Abstract: A test instrument may include a transmitter configured to transmit signals to a unit under test, a receiver configured to receive signals from the unit under test, and a controller configured to generate a transmitter compensation filter by (i) transmitting, with the transmitter, complex multi-sine signals over a first plurality of observed frequencies within a predetermined baseband frequency range, (ii) estimating a first plurality of frequency responses that compensate for in-phase and quadrature (IQ) imbalance at the first plurality of observed frequencies within the predetermined baseband frequency range, and (iii) determining, using the first plurality of frequency responses, a transmitter polynomial surface, and to compensate, using the transmitter compensation filter, at least one of the signals to be transmitted by the transmitter to reduce IQ imbalance in the transmitted signals, including using the transmitter polynomial surface to calculate a frequency response that reduces the IQ imbalance in the

Abstract: A test instrument may include a transmitter configured to transmit signals to a unit under test, a receiver configured to receive signals from the unit under test, and a controller configured to generate a transmitter compensation filter by (i) transmitting, with the transmitter, complex multi-sine signals over a first plurality of observed frequencies within a predetermined baseband frequency range, (ii) estimating a first plurality of frequency responses that compensate for in-phase and quadrature (IQ) imbalance at the first plurality of observed frequencies within the predetermined baseband frequency range, and (iii) determining, using the first plurality of frequency responses, a transmitter polynomial surface, and to compensate, using the transmitter compensation filter, at least one of the signals to be transmitted by the transmitter to reduce IQ imbalance in the transmitted signals, including using the transmitter polynomial surface to calculate a frequency response that reduces the IQ imbalance in the

Abstract: A test instrument may include a transmitter configured to transmit signals to a unit under test, a receiver configured to receive signals from the unit under test, and a controller configured to generate a transmitter compensation filter by (i) transmitting, with the transmitter, complex multi-sine signals over a first plurality of observed frequencies within a predetermined baseband frequency range, (ii) estimating a first plurality of frequency responses that compensate for in-phase and quadrature (IQ) imbalance at the first plurality of observed frequencies within the predetermined baseband frequency range, and (iii) determining, using the first plurality of frequency responses, a transmitter polynomial surface, and to compensate, using the transmitter compensation filter, at least one of the signals to be transmitted by the transmitter to reduce IQ imbalance in the transmitted signals, including using the transmitter polynomial surface to calculate a frequency response that reduces the IQ imbalance in the

Abstract: A test instrument may include a transmitter configured to transmit signals to a unit under test, a receiver configured to receive signals from the unit under test, and a controller configured to generate a transmitter compensation filter by (i) transmitting, with the transmitter, complex multi-sine signals over a first plurality of observed frequencies within a predetermined baseband frequency range, (ii) estimating a first plurality of frequency responses that compensate for in-phase and quadrature (IQ) imbalance at the first plurality of observed frequencies within the predetermined baseband frequency range, and (iii) determining, using the first plurality of frequency responses, a transmitter polynomial surface, and to compensate, using the transmitter compensation filter, at least one of the signals to be transmitted by the transmitter to reduce IQ imbalance in the transmitted signals, including using the transmitter polynomial surface to calculate a frequency response that reduces the IQ imbalance in the

Abstract: A method and system for assuring quality control during data entry. Data sheets and other input are verified for quality control. Based on the number of data entry clerks or groups and the desired level of quality, a sampling plan determines the amount of duplicated data to process for inspection. Duplicated data is created randomly and the work is distributed among the data entry clerks. Once the data is extracted into attributes, the data is consolidated and inspected for quality. A computer program is used to group attributes from the duplicated data sheets and to flag for the user those attributes that differ from the two or more data entry clerks. An inspector investigates problems and chooses the correctly entered attribute. The inspector incorporates corrective measures into the data extraction method. Once all of the differences in attribute data have been resolved, based on the number of errors present, the data sheets are either rejected and reworked, or they are accepted.

Abstract: A method and system for building a database to be queried by a parametric search engine begins by receiving data concerning a set of products. Each product is mapped by a set of attributes representing characteristics of the products and values for those characteristics. For some attributes, there can be multiple values. Each of the multiple values is associated with a corresponding multiple value for another attribute, and thus defining a variation of the product. The data is inserted into a database such that the relationship among the interrelated values is retained, permitting a parametric search engine to provide a correct solution set for a query to the database. In one embodiment, the database is an XML database and the products for which the database stores are components for use by engineers during the Discovery phase of Research and Development.