公开(公告)号：US20110199154A1

公开(公告)日：2011-08-18

申请号：US12704719

申请日：2010-02-12

Applicant: Chiang Pu ,  Ming-Chich Huang ,  Chan-Hong Chern ,  Tien-Chun Yang

Inventor： Chiang Pu ,  Ming-Chich Huang ,  Chan-Hong Chern ,  Tien-Chun Yang

IPC: G05F1/10

CPC classification number: G01C19/5776

Abstract: Some embodiments regard a circuit comprising: a high voltage transistor providing a resistance; an amplifier configured to receive a current and to convert the current to a first voltage that is used in a loop creating the current; and an automatic level control circuit that, based on an AC amplitude of the first voltage, adjusts a second voltage at a gate of the high voltage transistor and thereby adjusts the resistance and the first voltage; wherein the automatic level control circuit is configured to adjust the first voltage toward the first reference voltage if the first voltage differs from a first reference voltage.

Abstract translation: 一些实施例涉及一种电路，包括：提供电阻的高压晶体管; 放大器，被配置为接收电流并将电流转换成在产生电流的环路中使用的第一电压; 以及自动电平控制电路，其基于所述第一电压的交流振幅调整所述高电压晶体管的栅极处的第二电压，从而调整所述电阻和所述第一电压; 其中所述自动电平控制电路被配置为如果所述第一电压与第一参考电压不同，则将所述第一电压调整为朝向所述第一参考电压。