公开(公告)号：EP0460564A1

公开(公告)日：1991-12-11

申请号：EP91109013.2

申请日：1991-06-03

申请人： SUMITOMO ELECTRIC INDUSTRIES, LTD.

发明人： Hirakata, Noriyuki, c/o Yokohama Works Sumitomo

IPC分类号： H03F3/45

CPC分类号： H03F3/45968 ,  H03F3/45775 ,  H03F2200/81

摘要： A differential amplifier circuit suitable for amplifying a faint signal such as an output of various sensors. The differential amplifier (21) circuit includes switching units (12,13) which are provided at input and output side of a differential amplifier (11) to switch the polarities of an input signal and an output signal of the differential amplifier (11) so as to remove an Offset voltage. The differential amplifier circuit (21) always operates as an ideal amplifier.

摘要翻译： 各种传感器。 差分放大器（21）电路包括设置在差分放大器（11）的输入和输出侧的开关单元（12,13），用于将输入信号的极性和差分放大器（11）的输出信号切换为 以消除偏移电压。 差分放大器电路（21）总是作为理想放大器工作。

公开(公告)号：EP0410295A2

公开(公告)日：1991-01-30

申请号：EP90113802.4

申请日：1990-07-19

申请人： MOTOROLA, INC.

发明人： Mijuskovic, Dejan

IPC分类号： H03F3/393

CPC分类号： H03F1/303 ,  H03F3/45192 ,  H03F3/45775 ,  H03F2200/81

摘要： A single-ended operational amplifier uses a plurality of chopper circuits (9, 16, 24) to alternately transpose matched transistor pairs for cancelling offset errors due to transistor mismatches from statistical process variations. The differential input signals are transposed while simultaneously transposing the currents in a current mirror (14, 15) and in the load devices (37). The matched devices comprising an output stage (36) remain untransposed since their contribution to offset error is minimal but their contribution to noise error would be substantial due to the potentially larger voltage differentials existing between them.

摘要翻译： 单端运算放大器使用多个斩波电路（9,16,24）来交替地转置匹配的晶体管对，以消除由于来自统计过程变化的晶体管不匹配引起的偏移误差。 差分输入信号被同时转置在电流镜（14,15）和负载装置（37）中。 包括输出级（36）的匹配装置保持未被转换，因为它们对偏移误差的贡献最小，但由于它们之间存在潜在的较大的电压差，它们对噪声误差的贡献将是显着的。