Transmitting stage

Abstract

A transmission stage in polar loop technology includes an amplitude adjustment device (16), a phase adjustment device (17), a VCO (14) and a feedback path (19). A variable amplifier (19b) is provided in the feedback path, and the amplitude adjusting means (16) is further implemented to be controlled by the control means (22) to change the power amplifier accordingly according to the power variation requirement of the output signal of the amplifier (13) Amplitude control signal. Simultaneously, the control means (22) are implemented to correspondingly control the variable feedback path amplifier such that the amplitude of the output signal of the variable feedback path amplifier is maintained within a narrow limited predetermined range. Then, the power variation of the output signal of the amplifier operating in the non-linear region is kept away from the phase locked loop, so that the phase adjustment device can be implemented at low cost and operate reliably in any way.

Description

Technical field [0001] The present invention relates to a transmission stage and, in particular, to a transmission stage including an amplitude locked loop and a phase locked loop to amplify amplitude and phase modulated signals via a nonlinear power amplifier and, if appropriate, to transmit the signal via a wireless transmission channel. Background technique [0002] For mobile communication services, only a limited number of frequency bands exist. The required channel bandwidth and possible data rate for data transmission are decisive factors that characterize the effectiveness of the transmission system. Therefore, within this bandwidth, the goal is to obtain the maximum data rate, and there are different methods for allowing higher data rates in the same channel bandwidth and thereby making more efficient information flow possible. [0003] In recent years, in the field of mobile communications, the GSM (Global System for Mobile Communications) standard has become establishe...

AI Technical Summary

Problems solved by technology

[0023] It has been found that having a signal with too high dynamics in the feedback path results in the fact that the rectifier detector which determines the actual signal amplitude has to be implemented very expensively, and even more seriously the limiter required to generate the actual signal phase must also be very expensively implemented, Because, when the input signal becomes very small in it, it needs a very high amplification to reach the amplitude limitation to provide the actual signal phase, however, this must be ensured in any case, because once the limiter which produces the actual signal phase is not Provided any defined output signal, the phase-locked loop of the polarity loop is phase-locked, which causes a complete loss of data transmission, in other words, the failure of the phase-locked loop of the polarity loop causes the information connection to be interrupted immediately and The fact that a new synchronization must be waited for is cumbersome and intolerable since it can be easily seen

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