发明名称 |
Adjusting the trans-conductance of a filter |
摘要 |
An analog or continuous tuning loop which generates an analog signal representative of a difference of signals generated by a mirror trans-conductor circuit (having electrical characteristics similar to other such trans-conductor circuits used in a filter) and a reference circuit. The analog signal is used to adjust the trans-conductance such that the current generated by the trans-conductance circuit equals a reference current generated by the reference circuit. A filter using such trans-conductor circuits may be designed to be tuned to a desired cut-off frequency when the desired trans-conductance is achieved. An additional digital circuit generates a few digital bits, which may be used to selectively activate the respective trans-conductor elements contained in the mirror trans-conductor circuit and the filter.
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申请公布号 |
US6657483(B1) |
申请公布日期 |
2003.12.02 |
申请号 |
US20020302998 |
申请日期 |
2002.11.25 |
申请人 |
TEXAS INSTRUMENTS INCORPORATED |
发明人 |
SAHU DEBAPRIYA |
分类号 |
H03H11/04;H03H11/12;(IPC1-7):H03K5/00 |
主分类号 |
H03H11/04 |
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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