On-chip multi-winding transformer

Abstract

The invention discloses an on-chip multi-winding transformer which is formed on an integrated circuit board. The on-chip multi-winding transformer comprises a multi-winding structure and a protection ring. The multi-winding structure at least comprises a first winding, a second winding and a third winding which are mutually discrete in space. The protection ring is formed on the periphery of the multi-winding structure. The first winding and the second winding serve as a first transformer body, and the second winding and the third winding serve as a second transformer body. According to the on-chip multi-winding transformer, more than three windings (more than two transformer bodies) can be integrated as a single element, so that the area is reduced, the multi-winding transformer is well matched, and the cost is further reduced.

Description

technical field

[0001] The present invention relates to an on-chip transformer, in particular to an on-chip multi-winding transformer with more than three windings. Background technique

[0002] In the application field of wireless communication, the three main units of the system are transmitter, antenna, and receiver. Generally speaking, the wireless signals transmitted in the air are all single-ended signals, but the differential circuit inside the transmitter is a differential signal, so the transmitter must integrate its internal The differential signal is converted into a single-ended signal before it can be sent to the air through the antenna; on the other hand, the receiver must convert the single-ended signal received by the antenna into a differential signal before it can be transmitted It is used by a low noise amplifier (LNA) inside it. This type of signal conversion operation is realized by a balanced-to-unbalanced (balun) transformer, and each of the transmit...

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