OPERATIONAL AMPLIFIER CIRCUIT
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专利名称：OPERATIONAL AMPLIFIER CIRCUIT
发明人：NORO MASAO,野 呂 正 夫
申请号：JP特願平6-85400
申请日：19940331
公开号：JP特開平7-273567A
公开日：
19951020
专利内容由知识产权出版社提供
专利附图：
摘要：PURPOSE:To simplify the configuration of a common mode feedback circuit in the differential input/differential output operational amplifier circuit. CONSTITUTION:An input signal is received from input terminals IN-A, IN-B and amplified by a differential amplifier stage 12. An output signal of the differential amplifier stage 12 is amplified by
an output amplifier stage 14 and output signals Voa, Vob are obtained from output terminals OUT-A, OUT-B. A common mode voltage component detection circuit 16 detects a common mode voltage component Vc of the output signals Voa, Vob. A common mode feedback circuit 18 amplifies a voltage difference between the common mode voltage component Vc and a reference voltage Vref by using TRs Q3, Q4 and a current corresponding to the voltage difference flows to the TR Q7. The current flows to TRs Q5, Q6 being components of a current mirror circuit and to the TR Q7 to control an output amplifier stage 14. Thus, the common mode voltage Vc of the differential output of the output amplifier stage 14 is fed back to make a common mode voltage Vc being a differential output stable.
申请人：YAMAHA CORP,ヤマハ株式会社
地址：静岡県浜松市中沢町10番1号
国籍：JP
代理人：加藤 邦彦
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