A radio frequency circuit, comprising a first circuit (201, 401) and a second circuit (202, 402), wherein: the first circuit (201, 401) is configured to: receive a first signal and a second signal, wherein the first signal and the second signal are obtained by performing phase decomposition on a modulated signal, wherein a phase of the first signal is φ ( t), a phase of the second signal is -φ ( t), a value of φ ( t) ranges from 0° to 90°, an amplitude of the first signal is equal to an amplitude of the second signal, φ ( t) is a time-related function, t≥0, and t indicates time; split the first signal into a third signal and a fourth signal, and split the second signal into a fifth signal and a sixth signal; adjust a phase of the fifth signal to obtain a seventh signal; and combine the seventh signal and the third signal into an eighth signal; the first circuit (201, 401) further comprises a microstrip, the microstrip is configured to adjust the phase of the fifth signal, and a length of the microstrip is directly proportional to a phase shift of the fifth signal; and the second circuit (202,402) comprises a primary power amplifier branch and a secondary power amplifier branch, the primary power amplifier branch comprises an outphasing circuit, the secondary power amplifier branch comprises a secondary power amplifier, the outphasing circuit is configured to process the fourth signal and the sixth signal, and the secondary power amplifier is configured to process the eighth signal, wherein the eighth signal is input from a signal input end of the secondary power amplifier; and wherein if an amplitude of the eighth signal reaches a signal threshold, the secondary power amplifier is configured to be started to perform amplification processing on the eighth signal, wherein the signal threshold is a minimum signal amplitude required to start the secondary power amplifier, wherein the signal threshold corresponds to a conduction angle, and a value of the conduction angle of the secondary power amplifier is greater than 120°, wherein the amplitude of the eighth signal is configured to be adjusted by adjusting different phases of the fifth signal. the first circuit (201, 401) is configured to: receive a first signal and a second signal, wherein the first signal and the second signal are obtained by performing phase decomposition on a modulated signal, wherein a phase of the first signal is φ ( t), a phase of the second signal is -φ ( t), a value of φ ( t) ranges from 0° to 90°, an amplitude of the first signal is equal to an amplitude of the second signal, φ ( t) is a time-related function, t≥0, and t indicates time; split the first signal into a third signal and a fourth signal, and split the second signal into a fifth signal and a sixth signal; adjust a phase of the fifth signal to obtain a seventh signal; and combine the seventh signal and the third signal into an eighth signal; the first circuit (201, 401) further comprises a microstrip, the microstrip is configured to adjust the phase of the fifth signal, and a length of the microstrip is directly proportional to a phase shift of the fifth signal; and the second circuit (202,402) comprises a primary power amplifier branch and a secondary power amplifier branch, the primary power amplifier branch comprises an outphasing circuit, the secondary power amplifier branch comprises a secondary power amplifier, the outphasing circuit is configured to process the fourth signal and the sixth signal, and the secondary power amplifier is configured to process the eighth signal, wherein the eighth signal is input from a signal input end of the secondary power amplifier; and wherein if an amplitude of the eighth signal reaches a signal threshold, the secondary power amplifier is configured to be started to perform amplification processing on the eighth signal, wherein the signal threshold is a minimum signal amplitude required to start the secondary power amplifier, wherein the signal threshold corresponds to a conduction angle, and a value of the conduction angle of the secondary power amplifier is greater than 120°, wherein the amplitude of the eighth signal is configured to be adjusted by adjusting different phases of the fifth signal.