Radio transmitter using Cartesian loop

Details Radio transmitter using Cartesian loop Radio transmitter using Cartesian loop

2008-08-07

2011-11-15

Trinh, Sonny (Department: 2618)

Telecommunications

Transmitter

With feedback of modulated output signal

C455S091000, C455S127100

Reexamination Certificate

active

08060038

ABSTRACT:
A radio transmitter including a combiner which combines input I/Q signals with feedback I/Q signals, a power amplifier which amplifies the quadrature modulated signal, a detector which detects amplitude and phase differences between the input and feedback I/Q signals, a switch to turn on and off the feedback I/Q signals, a generator to generate control signals which minimizes the amplitude difference and the phase difference, in a state where a transmission power is set, during for a period during which the switch is turned off, an amplitude adjuster which adjusts an amplitude of the feedback RF signal, during a period during which the switch is turned on, and a phase adjuster which adjusts a phase of the local signal, during the period during which the switch is turned on.

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