| 摘要 |
PURPOSE: A trimming circuit using Gm cells is provided which removes a DC offset component generated at the output of a low pass filter using a Gm-C structure by using Gm cells and capacitors. CONSTITUTION: A trimming circuit using Gm cells includes the first capacitor(C1) one side of which is connected to the first positive output that is output from a low pass filter, and the second capacitor(C2) one side of which is connected to the first negative output that is output from the low pass filter. The trimming circuit further has the first Gm cell(21) and the second Gm cell(22). The positive input port of the first Gm cell is connected to the first capacitor, and the negative input port of the first Gm cell is connected to the second capacitor. A negative output port of the first Gm cell is fed back to its positive input port, and its positive output port is fed back to its negative input port. The positive input port of the second Gm cell is connected to the negative output port of the first Gm cell, and the negative input port of the second Gm cell is connected to the positive output port of the first Gm cell, the negative output port of the second Gm cell is fed back to its positive input port, and its positive output port is fed back to its positive input port. |
