| 摘要 |
PROBLEM TO BE SOLVED: To easily compose a linear transconductance amplifier of an LSI and to improve frequency characteristics. SOLUTION: This linear transconductance amplifier is provided with n-channel MOS transistors M1, M2, M3 and M4 with their sources grounded, a current mirror circuit 1 for outputting a fixed current 4Ib and a current mirror circuit 2 with the input current to output current ratio of 2:1. The gates of the MOS transistors M1 and M3 are commonly connected to form an input terminal IN1. The fixed current 4Ib is branched to the sum ISQ+ of the drain currents ID3 and ID4 of the respective MOS transistors M3 and M4 and an input current ISQ- of the current mirror circuit 2. The sum of the drain current ID1 of the MOS transistor M1 and the output current ISQ-/2 of the current mirror circuit 2 forms a differential output current I+.
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