Transmitter and semiconductor integrated circuit for...

Details Transmitter and semiconductor integrated circuit for... Transmitter and semiconductor integrated circuit for...

2007-06-18

2008-10-07

Urban, Edward (Department: 2618)

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

C455S102000, C455S126000, C455S110000, C375S300000, C375S302000

Reexamination Certificate

active

07433653

ABSTRACT:
A transmitter adopting a polar loop system including a phase control loop for controlling the phase of a carrier signal outputted from a transmitting oscillator and an amplitude control loop for controlling the amplitude of a transmitting output signal outputted from a power amplification circuit, and designed to be capable of performing transmission using a GMSK modulation mode and transmission using an 8-PSK modulation mode. In the transmitter, the phase control loop is shared as a phase control loop for use in the GMSK modulation mode and a phase control loop for use in the 8-PSK modulation mode. A component similar to any one of components constituting a loop filter is provided in parallel therewith so that the component can be connected or disconnected in accordance with the modulation mode, for example, by use of a switching element.

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