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Radio equipment including frequency synthesizer

A technology of radio equipment and synthesizer, which is applied in the direction of radio/inductive link selection arrangement, automatic power control, electrical components, etc., and can solve problems such as phase noise and difficulty in application

Inactive Publication Date: 2004-02-18
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, the presence of a phase-locked loop cancels out this modulation, so this modulation is difficult to apply
In addition, the problem of phase noise is encountered, which is caused by the digital frequency divider conventionally included in the synthesizer operating at high frequencies, such as the 800MHz band

Method used

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  • Radio equipment including frequency synthesizer
  • Radio equipment including frequency synthesizer
  • Radio equipment including frequency synthesizer

Examples

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Embodiment Construction

[0015] Figure 1 shows a radio device according to the invention. The equipment is, for example, a transceiver of the type provided with a portable radiotelephone. It consists of a transmitting circuit 1 and a receiving circuit 2 which are coupled to an antenna 5 via a duplexer 8 . The transmission circuit 1 is constituted by an input terminal 11 for receiving a modulated signal. This modulated signal phase modulates and / or frequency modulates the carrier generated by the frequency synthesizer 12 . This synthesizer uses the frequency signal FR generated by the reference frequency generator 15 in order to generate a signal of the frequency FS defined by the frequency control 16 . The output signal of the combiner 12 is amplified by an amplifier 18 before being applied to the antenna 5 . The receiving circuit 2 is formed by a receiving system 20 for supplying data to an output 27 .

[0016] Figure 2 shows the structure of a synthesizer 12 implemented in accordance with the pr...

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PUM

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Abstract

This device includes a frequency synthesizer (12) comprising two phase-locked loops (L1 and L2). The one comprises a low-pass filter (68) and the other a high-pass filter (49). The loop with the low-pass filter fixes the basic frequency of the synthesizer and the other corrects the phase noise. With this arrangement it is easy to apply a modulation frequency to the terminal (11) that is not disturbed by said loops if this modulation frequency is found to be higher than the cut-off frequency of the low-pass filter.

Description

technical field [0001] The present invention relates to radio equipment comprising a frequency synthesizer for generating a synthesized frequency signal, the synthesizer comprising phase and / or frequency modulation controls, for receiving a signal representing a bandwidth called the modulation bandwidth, and the synthesizer being composed of At least two phase-locked loops are formed. [0002] The invention also relates to a method of modulating the phase and / or frequency of a frequency synthesizer. Background technique [0003] Such devices are well known and widely used, especially in the field of portable telephone devices using a large number of frequency channels determined by a synthesizer. It was concluded that a synthesizer essentially consists of a voltage-controlled variable oscillator, using a phase-locked loop, hopefully slaved to frequency from a reference oscillator. Equipped with a crossover for finalizing the output frequency of the synthesizer. [0004] O...

Claims

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Application Information

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IPC IPC(8): H03C3/00H03C1/00H03C3/09H03L7/087H03L7/093H03L7/22H04B1/04
CPCH03C3/095H03C3/0983H03C1/00
Inventor J·A·查巴斯
Owner NXP BV