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应用一些设计LC网路的简便方法,可以设计出更高功率的高频晶体管放大器.在高频放大器中,用一只晶体管不能提供所需要的输出功率时,就必须在电路中再接入一些器件,或者采用多级放大,使用更大功率的晶体管以改进散热和提高可靠性.在这种情况下,设计人员的任务是要选择一种有效而且经济的晶体管电路.特高频电路的选择,包括选用变压器,采用某种混合偶合方法和利用一般的LC网路.下面的讨论,提供了一种简单经济的制作方法,而且效率很高.常遇到的困难是两个晶体管直接并联时,其负载分配不均匀,而且要在阻抗极低的情况下进行匹配.克服这一点,最简单是在输入和输出匹配网路中采用分信号方法.
Some simple methods of designing an LC network can be used to design higher-power high-frequency transistor amplifiers, where one transistor can not provide the required output power and then must be re-inserted into the circuit Devices, or use multi-stage amplification, use more powerful transistors to improve heat dissipation and improve reliability.In this case, the designer’s task is to choose an effective and economical transistor circuit. The choice of UHF circuit , Including the use of transformers, the use of some hybrid coupling methods, and the use of general LC networks. The following discussion provides a simple and economical method of fabrication and is highly efficient. The difficulty often encountered when two transistors are connected in parallel , The load distribution is not uniform, but also in the case of very low impedance match.To overcome this point, the simplest is the input and output matching network using sub-signal method.