发明名称 |
Trans-conductance amplification circuit, trans-conductance filter circuit, and filtering method |
摘要 |
A trans-conductance filter circuit with an expanded cut-off frequency range is provided. The cut-off frequency of a trans-conductance filter circuit is changed by varying the current mirror ratio of a current mirror circuit. This mirror ratio is varied by changing the output current of a constant current source, or by switching among the respective action states of multiple transistors the actions of which are invoked within constant current regions. The variable cut-off frequency range can be expanded without losing the constant current attributes of the transistors.
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申请公布号 |
US6980054(B2) |
申请公布日期 |
2005.12.27 |
申请号 |
US20030379896 |
申请日期 |
2003.03.06 |
申请人 |
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发明人 |
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分类号 |
H03F3/45;H03H11/04;(IPC1-7):H03F3/45 |
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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