Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Reexamination Certificate
2005-08-19
2008-09-16
Jackson, Blane J (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
C455S180300, C455S260000
Reexamination Certificate
active
07426377
ABSTRACT:
A ΣΔ transmitter that permits setting of a loop filter LF, a charge pump current and other factors to the same conditions even if it is operated in a plurality of frequency bands, therefore allows the number of components to be reduced and at the same time enables the angle between the phases of local signals for reception use to be close to exactly 90°, which is a feature ensuring robustness against inter-element variations and accordingly suitable for large scale integration, is to be provided. The oscillation frequency of a VCO is set to an even-number multiple of the transmit frequency, and generates transmit signals via a divider. A device that varies the gain according to the amplitude component of modulating signals is added to an amplifier whose input is signals from the VCO, and the transmission of modulating signals involving amplitude modulation, such as EDGE, is thereby made possible.
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RF Micro Devices, “Polaris™ Total Radio Solution”, 2000.
Akamine Yukinori
Hori Kazuyuki
Kasahara Masumi
Kawabe Manabu
Tanaka Satoshi
Jackson Blane J
Miles & Stockbridge P.C.
Renesas Technology Corp.
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