Dual-passband power amplifier integrated with filter

Abstract

The invention discloses a dual-passband power amplifier integrated with a filter. One end of an inductor L1 is connected with a negative voltage, while the other end of the inductor L1 is connected with one end of a microstrip line R1 and one end of a capacitor C1; the other end of the microstrip line R1 is connected with the grid of a transistor M, and the other end of the capacitor C1 is earthed; one end of an inductor L2 is connected with a positive voltage, while the other end of the inductor L2 is connected with one end of a microstrip line R2 and one end of a capacitor C2; the other endof the microstrip line R2 is connected with the source of the transistor M; the other end of the capacitor C2 is earthed. One end of an input matching network is connected with the grid of the transistor M; the other end of the input matching network is connected with one end of a capacitor C3; the other end of the capacitor C3 is connected with a 50-Ohm port impedance Z1 to serve as a signal input end. According to the dual-passband power amplifier integrated with the filter, a dual-passband filter is integrated at the output stage of the transistor via an integrating thought, so that a dual-passband output circuit integrated with matching and filtering functions is acquired, meanwhile, the matching circuit can be omitted, so that the amplifier can be directly connected with the filter, and meanwhile the matching function is completed.

Description

technical field [0001] The invention relates to the technical field of electronic information, in particular to a filter-integrated dual-passband power amplifier. Background technique [0002] The traditional dual-band power amplifier is mainly realized by impedance matching in two different frequency bands, which often makes the circuit structure more complicated, and the designed dual-band power amplifier has poor isolation between bands. Moreover, it is usually necessary to add a filter after the power amplifier to filter out the interference and influence on the receiver caused by various harmonics and intermodulation components brought by the nonlinearity of the amplifier. The traditional method is to connect the filter module separately after the power amplifier module, so that the connecting wires and adapters introduced between the power amplifier and the filter will not only increase the damage of the circuit, but also cause a large increase in the circuit size, thu...

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Problems solved by technology

[0006] Studies have shown that in the design of dual-pass band power amplifiers, the design method of the traditional concurrent dual-band band matching circuit is cumbersome and the isolation between the bands is poor, and the non-concurrent matching circuit based on RF switches has a large insertion loss. It is difficult to achieve a concurrent system with a small insertion loss and ensure good inter-band isolation at the same time.

Moreover, after these designed power amplifier modules, a separate external filter module is required to filter out the interference and response of various harmonics and intermodulation components to the receiver caused by the non-linearity of the amplifier, resulting in increased circuit volume and size, and increased circuit damage. Big

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