Broadband high-balance on-chip transformer Balun

The invention relates to a broadband high-balance on-chip transformer Balun, and belongs to the field of radio frequency devices. The broadband high-balance on-chip transformer Balun comprises two primary coils and a secondary coil. The two primary coils are formed in the manner that inductors with center taps are broken near the center taps, and the secondary coil is a plane spiral inductor with a center tap. The primary coils and the secondary coil are embedded to improve the coupling coefficient. The center taps of the primary coils and the center tap of the secondary coil are connected together and finally connected to the ground plane. According to the scheme design, the transformer Balun can solve the problems that when an existing transformer Balun works at the low frequency, the working band is narrow, the phase balance degree is poor, and insertion losses and return losses are large. The broadband high-balance on-chip transformer Balun can be used on an occasion where single end-difference conversion needs to be finished in the design of an on-chip integrated circuit.