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Linearity corrector using filter products

A linear correction and filter technology, which is applied to instruments, analog-to-digital converters, analog/digital conversion calibration/testing, etc., can solve problems such as inappropriateness, filter correction not allowed, and inability to distinguish

Inactive Publication Date: 2006-08-09
TEKTRONIX INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it can be a useful subcase of the Volterra filter, it has disadvantages that make it unsuitable for systems with a good linear frequency response
The filter following the multiplier is not able to distinguish between the original component and the aliased component caused by the non-linear effects of the previous multiplication
Although additional filtering following the multiplier can provide some correction for frequency-dependent magnitude and phase responses in the signal path, aliasing does not occur when used in applications utilizing most of the Nyquist band. Allows the filter to correct for differences in magnitude response and phase between the original and aliased components

Method used

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  • Linearity corrector using filter products
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Embodiment Construction

[0025] As mentioned above, the previously proposed solutions are based on Volterra filters. However, since Volterra filters are very large and difficult to implement in conjunction with ADCs, a solution is needed that utilizes a more manageable filter design while still reducing some of the remaining major distortions. Taking the Volterra filter as a starting point, a generalized nonlinear filter system can be defined mathematically as:

[0026] y ( t ) = h 0 + Σ k = 1 n ( Σ j 1 = 0 N - 1 Σ j ...

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Abstract

A linearity corrector is provided that reduces distortion in a signal processing system, such as an ADC. The linearity corrector provides a first order signal path having distortion components connected to an adder, and a filter product circuit that is also connected to the adder. A method is provided for reducing distortion by calculating a filter product and adding the filter product to a first order signal having a relative delay such that the filter product reduces, or eliminates, the order of distortions corresponding to the order of the filter product.

Description

[0001] cross reference [0002] This application claims priority to US Provisional Application 60 / 625372, filed November 4,2004. technical field [0003] The present invention relates to linearity error correction, and more particularly to linearity correctors utilizing filter products to reduce or eliminate distortion produced by signal processing systems such as analog-to-digital converters (ADCs). Background technique [0004] Reducing the distortion produced by the ADC increases the spurious-free dynamic range (SFDR), which is useful for systems that use the ADC to acquire data such as spectrum analyzers, and other electronic measurement instruments. [0005] Modern high-speed ADC designs employ a deep clock pipeline to help accurately convert an analog input into a sampled digital representation through a series of refined steps. ADC designers put a lot of effort into eliminating apparent sources of nonlinearity in analog processing circuits. However, it is generally ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/10H03M1/12H03M1/34H03M1/36
Inventor K·R·斯拉文
Owner TEKTRONIX INC