MICRONIX

Tool for analysis of high frequency circuit design

Optium tool for analysis of high-frequency circuit design (High-frequency passive probe MP300)

[Application]

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 500Ω. Its ratio is quite lower than popular passive probe and FET probe.

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.

[Solution]

Probe comparison table
Scroll
Probe input impedance output impedance measurement Frequency range
(roughly)
Recital
R C
Oscillo
probe
(10:1)
10MΩ 10pF 9MΩ DC to 200MHz Adjusting phase of the probe is required
FET
Probe
100KΩ 1 to 4pF 50Ω DC to 1000MHz DC power supply is required
MP300 500Ω 0.25pF 50Ω DC to 6GHz input impedance is a little lower

Fig of simple circuit component

If this circuit is inputted 0dBm.Since there are three 10dBm amplifers on it, Implicit output level is +30dBm. When 50 Ω 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.

[Products introduction]

2010/2

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