What is the basic working principle of the Patch Launch Tube? How does it achieve the function of signal transmission or amplification in the circuit?
Publish Time: 2024-05-20
The basic working principle of Patch Launch Tube (usually refers to RF or microwave transmitting tubes in patch packages, such as patch diodes or patch triodes) has nothing to do with its packaging form, but is based on the electrical properties of semiconductor materials.Basic working principle:The basic working principle of Patch Launch Tube (taking triode as an example) is based on three main parts: emitter, base and collector. By controlling the current (or voltage) between the base and the emitter, the current flowing from the emitter to the collector can be adjusted.When there is no input signal to the base (that is, the bias voltage is zero or very small), the current between the emitter and the collector (called leakage current) is very small.When there is a positive input signal to the base, it will forward bias the PN junction between the emitter and the base, causing electrons to be injected from the emitter to the base. Because the base is very thin, most of these electrons will quickly cross the base to the collector, forming a collector current. The change in the base current controls the change in the collector current, achieving current amplification.Implementation of signal transmission or amplification function in the circuit:In the transmitting circuit, the Patch Launch Tube is usually used in combination with a resonant circuit (such as an LC resonant circuit). By adjusting the parameters of the resonant circuit to match the frequency response of the transmitting tube, the RF signal generated by the transmitting tube can be effectively radiated into space.In the amplification circuit, the patch launch tube is used as an amplifier. The input signal is added to the base of the transmitting tube through a coupling circuit and output from the collector after amplification. By cascading multiple amplifiers or using technologies such as feedback circuits, higher amplification factors and better performance can be achieved.It should be noted that the specific working principle and circuit implementation of the patch launch tube may vary depending on the specific application scenario and device type. In addition, in order to achieve the best performance and stability, the circuit needs to be carefully designed and optimized.
