Feedback type pre-amplifier

申请公布号：US5844445(A)

申请号：US19960736209

申请日期：1996.10.25

申请公布日期：1998.12.01

申请人：

HITACHI, LTD.

发明人：TAKEYARI, RYOJI

分类号：H03G3/10;H03F1/34;H03F3/08;H03F3/343;H03F3/45;H03G1/00;H04B1/18;(IPC1-7):H03F1/32;H03F17/00

主分类号：H03G3/10

摘要：A pre-amplifier disclosed in which low noise at the time of small input and linear amplification at the time of large input are compatible. In a pre-amplifier, such compatibility can be realized by constituting a current mirror circuit, with respect to a current of a first stage transistor in a transimpedance portion, by a by-passing transistor which is provided at an input side of the pre-amplifier. In such a configuration, by making a by-pass current flow proportionally to an input instantaneous current at the time of a large input, the transimpedance can be made small equivalently to thereby widen the dynamic range.

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