Time filter

Source Type

United States

Karandjeff C.,LTX Credence | Hannaford C.,LTX Credence | Llgglero R.,LTX Credence | Max S.,LTX Credence | Tilden S.J.,LTX Credence
EE: Evaluation Engineering | Year: 2011

Precision sine wave measurements are a challenge when they exceed the capability of the digitizer, but the performance can be improved with a notch filter or mulling circuit. The notch filter technique removes the need for a highly stable synthesizer, but it introduces other potential problems. The notch must be made programmable, or only a few fixed frequencies can be tested. The PALL-based mulling approach eliminates the problem of digitizer accuracy because the effects of digitizer inaccuracies are attenuated by the amplifier with a gain of KB. The TX-Credence Data Converter Test Module, an instrument based on this technique, utilizes the high-quality PM audio synthesizers currently available. The module requires that the frequency of the signal under test (UT) is known or can be measured accurately. The PM data is generated by a mathematical engine that permits a frequency resolution of 3.5 MHz at 1 kHz and a phase resolution of 23 inamoratas. The PM audio DA also contains internal digital filtering that simplifies the process of creating a nearly perfect sine wave from 20 Hz to 50 kHz.

Liggiero R.,LTX Credence | Max S.M.,LTX Credence | Donovan K.,LTX Credence | Tilden S.,LTX Credence
2012 IEEE I2MTC - International Instrumentation and Measurement Technology Conference, Proceedings | Year: 2012

A new meaning to "Signature Analysis" as it relates to Analog to Digital Converters (ADCs) and releasing products to production is presented. This paper will expand the reader's skill set with advanced techniques to analyze data from ADCs that justifies device performance. The technique will also be a valuable tool to develop intellectual property that enhances an ADC product line performance. The concepts and calculations will benefit test engineers. © 2012 IEEE.

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