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Square wave signal component cancellation

A signal and component technology, applied in amplitude modulation components, baseband systems, digital transmission systems, etc.

Active Publication Date: 2015-01-28
INFINEON TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, a sensor configured to detect physical properties (such as proximity, acceleration, etc.) may include DC offsets due to environmental data sources

Method used

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  • Square wave signal component cancellation
  • Square wave signal component cancellation
  • Square wave signal component cancellation

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Embodiment Construction

[0018] The claimed subject matter will now be described with reference to the drawings, in which similar reference numerals are always used to refer to similar elements. In the following description, for the purpose of explanation, many specific details are set forth in order to provide a thorough understanding of the claimed subject matter. However, it may be obvious that the claimed subject matter can be implemented without these specific details.

[0019] It will be appreciated that, as described herein, the term "subtraction" is intended to include both the subtraction operation of two signals and the addition of one signal and a second signal having a reverse polarity. For example, the subtraction of two signals includes the operation of subtracting the first signal (for example, the DC offset correction signal) and the negative first signal (for example, the negative DC offset correction signal) from the second signal (for example, the input signal) And the addition of the...

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Abstract

Some embodiments of the invention a circuit configured to apply a time domain processing sequence to a modulated input signal to estimate a mean value of the modulated input signal and to subtract the estimated mean value from the modulated input signal, thereby removing the DC offset from the input signal. In one particular embodiment, the time domain processing sequence is based on integration and differentiation of a demodulated output signal. In such an embodiment, a circuit is configured to integrate a demodulated signal to generate an integrated signal having a triangular shaped output signal. The circuit then measures the slopes of the integrated signal, by differentiation of the triangular shaped integrated signal, and generates an appropriate DC offset correction signal based upon the measured slopes. The DC offset correction signal may be added on top of the actual input signal to cancel the unwanted DC offset component.

Description

Technical field [0001] The present invention relates to circuits, and particularly to circuits related to modulation. Background technique [0002] References to related applications [0003] This application is related to the U.S. patent application filed on November 30, 2010 with serial number 12 / 956,358 (attorney reference number INFAP267US). [0004] Modulation (ie, the generation of a modulated signal) allows data to be transmitted on a transmission medium such as radio waves by applying data to a carrier by changing the amplitude, frequency, phase, or other characteristics of the carrier. Therefore, the modulated signal plays an important role in the wireless communication widely used today. In order to complete the communication process, the original information is extracted from the modulated carrier through the demodulation process. [0005] In various situations, the modulated signal may include a DC offset in addition to the modulated signal component. For example, a sen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K7/00
CPCH04L25/063H03C2200/0079H03C1/06
Inventor A·方特L·桑特P·托尔塔
Owner INFINEON TECH AG