Our sister site EDAboard.com hosts technical discussions on a variety of subjects, including test & measurement themes. Here are the top five recent conversations oriented around making measurements.
Impedance using Network analyzer and Agilent ADS — “I have a 1 port network. iI connect it to the network analyzer to measure impedance. It gives me a value R+j*X. Now I want to match it to 50 Ohms for my frequency. I have Agilent ADS as a software tool to calculate impedance. Should I put R+j*X in Agilent ADS Smith chart utility or a conjugate of it (R-j*X)”…..
[AVR]MCU-controlled power supply project — Hello everyone. I am designing a lab power supply that will be controlled by a AVR microcontroller, but I am not very knowledgeable regarding MCUs and I have some different approaches to how to implement the control part of the circuit. The supply has two identical isolated channels(0-30V/2,5A), the output voltage and the current limit is set by individual one channel DACs and the output voltage and actual current through the rail is read by a 4 channel ADC…….Read more
Why s12 isn’t equal to s21?? — When I measure a project constructed using a Wilkinson (power divider), the measured s12 and s21 must be equal, as in simulation in ADS (Advanced System Design) software, and because it is a reciprocal network. But in reality, in the Agilent VNA (vector network analyzer), the shape of s12 isn’t equal to the shape of s21. Why?….Read more.
Port impedance of Agilent Network Analyzer –– Hello Friends, anybody know how to change the port impedance of an Agilent Network Analyzer? For example, if I want to measure a matching network of 20-50 ohm measurements, how do I change the impedance of port 2 to 20 ohms in the network analyzer? I have done this with Anritsu gear but I can’t find any option to do so on the Agilent. Can anybody help me??….Read more.
Impedance Measurement of a 24 GHz Rectifier — Hey all, I have designed a 24 GHz full wave Greinacher-Rectifier (with diode connected transistors). Now I want to measure it’s impedance. But: The measured impedance deviates from the simulated impedance! ……….The deviation at low frequencies seems acceptable. But I totally don’t understand the deviation at high frequencies (especially why the imaginary part is positive)! The simulation results more or less coincide with values from literature…….Read more.