| 摘要 |
PROBLEM TO BE SOLVED: To vary gain of an amplifier without degrading noise characteristics. SOLUTION: Each unit 12 is constituted of gate grounding type MOS transistors M1, M2 which are cascode-connected to each other and a plurality of units 12 are connected in parallel to constitute a unit group. The number of units for executing an amplifying operation by supplying bias voltage V1 or ground voltage to the gate of the MOS transistor M2 in each unit 12 is changed to control the gain. COPYRIGHT: (C)2007,JPO&INPIT
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