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Two point phase modulator and method for controlling pressure-control oscillator gain in modulator

A technology of voltage-controlled oscillator and phase modulator, applied in pulse position modulation, modulation, angle modulation and other directions, can solve problems such as deficiencies

Inactive Publication Date: 2010-01-06
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] While the above designs have advantages, they may be lacking for some systems that have strict requirements on VCO gain estimation, such as EDGE and WCDMA systems

Method used

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  • Two point phase modulator and method for controlling pressure-control oscillator gain in modulator
  • Two point phase modulator and method for controlling pressure-control oscillator gain in modulator
  • Two point phase modulator and method for controlling pressure-control oscillator gain in modulator

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Embodiment Construction

[0048] The following is a detailed description of embodiments of the present invention with reference to the accompanying drawings, in which like element numerals and designations are used throughout.

[0049] As mentioned earlier, with the modulation schemes described above, some systems, such as EDGE and WCDMA, and future systems with more complex modulation schemes (eg 16QAM) require more stringent VCO gain estimation. Accordingly, the present invention is directed to methods and systems for automatic calibration of VCO gain. In addition, the use of automatic calibration may result in higher throughput and more stable work in manufacturing.

[0050] Refer again image 3 The improved VCO, the compensation for VCO gain variation can be changed by changing the modulation input varactor C v1 on the DC level to apply. K' is estimated by applying the VCO gain after the digital-to-analog converter (DAC) (not explicitly shown) VCO , the dynamic range requirement of the DAC is n...

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PUM

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Abstract

Method and system are disclosed for automated calibration of the VCO gain in phase modulators. The method and system of the invention comprises synthesizing, in a phase modulator, a signal having a given output frequency using a controlled oscillator having a frequency control input, a modulation input, and a feedback loop. A frequency control signal is applied to the frequency control input, and gain variation of the controlled oscillator is compensated for outside of the feedback loop via the modulation input. The method and system of the invention may be employed in any telecommunication system that uses phase and amplitude modulation, including EDGE and WCDMA systems.

Description

technical field [0001] The present invention relates to direct modulation of radio frequency signals, in particular to direct modulation of radio frequency signals using a two-point phase modulator. Background technique [0002] All spectrally efficient digital narrowband radio transmitters require in principle two operations: (1) the baseband data must be filtered to limit its spectral width, and (2) the resulting baseband signal must be converted to the intended RF band. There are many techniques for converting baseband signals to radio frequency signals. One technique involves feeding the baseband signal directly into the input of a frequency synthesizer, such as a PLL (Phase Locked Loop). Examples of this technique can be found in US Patents 6229400, 5483203 and 5207491; European Published Applications 1079514 and 0961412; and UK Published Application 2337884. [0003] The operation of the PLL is well known to those skilled in the art, so it will not be described here....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03C3/09H03C3/00H03K7/04H03L7/089H03L7/093H03L7/099H03L7/18H03L7/197H04L27/20
CPCH03C3/0991H03C3/0925H03C3/0933H03L7/0893H03C3/09H03L7/18H04L27/20
Inventor M·尼尔松
Owner TELEFON AB LM ERICSSON (PUBL)