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Filtering circuit and method

A filter circuit and resistor technology, applied in the field of filtering, can solve the problems of increasing the difficulty of adjusting the PVT curve, and achieve the effect of flexible adjustment, reducing the difficulty of adjustment, and meeting PVT requirements.

Pending Publication Date: 2017-12-01
GUANGZHOU HUIZHI MICROELECTRONICS
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, a fixed resistor and a fixed capacitor are used to form a low-pass filter, so the shape of the control voltage Vramp signal can only be adjusted by adjusting the value of a digital-to-analog converter (DAC, Digital to Analog Converter), so that the PVT The difficulty of adjusting the curve increases

Method used

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  • Filtering circuit and method
  • Filtering circuit and method

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Embodiment Construction

[0042] The filter circuit provided by the embodiment of the present invention is mainly used in GSM PA. A shaping branch is set after the filtering branch. As a part of the filtering circuit, the filtered control voltage Vramp signal is shaped by the shaping branch to adjust and control The waveform shape of the voltage Vramp signal can adjust the rising waveform and falling waveform of the control voltage Vramp signal asymmetrically, so that the shape of the control voltage Vramp signal can be flexibly adjusted, and the adjustment difficulty of the PVT curve can be reduced.

[0043] The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0044] figure 1 It is a structural...

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Abstract

The invention discloses a filtering circuit, comprising: a filtering branch and a shaping branch connected to the filtering branch. The filtering branch is configured to filter an inputted level signal to obtain a filtered level signal; and the shaping branch is configured to shape the filtered level signal during a changing process of the inputted level signal from a first level to a second level to obtain an outputted level signal. The rising waveform and the falling waveform of the outputted level signal are asymmetrical. The invention also discloses a filtering method.

Description

technical field [0001] The present invention relates to the technical field of filtering, in particular to a filtering circuit and method. Background technique [0002] Generally, in a Global System for Mobile Communication (GSM, Global System for Mobile Communication) power amplifier (PA, Power Amplifier), the shape of the power versus time (PVT, Power Verus Time) curve will affect the spectrum index, that is, if the PVT If the curve is not well adjusted, it will seriously affect the RF indicators such as phase error, switching spectrum and modulation spectrum. For example, if the PVT curve exceeds the standard, it will not be able to make a normal call. It can be seen that the modulation of PVT curve is very important for GSM PA. [0003] Generally, the control voltage Vramp signal is one of the factors affecting the shape of the PVT curve. Therefore, the output power can be adjusted by adjusting the control voltage Vramp signal to achieve different output power levels. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H5/12H03K5/12H03K17/28
CPCH03H5/12H03K5/12H03K17/28
Inventor 彭振飞苏强王鑫奕江涛李平
Owner GUANGZHOU HUIZHI MICROELECTRONICS
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