US 12,081,176 B2
Gain-controllable magnetoresistive analog amplifier
Zhimin Zhou, Zhangjiagang (CN); and James Geza Deak, Zhangjiagang (CN)
Assigned to MultiDimension Technology Co., Ltd., Zhangjiagang (CN)
Appl. No. 17/904,515
Filed by MultiDimension Technology Co., Ltd., Zhangjiagang (CN)
PCT Filed Feb. 9, 2021, PCT No. PCT/CN2021/076124
§ 371(c)(1), (2) Date Aug. 18, 2022,
PCT Pub. No. WO2021/164269, PCT Pub. Date Aug. 26, 2021.
Claims priority of application No. 202010098935.3 (CN), filed on Feb. 18, 2020.
Prior Publication US 2023/0084058 A1, Mar. 16, 2023
Int. Cl. H03F 1/34 (2006.01); G01R 33/00 (2006.01); G01R 33/09 (2006.01)
CPC H03F 1/34 (2013.01) [G01R 33/0094 (2013.01); G01R 33/091 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A gain-controllable magnetoresistive analog amplifier, comprising:
a substrate located in an X-Y plane;
an output signal magnetoresistive sensor located on the substrate; and
an input signal coil and a gain adjustment coil, the input signal coil and the gain adjustment coil located on two side surfaces of the output signal magnetoresistive sensor, respectively,
wherein,
the gain adjustment coil is used to input a gain signal by the generation of a gain magnetic field, in order to set the gain magnetic field is applied along a magnetization direction of a free layer of the output signal magnetoresistive sensor, thereby adjusting the slope of the input resistance-magnetic field transfer curve of the output signal magnetoresistive sensor, and
the input signal coil is used for inputting a current signal to generate an input magnetic field, in order to apply the input magnetic field to a magnetization direction of a pinned layer of the output signal magnetoresistive sensor, thereby controlling the gain signal to adjust a gain factor of an output signal after the current signal passes through the output signal magnetoresistive sensor, and the current signal is alternate current signal or direct current signal.