发明名称 |
Active filter circuit of a capacity ground type |
摘要 |
An active filter circuit has differential transistors having first conductivity type bipolar transistors and load transistors having second conductivity type bipolar transistors. A connecting node between the differential transistors and the load transistors is driven by a middle electric potential. Voltage dependent characteristics of earth capacitance including parasitic capacitances parasitic to the differential transistors and the load transistors can be kept constant by offsetting the voltage dependent characteristics of the parasitic capacitances. It is thereby possible to make the active filter circuit small in size and the consumed electric power reduced.
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申请公布号 |
US5475338(A) |
申请公布日期 |
1995.12.12 |
申请号 |
US19920858647 |
申请日期 |
1992.03.27 |
申请人 |
SONY CORPORATION |
发明人 |
YAMAGUCHI, FUTAO |
分类号 |
H03F3/45;H03H11/04;H03H11/12;(IPC1-7):H03K5/00;G06G7/12 |
主分类号 |
H03F3/45 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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