Power combining circuit based on on-chip transformer

Abstract

The invention discloses a power synthesis circuit based on an on-chip transformer, comprising: an on-chip transformer composed of a plurality of primary coils and a secondary coil; the secondary coil is composed of a plurality of annular turns surrounded by planar metal wires of the same layer , each primary coil is also composed of annular turns surrounded by corresponding plane metal wires of the same layer, and the number of annular turns of each primary coil is respectively smaller than the number of annular turns of the secondary coil; the annular turns of each primary coil The metal layer of the planar metal wire is higher or lower than the metal layer of the planar metal wire of the annular turn of the corresponding secondary coil; in the longitudinal direction, the planar metal wire of the annular turn of each primary coil and the annular turn of the corresponding secondary coil The planar metal wires are completely aligned, and the fully aligned structure increases the coupling area between the primary coil and the secondary coil. The invention can reduce the area of ​​the circuit, increase the coupling factor between the primary coil and the secondary coil, and improve the efficiency of the transformer.

Description

technical field [0001] The invention relates to a semiconductor integrated circuit, in particular to a power synthesis circuit based on an on-chip transformer. Background technique [0002] Such as figure 1 Shown is the circuit diagram of the power combining circuit of the on-chip transformer; figure 1 The on-chip transformer 101 in includes two primary coils and a secondary coil Ls, the two primary coils are marked with Lp101 and Lp102 respectively, the parameters of the primary coils Lp101 and Lp102 are the same and the turns ratio of the secondary coil Ls is 1 :2, so figure 1 The shown on-chip transformer 101 is a transformer of 2×1:2, that is, 2×1:2; the input sections of the primary coils Lp101 and Lp102 are respectively connected to the power input signal amplified by the power discharger (PA) 102, and the two power input The signal is power-combined through the on-chip transformer 101 to provide a power output signal, figure 1 The output terminal of the secondary ...

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Problems solved by technology

[0004] Depend on Figure 2A , the size of the area enclosed by coil 201 and coil 202 and 203 is not completely coincident, there is an area deviation of the enclosed area due to the lateral arrangement between the plane metal wires of the coil, the area enclosed by coil 201 and coil 202 and 203 The area where the areas do not overlap will bring a certain flux leakage, which will not only increase the area of ​​the circuit, but also reduce the coupling factor between the secondary coil Ls and the primary coils Lp101 and Lp102

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