Invention Grant
US09143108B2 Variable gain amplifier, current detecting circuit using the same, motor driving circuit and electronic apparatus
有权
可变增益放大器，使用其的电流检测电路，电机驱动电路和电子设备
- Patent Title: Variable gain amplifier, current detecting circuit using the same, motor driving circuit and electronic apparatus
- Patent Title (中): 可变增益放大器，使用其的电流检测电路，电机驱动电路和电子设备
-
Application No.: US13896441Application Date: 2013-05-17
-
Publication No.: US09143108B2Publication Date: 2015-09-22
- Inventor: Hisashi Sugie
- Applicant: Rohm Co., Ltd.
- Applicant Address: JP Kyoto
- Assignee: Rohm Co., Ltd.
- Current Assignee: Rohm Co., Ltd.
- Current Assignee Address: JP Kyoto
- Agency: Fish & Richardson P.C.
- Priority: JP2012-114731 20120518
- Main IPC: H03F3/00
- IPC: H03F3/00 ; H03G3/30 ; H03G1/00
Abstract:
A variable gain amplifier includes: a first input terminal, a second input terminal and an output terminal; an operational amplifier; a first resistor interposed between the first input terminal and an inverted input terminal of the operational amplifier; second and third resistors interposed between the inverted input terminal and the output terminal; and a fourth variable resistor having a first terminal connected to a node between the second resistor and the third resistor and a second terminal connected to the non-inverted input terminal, wherein the fourth variable resistor includes a resistance pass including a resistor and a switch.
Public/Granted literature
Information query
