Title：Method for imbalance correction by controlling amplitude of pre-amplifier

Country：China

Patent No.：201210569383.5

Legal Status：Authorized

Inventor：Hui Jiang, Ziqiang Wang, Chun Zhang, Hanjun Jiang, Hong Chen, Zhihua Wang

Assignee：Graduate School at Shenzhen, Tsinghua University

Address：Tsinghua Campus, Xili University Town, Nanshan District, Shenzhen City 518055, Guangdong Province

Filing Date：2012-12-25

Issue Date：2015-09-02

The invention discloses an imbalance correcting method for a pre-amplifier through controlling amplitude. The pre-amplifier comprises a first positive metal oxide semiconductor (PMOS) transistor, a second PMOS transistor, a third negative metal oxide semiconductor (NMOS) transistor, a fourth NMOS transistor and a fifth NMOS transistor. An on resistor of a load tube is adjusted through adjusting and controlling the amplitude of control signals on grids of the first PMOS transistor MP1 and the second PMOS transistor MP2 of the load tube, so that when imbalance occurs in a circuit and current at the left side and the right side is unequal, pressure drop from a power source to output nodes at the left side and the right side is equal, and therefore forward output voltage Voutp is equal to reverse output voltage Voutn and the imbalance is corrected. According to the imbalance correcting method for the pre-amplifier through controlling the amplitude, additional arrangement of a controllable capacitor or a metal oxide semiconductor (MOS) tube in a pre-amplifier circuit is not needed and therefore load effect on voltage of an input end can not be exerted.

Patent Certificate： PDF/Jpg