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Data weighted average construction and method, signal converting method and signal wire winding method

A weighted average and digital signal technology, applied in the field of DWA structure and digital/analog signal conversion, can solve problems such as poor utilization rate, poor performance, and large circuit area

Inactive Publication Date: 2008-12-31
FARADAY TECH CORP
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  • Description
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Problems solved by technology

For example, the existing DWA structure may produce in-band tone (in-band tone), so the performance of spur-free dynamic range (SFDR) may be poor
In addition, for high DAC resolution, its efficiency is poor, and its circuit area is also large

Method used

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  • Data weighted average construction and method, signal converting method and signal wire winding method
  • Data weighted average construction and method, signal converting method and signal wire winding method
  • Data weighted average construction and method, signal converting method and signal wire winding method

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Embodiment Construction

[0027] In an embodiment of the present invention, a new DWA structure is proposed, which uses a DWA algorithm to generate an output signal. The DWA output signal is wound into two sets of control signals that operate independently (also called independent rotation) through signal winding. These two sets of control signals are used to control the on / off of internal capacitors such as switched capacitor filters (SCF). In long-term operation, the error caused by the capacitance mismatch between the internal capacitors of the switched capacitor filter can be slowed down, so as to increase the correctness of the circuit operation.

[0028] Please refer to FIG. 1 , which shows a circuit diagram of a DWA structure according to an embodiment of the present invention. This embodiment can be applied to a Sigma-Delta Modulator (Sigma-Delta Modulator, SDM). As shown in Figure 1, the DWA structure 10 includes: a delay unit 12, an adder 13, a binary-thermal signal converter (Binary to The...

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Abstract

The invention relates to a data weighted average (DWA) structure which comprises a first delay unit for delaying an input digital signal; a binary-thermal signal converter for converting an output signal of the first delay unit into a thermal signal; an adder; a second delay unit for delaying an output signal of the adder (the output signal of the second delay unit is fed back to the adder which adds the input digital signal with the output signal of the second delay unit); a decoder for decoding the output signal of the second delay unit; a barrel shifter for generating an output signal according to the thermal signal under the control of the output signal of the decoder; and a plurality of signal wires for winding the output signals of the barrel shifter to be two groups of independent control signals.

Description

technical field [0001] The invention relates to a data weighted average (DWA) structure and a digital / analog signal conversion method, and in particular to a DWA structure and a digital / analog signal conversion method capable of reducing component mismatch errors. Background technique [0002] Digital-to-analog converters (DACs) or analog-to-digital converters (ADCs) have been widely used in communication systems, consumer electronics, audio equipment, and the like. However, inside a DAC or ADC, nonlinear problems caused by component mismatch are unavoidable. Such issues are particularly important for Sigma-Delta modulators (Sigma-DeltaModulator, SDM). [0003] A dynamic element matching method (Dynamic Element Matching, DEM) has been proposed to solve the internal nonlinear problem of the DAC. Data Weighted Averaging (DWA) method is a common algorithm in DEM. In general, the advantages of DWA are as follows: first-order noise shaping can be achieved; it can reduce the mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/66
Inventor 洪嘉明张家玮彭彦华刘广治林重甫
Owner FARADAY TECH CORP
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