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AssigneeRenesas Electronics Corporation
InventorsHiroaki MATSUI, Yasuo Shima, Yasuyuki Kimura, Masahiko Yamamoto
Estimating the term…
An internal operation of RF IC is adjusted so that the level of an RF transmitter signal is substantially stopped from rising, or made to descend in course of ramp-up of the RF transmitter signal. This adjustment is enabled by ramp-up adjustment data Last 4 symbols contained in preamble data precedent to real transmission data transmitted after completion of ramp-up. The ramp-up adjustment data and real transmission data are supplied from a baseband LSI. The RF transmitter signal contains phase and amplitude modulation components according to the EDGE system. RF IC includes phase and amplitude modulation control loops PM LP and AM LP. Ramp-up of RF power amplifiers PA1 and PA2 is performed by controlling the gain of the first variable amplifier MVGA included in the AM LP according to ramp information. Thus, unwanted radiation's level is reduced during ramp-up of the RF transmitter signal of the RF power amplifiers.
A transmitter comprising:
An RF transmitter signal-processing circuit arranged so as to be connected with an RF power amplifier for producing an RF transmitter signal to be supplied to an antenna of a transmitter, the RF transmitter signal-processing circuit converting up a baseband transmitter signal thereby to produce an RF transmitter input signal to be supplied to the RF power amplifier,
A method for operating the transmitter comprising:
Dependencies are inferred from the claim text.