Configurable system for cancellation of the mean value of a modulated signal

A technique of averaging, signal, applied in the direction of modulation, amplitude modulation, frequency demodulator arrangement, etc.

Active Publication Date: 2012-07-18
INFINEON TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Configurable system for cancellation of the mean value of a modulated signal
  • Configurable system for cancellation of the mean value of a modulated signal
  • Configurable system for cancellation of the mean value of a modulated signal

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Embodiment Construction

[0018] The claimed subject matter is now described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of claimed subject matter. It may be apparent, however, that claimed subject matter may be practiced without these specific details.

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

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Abstract

A configurable system for cancellation of the mean value of a modulated signal is disclosed. Some embodiments of the invention relate to a DC offset correction circuit comprising a feedback loop having a DAC controlled by a reconfigurable ADC, which determines (e.g., tracks) the mean value of a modulated input signal. The circuit operates according to two phase process. In a first "pre-modulation" tracking phase, an input signal is tracked by the ADC, which is configured to output the input signal's mean value as a digital code equivalent to the input mean value. The output of the ADC is provided to a DAC, which provides an analog representation of the mean value to an adder that subtracts the mean value from the modulated input signal to generate a bipolar adjusted input signal. In a second "modulation" phase, the estimated mean value is held constant, so that the bipolar adjusted input signal may be provided to an activated modulation circuit for improved system performance.

Description

technical field [0001] The present invention relates to circuits, and in particular to circuits related to modulation. Background technique [0002] References to related applications [0003] This application is related to US Patent Application Serial No. 12 / 956,324 (Attorney Reference INFAP266US), filed November 30, 2010. [0004] Modulation (ie, the generation of a modulated signal) allows data to be transmitted over a transmission medium such as radio waves by applying the data to a carrier wave by varying the amplitude, frequency, phase, or other characteristics of the carrier wave. Accordingly, modulated signals play an important role in wireless communications that are widely used today. To complete the communication process, the original information is extracted from the modulated carrier through a demodulation process. [0005] In various cases, the modulated signal may include a DC offset in addition to the modulated signal component. For example, a sensor con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03C1/62
CPCH03D1/06H03D3/003H03D2200/0052H03D1/04H03H7/00H03D2200/0047H03D2200/005H03K9/00H03C1/62H03H17/04
Inventor L·德雷尔A·方特L·桑特P·托尔塔
Owner INFINEON TECH AG
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