Power control method based on 1 bit time modulation technique

Aiming at the problems of complex structure and multi-channel control signals of traditional digital attenuator, a power control method based on 1 bit time modulation technique is proposed in this paper. By controlling the duty ratio of 0° and 180° of the 1 bit phase shifter, the power of the fundamental component of the input signal can be modulated dynamically, and it can be used as a digital attenuator after using a bandpass filter to suppress excess harmonic components. Furthermore, the constraints of time precision on different attenuation and modulation frequency are discussed. The effectiveness of the proposed power control method is verified by simulation and experimental results. Compared with the cascade network and multi-channel control signals of the traditional digital attenuator, only one modulation module and two-channel control signals are needed in the proposed method to realize various attenuation states dynamically, so it has the advantage of simpler structure.