| 摘要 |
A linear transconductance amplifier which is easily implemented with LSI and superior in a frequency characteristic. The linear transconductance amplifier includes N-channel MOS transistors M1, M2, M3 and M4 having their sources grounded, a current mirror circuit 1 for outputting a constant current 4Ib, and a current mirror circuit 2 in which the ratio between the input current and the output current is 2:1. Gates of the MOS transistors M1 and M3 are connected to each other to constitute an input terminal IN1. The constant current 4Ib is separated into two currents, one of which is the sum ISQ+ of the drain currents ID3 and ID4 of the MOS transistors M3 and M4 and the other of which is the 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 determine the differential output current I+.
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