Transmitter and radio communication terminal using the same

Details Transmitter and radio communication terminal using the same Transmitter and radio communication terminal using the same

2007-05-29

2007-05-29

Feild, Joseph (Department: 2681)

Telecommunications

Transmitter

Carrier frequency stabilization

C455S180100, C375S376000

Reexamination Certificate

active

10148960

ABSTRACT:
There are provided a transmitter and a wireless communication terminal apparatus using the same for solving a problem of undesired spurs due to harmonics of an output signal of a frequency synthesizer, and further solving a problem of the undesired spurs occurring when the harmonics of an output signal of a crystal oscillator are mixed into a VCO to facilitate to design a circuit or a mounting substrate. The transmitter has a relationship between an output frequency of a PLL frequency conversion circuit (5) and output frequencies of frequency synthesizers (1, 2) stored therein, and the output frequencies of the frequency synthesizers (1, 2) input into the PLL frequency conversion circuit (5) are controlled on the basis of the relationship so that the undesired spurs are suppressed. Thereby, even when the undesired spurs occur in the output of the transmitter due to a crosstalk between circuits or through a substrate, which can be easily suppressed, it is therefore possible to reduce time and cost for redesigning the circuit or the substrate.

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“RF Microelectronics”, Chapter 7.4.3, Behzad Razavi, (ISBNO-13-887571-5), Prentice Hall, Inc. Press.

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