Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Reexamination Certificate
2006-11-21
2006-11-21
Vo, Nguyen T. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
C455S307000, C455S311000, C455S312000
Reexamination Certificate
active
07139542
ABSTRACT:
A radio frequency receiver30, 32,includes a first component block12, 16, 18, 20;a second compensating component block22, 22a–22b, 34; and control circuitry 26 operable for controlling the state (e.g., load, bias, gain) of the first component block. When the control circuitry26causes a change in the state of the first component block that is expected to induce a DC offset in a signal, the control circuitry26changes the state of the second component block to compensate for an estimate of the DC offset. Preferably, the second component block is a filter22, 22a–22b, 34,that temporarily changes from a nominal cutoff frequency to an elevated cutoff frequency so that voltage will settle quickly and accurately at an estimated voltage, the estimated voltage being predetermined and based on the state change to the first component block. A method is also described for practicing the invention.
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U.S. Appl. No. 10/243,331 filed Sep. 13, 2002.
Gustafsson Mikael
Pärssinen Aarno
Seppinen Pauli
Vepsäläinen Jussi
Harrington & Smith,LLP
Nokia Corporation
Vo Nguyen T.
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