Modulation method for improving signal conversion gain and high-gain modulator thereof

A high-gain modulator, comprising:

• a first modulation unit that modulates an input signal by using a first local oscillation signal, a second local oscillation signal, a third local oscillation signal, and a fourth local oscillation signal to generate a first modulation signal, wherein the first local oscillation signal, the second local oscillation signal, the third local oscillation signal, and the fourth local oscillation signal have different phases;
• a second modulation unit that modulates the input signal by using the first local oscillation signal, the second local oscillation signal, the third local oscillation signal, and the fourth local oscillation signal to generate a second modulation signal, wherein the first modulation signal and the second modulation signal have a phase difference;
• and
• an adder circuit that adds the first modulation signal and the second modulation signal to generate an output signal.

A modulation method, comprising:

• based on a duty cycle of a given signal, sampling an in-phase signal in a first timeslot and a second timeslot in each cycle of the given signal, to generate a first sampled signal;
• based on the duty cycle of the given signal, sampling a quadrature signal in a third timeslot and a fourth timeslot in each cycle of the given signal, to generate a second sampled signal;
• based on the duty cycle of the given signal, sampling the quadrature signal in the first timeslot and the second timeslot in each cycle of the given signal, to generate a third sampled signal;
• based on the duty cycle of the given signal, sampling the in-phase signal in the third timeslot and the fourth timeslot in each cycle of the given signal, to generate a fourth sampled signal, wherein a time difference exists between the first timeslot and the third timeslot, between the third timeslot and the second timeslot, and between the second timeslot and the fourth timeslot;
• and
• combining the first sampled signal, the second sampled signal, the third sampled signal, and the fourth sampled signal to form an output signal.