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1. 发明专利

JP2004096324A Amplifier circuit 审中-公开
公开(公告)号：JP2004096324A
公开(公告)日：2004-03-25
申请号：JP2002253400
申请日：2002-08-30
申请人： Nippon Precision Circuits Inc , 日本プレシジョン・サーキッツ株式会社
发明人： TEI HIROSUKE , YANO KAZUYA , KASAI HIROYUKI
IPC分类号： H03F3/34
摘要： PROBLEM TO BE SOLVED: To provide an amplifier circuit capable of highly accurately cancelling offset and able to be made small in size, low in power consumption, low in noise, and operated at a high speed.
SOLUTION: A capacitor C1 is connected to the output terminal of an operational amplifier OP 1. First and second switching elements SW1, SW2 electrically connect the input terminal of the operational amplifier OP 1 and the terminal of a capacitor C1 at a post-stage side to a reference potential level, thereby charging an offset voltage to the capacitor C1. Then the second switching element SW2 is turned off to permit the capacitor C1 to hold the voltage, and the first switching element SW1 is thrown to the position of a signal input terminal IN side to give the input signal to the operational amplifier OP1 and subtract the offset voltage for offset cancellation. Thus, the number of required elements is decreased, the deterioration in the accuracy due to dispersion in the element characteristics is suppressed, and downsizing, low power, low noise and high speed operations are promoted at the same time.
COPYRIGHT: (C)2004,JPO

2. 发明专利

JP2005150978A Apparatus of amplifying minute detection signal of sensor 审中-公开
标题翻译：放大检测信号传感器的设备
公开(公告)号：JP2005150978A
公开(公告)日：2005-06-09
申请号：JP2003383070
申请日：2003-11-12
申请人： Nippon Precision Circuits Inc , 日本プレシジョン・サーキッツ株式会社
发明人： TEI HIROSUKE , KASAI HIROYUKI , YANO KAZUYA
IPC分类号： G01D3/02 , G01J1/42 , G01J1/44 , H03F3/34
摘要： PROBLEM TO BE SOLVED: To provide an apparatus of amplifying a minute detection signal of a sensor which is capable of performing high-precision offset canceling and reducing noise in a low-frequency region.
SOLUTION: A first switching element 11 is provided for allowing the input terminal 2a of an operational amplifier 2 for inputting an output signal of a sensor 1 to selectively conduct with an output terminal 1a of the sensor 1 or with a reference potential 40. One terminal 31a of a capacitor 31 is connected to an output terminal 2c of the operational amplifier 2, and the other terminal 31b is connected to an output buffer 3. A second switching element 12 is provided for allowing the terminal 31b to selectively conduct with the reference potential 40, and the capacitor 31 is charged with an offset voltage in a state where each of switching elements 11, 12 is allowed to conduct with the reference potential 40. Subsequently, the element 12 is brought into a non-conduction status with the reference potential 40 and is held in this status. Then the element 11 is brought into a conduction status with the output terminal 1a of the sensor 1, the offset voltage is canceled, and the noise in a low-frequency region is reduced.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：解决的问题：提供一种放大能够执行高精度偏移消除并降低低频区域噪声的传感器的微小检测信号的装置。解决方案：提供第一开关元件11，用于允许用于输入传感器1的输出信号的运算放大器2的输入端子2a选择性地与传感器1的输出端子1a或参考电位40 电容器31的一个端子31a连接到运算放大器2的输出端子2c，另一个端子31b连接到输出缓冲器3.第二开关元件12用于允许端子31b选择性地与参考电位40和电容器31在允许开关元件11,12中的每一个与参考电位40导通的状态下被充电偏移电压。随后，元件12进入非导通状态参考电位40并保持在该状态。然后元件11与传感器1的输出端1a进入导通状态，偏移电压被消除，低频区域的噪声降低。版权所有（C）2005，JPO＆NCIPI

3. 发明专利

JP2006129107A Signal amplifier 审中-公开
标题翻译：信号放大器
公开(公告)号：JP2006129107A
公开(公告)日：2006-05-18
申请号：JP2004315069
申请日：2004-10-29
申请人： Nippon Precision Circuits Inc , 日本プレシジョン・サーキッツ株式会社
发明人： TEI HIROSUKE , KASAI HIROYUKI , YANO KAZUYA
IPC分类号： H03F1/26 , G01D3/028 , G01J1/42 , G01J1/44
摘要： PROBLEM TO BE SOLVED: To provide a very weak signal amplifier capable of performing highly accurate offset cancellation and reducing noise in a low frequency area. SOLUTION: This amplifier is provided with a first operational amplifier 100 for amplifying very weak signals of sensors 1a to 1n as an input signal from a positive phase input terminal 99, first switching elements SW1 and SW2 for switching an input from the positive phase input terminal 99 to either a very weak signal or reference potential, a second operational amplifier 101 in which a negative phase input terminal 112 is connected to an output terminal 111 of the first operational amplifier 100 through a resistor R3 and the output terminal is connected to the negative phase input terminal 112 through a resistor R4, a capacitor C1 in which the potential of one terminal 114 is determined in interlock with an output of the second operational amplifier 101 to obtain an output of a signal amplifier from the other terminal 115, and a second switching element SW3 provided between the terminal 115 of the capacitor C1 and the reference potential. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：提供能够执行高精度偏移消除并降低低频区域中的噪声的非常弱的信号放大器。解决方案：该放大器设有第一运算放大器100，用于放大传感器1a至1n的非常弱的信号作为来自正相输入端子99的输入信号，第一开关元件SW1和SW2用于从正的输入端切换输入相位输入端子99为非常弱的信号或参考电位，其中负相位输入端子112通过电阻器R3连接到第一运算放大器100的输出端子111并且输出端子被连接的第二运算放大器101 通过电阻器R4连接到负相输入端子112，其中一个端子114的电位与第二运算放大器101的输出互锁确定的电容器C1，以从另一端115获得信号放大器的输出，以及设置在电容器C1的端子115和基准电位之间的第二开关元件SW3。版权所有（C）2006，JPO＆NCIPI

4. 发明专利

JP2005150982A Apparatus of amplifying minute detection signal of multi-element sensor 审中-公开
标题翻译：多元传感器放大检测信号的设备
公开(公告)号：JP2005150982A
公开(公告)日：2005-06-09
申请号：JP2003383107
申请日：2003-11-12
申请人： Nippon Precision Circuits Inc , 日本プレシジョン・サーキッツ株式会社
发明人： TEI HIROSUKE , KASAI HIROYUKI , YANO KAZUYA
IPC分类号： G01D3/02 , G01J1/42 , G01J1/44 , H03F3/34
摘要： PROBLEM TO BE SOLVED: To provide an apparatus of amplifying a minute detection signal of a multi-element sensor, which is capable of performing high-accurate offset cancel and reducing noise in a low-frequency region, and varying an amplification rate of an operational amplifier.
SOLUTION: A first switching element 31 is provided which allows the positive phase input terminal 14 of an operational amplifier 12 for selectively inputting output signals of a plurality of sensor elements 1a-1n to selectively conduct with output terminals 2a-2n of the sensor elements 1a-1n or a reference potential 60. A reverse phase input terminal 15 is connected to the reference potential 60 via a resistor 41, and connected to an output terminal 16 via each of resistors 42, 43. One terminal 52 of a capacitor 51 is connected to the output terminal 16 of the operational amplifier 12, and the other terminal 53 is connected to an output buffer 13. A second switching element 32 is provided for allowing the terminal 53 to selectively conduct with the reference potential 60, switching elements 33, 34 are turned on/off to selectively short-circuit between each of the resistors 42, 43, thereby changing a resistance value to change the amplification rate of the operational amplifier 12.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供一种放大多元传感器的微小检测信号的装置，其能够执行高精度偏移消除并降低低频区域中的噪声，并且改变放大率的运算放大器。解决方案：提供了第一开关元件31，其允许运算放大器12的正相输入端子14有选择地输入多个传感器元件1a-1n的输出信号，以选择性地与输出端子2a-2n导通传感器元件1a-1n或参考电位60.反相输入端子15经由电阻器41连接到参考电位60，并且经由每个电阻器42,43连接到输出端子16.电容器的一个端子52 51连接到运算放大器12的输出端子16，另一个端子53连接到输出缓冲器13.第二开关元件32用于允许端子53选择性地与参考电位60导通，开关元件 33,34导通/截止以选择性地在每个电阻器42,43之间短路，由此改变电阻值以改变运算放大器12的放大率。 P>版权所有（C）2005，JPO＆NCIPI

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