Amplifier
专利汇可以提供Amplifier专利检索，专利查询，专利分析的服务。并且PURPOSE: To attain capacitive coupling, capable of preventing the function of a current source from being turned into a critical state by connecting a capacitance to a feedback resistor in series in a differential amplifier connecting the input side of a differential stage to an input terminal through the capacitance, connecting the output side to an output terminal and connecting the input terminal to the output terminal through the feedback resistor.
CONSTITUTION: A differential pair is formed by transistors(TRs) T
1 , T
2 , the emitters of the TRs T
1 , T
2 are mutually connected through a resistor R
12 , and the bases of the TRs T
1 , T
2 constitute input parts E
1 , E
2 . The resistor R
12 improves the linearity of the differential stage. Two TRs T
3 , T
4 are cascade-connected to the TRs T
1 , T
2 , the bases of the TRs T
1 , T
2 are mutually connected to supply reference potential V
ref1 and the collectors of the TRs T
3 , T
4 are connected to VP respectively through resistors R
3 , R
4 . The input parts E
1 , E
2 act as current sources and are connected to the output side of a stage, having the impedance of a resistor RS and parasitic capacitors C
10 , C'
10 . A current source IO is connected to the input parts E
1 , E
2 through capacitors C
1 , C'
1 , the values of the capacitors C
1 , C'
1 connected to negative feedback resistors through capacitors C
2 , C'
2 are selected, and the invalid component of the differential input impedance of the amplifier is suppressed so as not to exceed 15% of the impedance within the entire operational frequency range of the amplifier.
COPYRIGHT: (C)1991,JPO，下面是Amplifier专利的具体信息内容。
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