Current injection type class E power amplifier

Abstract

The invention discloses a current injection type class E power amplifier which comprises a current source, a radio frequency choke coil, a switching circuit, an auxiliary current injection circuit, apassive matching circuit and a load resistor. The switch circuit is composed of two cascode NMOS tubes, controls the on and off of one NMOS tube according to the level of an input switch signal. The auxiliary current injection circuit injects the direct-current input current and the output current generated by the power amplifier into the load resistor together according to the high-level controlof the injection control signal when the MOS tube is switched off; and meanwhile, the discharge path is closed according to the low level of the discharge control signal, injecting current is controlled to stop according to the low level of the injection control signal when the NMOS tube is conducted, and meanwhile, the discharge path is opened according to the high level of the discharge controlsignal. An external injection mode is adopted for power improvement, a traditional E-type structure and a traditional working mode are not broken through, and meanwhile the theoretical output power limit value is broken through.

Description

technical field [0001] The invention relates to a current injection type E class power amplifier, which belongs to the technical field of radio frequency power amplifiers. Background technique [0002] Since Sokal et al. proposed Class E power amplifier in 1975, people have done a lot of research on it. as attached figure 1 As shown, the ideal class E power amplifier is composed of an active device as a switch, a radio frequency choke coil, a charging and discharging capacitor connected in parallel with the switch, a resonant network and a load. For any load resistor R, under the premise of an ideal 100% drain efficiency, its output power is uniquely determined by the power supply voltage, as shown in formula (1): [0003] [0004] However, in actual situations, due to the non-ideality and parasitic effects of transistor switches, as well as the low Q value of on-chip passive devices, it is difficult to achieve the ideal 100% output efficiency, and the output power afte...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, provide a current injection type E power amplifier, solve the problem that the output power of the traditional E power amplifier is limited by the power supply voltage, without increasing the power supply voltage and changing Under the premise of optimal load resistance, the output power is increased through auxiliary current directional injection technology

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