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Below are all of the forum threads, including all the responses to the original posts. Guest Post subject: Gain expansion Unread postPosted: Fri Jul 15, 2005 2:04 am Hello, In a three stage amplifier that I have designed (pHEMTs as active devices), I am noticing an substantial gain increase (about 3 dB) with input power. The small signal gain is down 4 dB from the simulated value but starts to go up with input power before the gain starts to compress. The gain 'expansion' is also so steep it almost looks like there is a discontinuity in the Gain/Pin curves. Return losses are close to simulated values. Any ideas on what might be causing this? Top IR Post subject: Unread postPosted: Fri Jul 15, 2005 2:43 am Offline Site Admin User avatar Joined: Mon Jun 27, 2005 2:02 pm Posts: 373 Location: Germany Hello, The situation you described is common in several transistor technologies. It is mostly related to bias level the transistor gets and can be emphasized or de-emphasized with lower or higher bias respectively. This gain expansion as gain compression is considered as non-linearity. You can make this useful, if you plan to use some sort of of linearization scheme for your amplifier. _________________ Best regards, - IR Top Profile IR Post subject: Unread postPosted: Mon Jul 18, 2005 12:53 pm Offline Site Admin User avatar Joined: Mon Jun 27, 2005 2:02 pm Posts: 373 Location: Germany Just a clarification to my previous post: By bias level, I meant for example the Vgs voltage level in JFET's/MESFET's _________________ Best regards, - IR Posted 11/12/2012 | ||||||
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