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Modulator having controllable transmission bandwidth and related method for controlling transmission bandwidth

A modulator and bandwidth technology, applied in the field of phase-locked loop, can solve the problem of increasing the power consumption of the two-point modulator

Inactive Publication Date: 2010-02-24
INTEL MOBILE COMM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] image 3 The two-point modulator described in has the disadvantage that the additional circuit block increases the power consumption of the two-point modulator compared to a conventional single-point modulator
in addition, image 3 The illustrated principle has the same figure 2 Similar disadvantages of the explained principle, that is, the matching between the digital modulation channel and the analog modulation channel is critical for image 3 The correct operation of the modulator as described in the

Method used

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  • Modulator having controllable transmission bandwidth and related method for controlling transmission bandwidth
  • Modulator having controllable transmission bandwidth and related method for controlling transmission bandwidth
  • Modulator having controllable transmission bandwidth and related method for controlling transmission bandwidth

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Embodiment Construction

[0049] for prior art Figures 1 to 3 , you can refer to the statement above in the introduction of the specification.

[0050] known in the art and shown in the figure 1 The sigma-delta fractional-N modulator in is expressed as Figure 4 The starting point for the first exemplary embodiment of a modulator according to the invention shown in . involves figure 1 The description of the circuit shown in the Figure 4 The modulator according to the present invention shown in . exist figure 1 and Figure 4 Circuit components and signals having the same reference numerals correspond to each other. and figure 1 Compared to the block diagram shown in the phase frequency detector 1a and charge pump 1b in Figure 4 are illustrated separately in the block diagram.

[0051] figure 1 The modulator shown in and Figure 4 The difference between the first exemplary embodiment of the modulator according to the invention shown in , is that the modulator according to the invention has...

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Abstract

The modulator according to the invention is based on the modulation of a PLL, with the bandwidth of the PLL being variable. The modulator also has a means ( 14, 15 ) for determination of a signal (phir(kTs); FDEV) which is characteristic of the modulation shift of the modulated signal. Furthermore, the modulator contains a comparison means ( 16 ) for comparison of this signalwith a signal (phi(kTs+tau); FDEVNOM) which is characteristic of the nominal modulation shift, as well as a means ( 18 ) for variation of the bandwidth as a function of the output signal from the comparison means ( 16 ).

Description

technical field [0001] The invention relates to a modulator for a transmitter of a digital communication system, the modulator being based on a phase locked loop (PLL) capable of being modulated. The invention also relates to a method for regulation of a modulator such as this. Background technique [0002] Modern modulators for phase or frequency modulation and used in transmitters of digital communication systems are often based on the direct modulation principle of a frequency synthesizer, which in turn takes the form of a PLL. [0003] figure 1 A typical scheme for a modulator such as this is shown in T.A. Riley et al., "A simplified continuous phase modulator technique", May 1994, IEEE Transactions on Circuits and Systems II: Analog and Digital It is described in Signal Processing, Vol.41, No.4, pages 321-328. The essence of the modulator is a PLL acting as a frequency synthesizer with a closed control loop consisting of a phase-frequency detector 1 with a charge pum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00
CPCH04L27/2017H04L27/12
Inventor G·利普马
Owner INTEL MOBILE COMM GMBH