Patent ID: 9722556
Date: 2017-08-01
CPC Classifications: H01L,H03F

Claim:
1. A high frequency transformer for a differential amplifier, comprising: a first metal line that is integrated and formed in an IC chip through a CMOS process and that is connected to a differential signal line of a transistor included in the IC chip; and a second metal line that is formed in an MEMS chip through an MEMS process and that is inductively coupled with the first metal line in a state spaced apart from an upper portion of the first metal line, wherein the MEMS chip is stacked on an upper portion of the IC chip, wherein the second metal line is a primary part circuit of the high frequency transformer and receives a single-ended signal from an outside, and wherein the first metal line is a secondary part circuit of the high frequency transformer, is connected to an input-sided differential signal line of the transistor included in a driver stage of the driver stage and a power stage provided in the amplifier, and converts the single-ended signal applied to the primary part circuit into a differential signal.