Novel cost-effective passive intermodulation measurement technique using a single power amplifier

Measurement ◽  
2021 ◽  
Vol 176 ◽  
pp. 109118
Author(s):  
Raja Usman Tariq ◽  
Ming Ye ◽  
Lixiang Chen ◽  
Zhi Cao ◽  
Yongning He
Keyword(s):  
Power Amplifier ◽  
Measurement Technique ◽  
Cost Effective ◽  
Passive Intermodulation ◽  
Single Power

Temperature-Dependent Logic Failure in a GaAs Power Amplifier-Duplexer Module Caused by a Subtle Parasitic Schottky Diode

2014 ◽  
Author(s):  
Rose Emergo ◽  
Steve Brockett ◽  
Pat Hamilton
Keyword(s):  
Power Amplifier ◽  
Schottky Diode ◽  
Production Test ◽  
Temperature Dependent ◽  
Cold Temperatures ◽  
Collector Junction ◽  
Power Mode ◽  
The Difference ◽  
Base Contact ◽  
Single Power

Abstract A single power amplifier-duplexer device was submitted by a customer for analysis. The device was initially considered passing when tested against the production test. However, further electrical testing suggested that the device was stuck in a single power mode for a particular frequency band at cold temperatures only. This paper outlines the systematic isolation of a parasitic Schottky diode formed by a base contactcollector punch through process defect that pulled down the input of a NOR gate leading to the incorrect logic state. Note that this parasitic Schottky diode is parallel to the basecollector junction. It was observed that the logic failure only manifested at colder temperatures because the base contact only slightly diffused into the collector layer. Since the difference in the turn-on voltages between the base-collector junction and the parasitic Schottky diode increases with decreasing temperature, the effect of the parasitic diode is only noticeable at lower temperatures.

Power-amplifier characterization using a two-tone measurement technique

2002 ◽  
Vol 50 (6) ◽  
pp. 1590-1602 ◽  
Author(s):  
C.J. Clark ◽  
C.P. Silva ◽  
A.A. Moulthrop ◽  
M.S. Muha
Keyword(s):  
Power Amplifier ◽  
Measurement Technique

scholarly journals Development of a remote tending system for analog broadcast transmitters

2019 ◽  
Vol 15 (3) ◽  
pp. 1474
Author(s):  
Gerino Mappatao ◽  
Isaiah Mari Zebedia Bautista ◽  
Marc Kevin Orsos ◽  
Mark Aldrine Ribo ◽  
Joseph Castillo
Keyword(s):  
Power Amplifier ◽  
Supply Voltage ◽  
Cost Effective ◽  
Test Results ◽  
Internet Connection ◽  
Record Data ◽  
The Status ◽  
Last Stage ◽  
The Times ◽  
And Control

<span>Whenever a broadcast transmitter is on-air, it is required to be tended by licensed broadcast technicians. Technicians periodically monitor the transmitter performance, record the supply voltage and current at the last stage of the power amplifier and keeps a copy for at least two years. Also recorded are the times the transmitter is turned ON and OFF as well as the times the transmitter shuts down and returns back to air. This paper proposes a system to remotely tend analog transmitters in one central monitoring station. The remote tending of several transmitters in one location is made possible through internet connection. However, the challenge in the proposed system is in the gathering of transmitter data. A prototype of the system was constructed and tested in an FM broadcast transmitter. Test results on the prototype performance show that the proposed system can effectively be used to remotely monitor, record data and control the status of analog broadcast transmitters. The primary feature of the proposed system of monitoring several transmitters in one location will bring cost effective advantages to the broadcast operators. </span>

Measuring Consumer Attitudes toward the Marketplace with Tailored Interviews

1989 ◽  
Vol 26 (3) ◽  
pp. 311-326 ◽  
Author(s):  
Siva K. Balasubramanian ◽  
Wagner A. Kamakura
Keyword(s):  
Cost Saving ◽  
Item Response ◽  
Measurement Technique ◽  
Cost Effective ◽  
Consumer Attitudes ◽  
Attitude Scale ◽  
Potential Cost Saving ◽  
Potential Cost ◽  
Standard Error Of Measurement ◽  
Error Of Measurement

The authors demonstrate how item response theory can be applied for cost effective measurement of consumer attitudes with multi-item scales. The measurement technique they discuss and illustrate is tailored to each respondent so that each is asked only the scale items most informative of his or her attitude level. This approach yields attitude estimates from only a fraction of the total number of items in the attitude scale, with a measurable and controllable increase in the standard error of measurement. Potential cost-saving implications are discussed.

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