ignored when the BJT saturation voltage drop is ignored.

UOM(max)=[RC RL) (RC+RC RL)]UCC input range is equal to the output range divided by the voltage amplification.

In the high-frequency small-signal tuning amplifier experiment, what is the approximate dynamic range of the amplifier.

According to the introduction of the new system's characteristic modular textbook "Concise Course of Analog Electronic Technology" (Yuan Zengmin), the working point is adjusted to the critical position of Xiangze, that is, the best position, and when the BJT saturation voltage drop is ignored, the basic co-injection amplifier input range UOM(max)=[RC RL) (RC+RC RL)]UCC input range is equal to the output range of the hole divided by the voltage amplification factor.

Hope it helps.

The rectangular coefficient of a small-signal tuned amplifier is band 1, ideally equal to 1.

The high-frequency power amplifier is the transmitter part of the communication wireless system, the most important function is to amplify the high-frequency signal as much as possible, the ultimate goal is to output the signal generated by the high-efficiency high-power oscillator in the transmitter is very small, in order to obtain a larger power Ling, it is necessary to use a power multi-stage amplifier to achieve, through the antenna to radiate out. The main input signal is a large signal, usually above, sometimes between 1-2V, and in larger cases, it is concluded that the operating range of the high-frequency amplifier is a nonlinear transistor, and the analysis can only be carried out under these similar conditions. High-frequency small-signal amplifiers and high-frequency power amplifiers are widely used in communication electronic systems.

Through the analysis and comparison between the two, we have a clearer understanding of the scope of application and the use characteristics of high-frequency small-signal amplifiers. In the equipment of the ruler and receiver, the signal sensed by the antenna is generally very weak, usually at the microvolt level.

The current control effect of the triode or the voltage control effect of the FET can be used to convert the power of the power supply into a current that changes according to the input signal triode number. Because the sound is a wave of different amplitudes and different frequencies, that is, the AC signal current, the collector current of the triode is always the times of the base current, is the AC amplification of the triode, the application of this, if the small signal is injected into the base, the current flowing through the collector will be equal to the times of the base current, and then this signal is isolated by a DC-blocking capacitor, and the current (or voltage) is obtained is a large signal that is times the original time, and this phenomenon becomes the amplification effect of the triode. After continuous current and voltage amplification, the power amplification is completed.

The signal received by the radio contains useful signals, signal interference and noise, and the function of the input circuit is to filter out useful signals and filter out noise and interference. The function of the amplification circuit is to amplify the noise as much as possible under the minimum conditions, and to have a wide enough straight field. The function of the output circuit is to implement and match the impedance of frequency selection inspection, and the circuit is designed according to the requirements of these parts, and the center frequency is usually between a few hundred kilohertz and megahertz, and the broadband frequency is between several thousand hertz and tens of megahertz.

Because the high-frequency small-signal amplifier is relatively small, it will be within the linear operating range, that is, in the working state of the amplification line. The load used in high-frequency small-signal amplifiers is a resonant loop, which means that a large gain is generated when the signal is close to the resonant frequency.