Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2004-05-28
2009-06-30
Payne, David C (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C327S238000, C327S254000, C331S103000, C332S103000, C342S174000, C342S194000, C375S219000, C375S235000, C375S298000, C375S328000
Reexamination Certificate
active
07555051
ABSTRACT:
A quadrature transmitter and receiver have configurable I and Q channel paths that facilitate the application of selected test signals to determine gain and phase imbalances introduced by the transmitter and receiver. In a first ‘normal’ configuration, the I and Q channels are independently tested by applying an I-only test signal, followed by a Q-only test signal. In a second ‘switched transmitter’ configuration, the Q-only test signal is again applied. In a third ‘switched receiver’ configuration, the I-only test signal is again applied. By combining the results, gain and phase imbalances of the transmitter and the receiver can be determined. In a preferred embodiment, these configurations and test signals are applied within a single transceiver that has the output of its transmitter closed-loop coupled to the input of its receiver.
REFERENCES:
patent: 6298035 (2001-10-01), Heiskala
patent: 2002/0051497 (2002-05-01), Breems et al.
patent: 2003/0035470 (2003-02-01), Gu
Dsouza Adolf
NXP B.V.
Payne David C
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