Telecommunications – Receiver or analog modulated signal frequency converter
Reexamination Certificate
2008-08-18
2011-11-15
Nguyen, Simon (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
C455S214000, C455S226100, C455S263000, C455S333000, C455S336000
Reexamination Certificate
active
08060040
ABSTRACT:
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.
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Coats & Bennett PLLC
Nguyen Simon
Telefonaktiebolaget LM Ericsson (publ)
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