Recent content by olinn

Thanks for the tips!

Thanks for both your information! Yes. I have an old HP 8722C network analyzer up to 20GHz. The max. output is 10dBm. Does it mean the Vpp is sqrt(2*0.01W*50Ohm) = 1V ? I checked a HP 70843A pattern generator which accepts 0.45~0.9V Vpp. So I guess voltage should be okey. VE1BLL, you mentioned...

Hi, I am new to communication testing. I want to measure eye diagram for a 10Gb/s optical receiver. The common approach is to feed an optical modulator with PRBS patterns from a pattern generator input from a 10Gb/s clock source and use the optical modulator to modulate optical signal for DUT...

Thanks for the comments. I am using an open-source 2D semiconductor device (such as CMOS) simulator. It basically solves a system of three non-linear differential equations. I constantly met non-convergence problems. The author suggests to use all relevant libs (e.g. lapack, blas, petsc) double...

I'm using Debian Lenny. I want to know how I can check if my lapack,cbas lib support long double type. If these libs don't support long double. I need to download the source and re-compile them with long-double option. If I do this, do the compiled new libs overwrite the old libs (which don't...

I always use matlab in a terminal window on Debian Linux to avoid sluggish and buggy java virtual machine. But I found what really bother me is how to look up documentation conveniently since the default documentation coming with matlab can only be opened by java. I know Mathworks has an...

I used to grow materials using UHVCVD on Si wafer. To prepare the wafer, we usually did RCA cleaning followed by N2 spin dry. And the growth was successful. Recently, we want to try some growth on Si/Ge pieces, but have this surface preparation problem. The spin dry machine can only accept 4" or...

I want to put some electronic device components (i.e. diode laser package, some wires, connectors, ...) together to make a whole device. Do you have any idea what kind of storage or package materials i can use to easily assemble them, by using, like screw, glue, anything... Anyway, i just want...

How to change the font size of tick label in a figure in my codes? Thank you!

no. I need to know the current running m-file path dynamically to keep the m-file function has better adaptability when moving the m-file.

i got an ugly way, s = mfilename; s = which(s); then delete the mfile name in the string s.....

no, when pwd used in m-file, it still returns the current work directory of matlab, not the m-file directory itself.

I want to open a file with the path like this [current m-file dir]\file\filename.txt. I found i cannot do like just textread('file\filename.txt'..) in the m-file. so i think i should know the m-file directory itselt first, then do the job. do anyone know how to do this? thank you!

sorry for the confusion! I don't know this field at all. I am doing some GPIB control for some electronic devices currently, but find the only thing in my whole setup up I cannot remote control is this cryostat. The crystat is an old APD cryogenics. it uses a 208V voltage source and I don't...

I don't know whether or not it is appropriate to ask here. I want to programmably remote switch on/off a He compressor cryostat machine. I plan to take apart the front panal of the machine, disconnect the circuit behind the "start" button and insert a programmable remote switch device. Is it...