# Given a simplified equivalent circuit of an HEMT device as follows, work on the followings Cgd Gate

Given a simplified equivalent circuit of an HEMT device as follows, work on the followings Cgd Gate Drain Cgs Cds Rds Cgs = 285 fF Rds = 185 Ohm Cgd 25 fF gm 162 mS Cds = 60 fF Source (a) Assuming the source terminal of the device is grounded, derive the S-parameters at 10 (b) Based on your calculation in (a). calculate the K factor at 10 GHz and comment on the (c) Calculate the available power gain at 10 GHz if the input and output of the device are (d) Based on your calculation in (b). ?fK is smaller than 1, try to stabilize the device by GHz given the source and load terminations are 50 Ohms stability of this device at 10 GHz terminated by 50 Ohm. adding appropriate components to make K greater than 1. You need to show your approach with calculation to verify the results (e) Calculate the available power gain at 10 GHz again after you add the stabilization component. Compare the result you obtained with (c) (f) Design an output matching circuit (without stabilization component) to match the 50 Ohm termination to the conjugate of S22 at 10 GHz

Given a simplified equivalent circuit of an HEMT device as follows, work 2. on the followings: Cgd Gate Drain Cgs Cds Rds gm Cgs 285 fF Rds 185 Ohm Cgd 25 fF Cds 60 fF gm 162 mS Source (a) Assuming the source terminal of the device is grounded, derive the S-parameters at 10 GHz given the source and load teminations are 50 Ohms (b) Based on your calculation in (a), caleulate the K factor at 10 GHz and comment on the stability of this device at 10 GHz (e) Calculate the available power gain at 10 GHz if the input and output of the device are terminated by 50 Ohm. (d) Based on your calculation in (b), if K is smaller than 1, try to stabilize the device by adding appropriate components to make K greater than 1. You need to show your approach with calculation to verify the results (e) Calculate the available power gain at 10 GHz again after you add the stabilization component. Compare the result you obtained with (c) (f) Design output matching circuit (without stabilization component) to match the 50 Ohm an termination to the conjugate of S22 at 10 GHz

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