{"id":2266,"date":"2010-02-01T00:00:54","date_gmt":"2010-01-31T15:00:54","guid":{"rendered":"https:\/\/micronix-jp.com\/?p=2266"},"modified":"2023-03-20T17:28:09","modified_gmt":"2023-03-20T08:28:09","slug":"mp300-sol","status":"publish","type":"post","link":"https:\/\/micronix-jp.com\/english\/note\/application\/mp300-sol.html","title":{"rendered":"Tool for analysis of high frequency circuit design"},"content":{"rendered":"

Optium tool for analysis of high-frequency circuit design \uff08High-frequency passive probe MP300\uff09\n\n<\/p>\n

Application<\/h2>\n

MP300 is a passive probe that has a wide frequency range and low input capacitance. It is used in connected with measurment equipment (Spectrum analyzer or Oscilloscope). Danping ratio is 10:1 for that MP300's input resistance is 500\u03a9. Its ratio is quite lower than popular passive probe and FET probe. <\/p>\n

Operator is demanded a little attention when measure the circuit in low frequency range (DC-XXKHz) However,since this probe is low input capacitance and low impedance, it has favourable frequency response in high frequency range. It is useful for analysis and diagnostics on high-frequency circuit design.<\/p>\n\n\n\n

Solution<\/h2>\n\n

Configuration<\/h3>\n\"Figure:Configuration\"\n\n

Performance table<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n\n
Item<\/th>\nSpecification<\/th>\n<\/tr>\n
frequency bandwidth\uff08-3dB\uff09<\/td>\n6GHz<\/td>\n<\/tr>\n
attenaution ratio<\/td>\n10:1\u00b12%
\n(50\u03a9\u00b11% connected load)<\/td>\n<\/tr>\n
input resistance<\/td>\n500\u03a9\u00b12%
\n(50\u03a9\u00b11% connected load)<\/td>\n<\/tr>\n
input capability<\/td>\n0.25pF(typ)<\/td>\n<\/tr>\n
cable length<\/td>\n1m<\/td>\n<\/tr>\n
connector shape<\/td>\nSMA<\/td>\n<\/tr>\n
input voltage endurance<\/td>\n10Vrms, 20Vpeak(PW<1ms)<\/td>\n<\/tr>\n
operating temperature range<\/td>\n5 to 35\u00b0C<\/td>\n<\/tr>\n
operating humidity range<\/td>\nLess than 85%RH
\n(non condensing)<\/td>\n<\/tr>\n
storage temerature range<\/td>\n-20 to 70\u00b0C<\/td>\n<\/tr>\n<\/tbody><\/table>\n\n\n\n\n

Probe comparison table<\/h3>\n\n\n\n\n\n\n\n
Probe<\/th>\ninput impedance<\/th>\noutput impedance<\/th>\nmeasurement Frequency range
\n(roughly)<\/th>\n		Recital<\/th>\n<\/tr>\n
R<\/th>\nC<\/th>\n<\/tr>\n
Oscillo \nprobe
\n(10:1)<\/td>\n		10M\u03a9<\/td>\n10pF<\/td>\n9M\u03a9<\/td>\nDC to 200MHz<\/td>\nAdjusting phase of the probe is required<\/td>\n<\/tr>\n
FET \nProbe<\/td>\n100K\u03a9<\/td>\n1 to 4pF<\/td>\n50\u03a9<\/td>\nDC to 1000MHz<\/td>\nDC power supply is required<\/td>\n<\/tr>\n
MP300<\/td>\n500\u03a9<\/td>\n0.25pF<\/td>\n50\u03a9<\/td>\nDC to 6GHz<\/td>\ninput impedance is a little lower<\/td>\n<\/tr>\n<\/tbody><\/table>\n\n\n

Fig of simple circuit component<\/h3>\n

\"Figure:Fig<\/p>\n\n

Suit for comparison of simulation\nresults and failure analysis on\ndesign of high-frequency. <\/p>\n

*Indicate is 20dB lower than a given level by using 50\u03a9 line measuring equipment for that probe input impedance is 500\u03a9.
\n*20 log 50 \/ 500<\/p>\n\n\n

If this circuit is inputted 0dBm.Since there are three 10dBm amplifers on it, Implicit output level is +30dBm. When 50 \u03a9 lines Measuring equipment doesn't indicate +10 dBm on output point. ,there is a defect on this cirucuit. Measuring each point (P1,P2,P3,P4,) by using this probe that can caluculate where circuit defect arise.<\/p>\n\n\n\n

Products introduction<\/h2>\n