Telecommunications – Receiver or analog modulated signal frequency converter – Measuring or testing of receiver
Reexamination Certificate
2006-02-07
2008-11-11
Vo, Nguyen (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Measuring or testing of receiver
C455S296000, C455S324000
Reexamination Certificate
active
07450919
ABSTRACT:
A system and method are provided for compensating for an I/Q mismatch of a receiver in a mobile terminal. In general, the receiver and a transmitter of the mobile terminal are formed on a single substrate. A transmit signal is transmitted via the transmitter. Due to leakage through the substrate, the transmit signal is provided to one or more points in the receiver. One of these points is an input of the amplifier circuitry. A gain of the amplifier circuitry is modulated during reception of the transmit signal such that an amplified signal provided by the amplifier circuitry is offset from the carrier frequency of the transmit signal by a known frequency offset. The amplified signal is downconverted to provide a quadrature output signal. Processing circuitry processes frequency components of the quadrature output signal corresponding to the known frequency offset to determine the I/Q mismatch of the receiver.
REFERENCES:
patent: 7123896 (2006-10-01), Chiu
patent: 7346313 (2008-03-01), Cafarella
patent: 2007/0123188 (2007-05-01), Mo et al.
Chen Jesse E.
Zhang Pengfei
RF Micro Devices, Inc.
Vo Nguyen
Withrow & Terranova, P.L.L.C.
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