发明名称 |
True root-mean-square detection with a sub-threshold transistor bridge circuit |
摘要 |
A sub-threshold transistor bridge circuit for use in detecting the signal level of an input radio-frequency signal is disclosed. In an exemplary embodiment each branch of the sub-threshold transistor bridge circuit comprises a transistor configured to operate in the sub-threshold region over a predetermined range of input signal levels. An input radio-frequency signal applied to a first pair of opposing corners of the bridge circuit yields a bridge output signal at the remaining pair of opposing corners that has a low-frequency component substantially proportional to the squared-amplitude of the envelope of the input radio-frequency signal. Also disclosed are various detector circuits including a sub-threshold transistor bridge circuit, as well as methods for detecting a signal level for an radio-frequency signal using a sub-threshold transistor bridge. |
申请公布号 |
US8060040(B2) |
申请公布日期 |
2011.11.15 |
申请号 |
US20080193230 |
申请日期 |
2008.08.18 |
申请人 |
ARNBORG TORKEL;TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) |
发明人 |
ARNBORG TORKEL |
分类号 |
H04B1/16;H04B1/06;H04B1/08;H04B7/00;H04B17/00 |
主分类号 |
H04B1/16 |
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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