Adaptive high-order digital-to-analog conversion

A model and parameter technology, applied in the field of electronics, can solve the problems of complex analog circuits, increasing the complexity and cost of electronic devices, etc.

Inactive Publication Date: 2010-12-29
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Analog circuits can be relatively complex and can increase the complexity and cost of electronics using the DAC

Method used

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  • Adaptive high-order digital-to-analog conversion
  • Adaptive high-order digital-to-analog conversion
  • Adaptive high-order digital-to-analog conversion

Examples

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Embodiment Construction

[0022] Figure 1A A block diagram of an apparatus 100 that performs digital-to-analog conversion in a conventional manner is shown. Within device 100, digital circuitry 110 receives and processes digital data and provides a digital input signal d(n), where n is a sample index. DAC 120 converts the digital input signal from digital to analog using zero-order hold and provides an analog input signal where t is a continuous time variable. A reconstruction filter 130 filters the analog input signal and provides an analog output signal The filter 130 may perform various functions such as image attenuation caused by digital-to-analog conversion, compensation for frequency response degradation due to zero-order hold, and the like.

[0023] Figure 1B exhibit Figure 1A The digital input signal d(n) and the analog input signal in timing diagram. The digital input signal at discrete time n 1 , n 2 etc. contain numeric values. DAC 120 generates an analog input signal by outpu...

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PUM

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Abstract

Techniques for performing digital-to-analog conversion with first-order or higher-order hold using a simple analog circuit for signal reconstruction and employing feedback control techniques are described. In one design, a digital-to-analog conversion circuit includes an inverse model circuit, a feedback circuit, a zero-order hold (ZOH) circuit, and an analog circuit. The inverse model circuit processes a digital input signal and provides a first digital signal. The feedback circuit receives the first digital signal and an analog output signal from the analog circuit, performs low frequency noise filtering, and provides a second digital signal. The ZOH circuit converts the second digital signal from digital to analog with zero-order hold and provides an analog input signal for the analog circuit. The analog circuit operates on the analog input signal and provides the analog output signal. The analog circuit may be a simple circuit having one or more poles.

Description

technical field [0001] The present invention relates generally to electronics and, more particularly, to techniques for performing digital-to-analog conversion. Background technique [0002] A digital-to-analog converter (DAC) is a circuit that receives digital signals and outputs analog signals. DACs are commonly used in various electronic devices to provide an interface between digital and analog circuits. For example, a wireless communication device such as a cellular telephone may include one or more DACs to interface with transmitters, audio output circuits, video output circuits, and the like. [0003] DACs are typically used in conjunction with analog circuitry such as reconstruction filters to filter the analog signal from the DAC. Analog circuitry can be relatively complex and can add to the complexity and cost of the electronics in which the DAC is used. Simple analog circuits are required to perform the digital-to-analog conversion in order to reduce complexity...

Claims

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Application Information

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IPC IPC(8): H03M3/04
CPCH03M3/50
Inventor 加里·约翰·巴兰坦
Owner QUALCOMM INC
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