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| IMS resistors with partial wraparound - RF Cafe Forums | ||||||
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Below are all of the forum threads, including all the responses to the original posts. Peter Post subject: IMS resistors with partial wraparound Unread postPosted: Wed Jun 29, 2005 4:12 pm I am reading about IMS resistors, that are said to be more suited for microwave performances than standard SMT resistors. Does anybody know if it is stricly a question of wraparound? For example I saw simulations with manufacturer's model on ADS comparing kemet resistors and IMS. For 0805 package between 1 and 2 GHz there was a significant slope 1dB on the attenuation. For the IMS resitors however this slope was minimal. I am suprised that just this wraparound question would cause such a difference. Anybody experienced the same? Any comments? Top Guest Post subject: Unread postPosted: Tue Jul 05, 2005 1:08 pm Wraparound certainly is a big part of it. A lot depends on the value of the resistor and the intended use. For large value resistors, the wraparound can add a signficant parallel capacitance term. For low value resistors, the wraparound can add a significant series inductive term. The method of attachment can also be a significant factor. For example, about 20 years ago I designed a transimpedance amplifier that used a descrete resistor to set the transimpedance gain (for a fiber optic receiver application). I use a non-wraparound resistor (from IMS and others) because the sub-pF capacitance from the wraparound termination would dramatically affect the bandwidth (due to the multiplication from the amp). Posted 11/12/2012 | ||||||
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