Apr 26, 2015 #1 9 93413245 Newbie level 4 Joined Apr 26, 2015 Messages 6 Helped 0 Reputation 0 Reaction score 0 Trophy points 1 Activity points 35 Hi everyone! I'm trying to design the most basic configuration of distributed amplifier I have simulated it in ADS and the problem is that it does not amplify and gives me a negative gain over the frequency range 1G to 20GHz. This is my Schematic Could anyone help me with that please? Thanks in advance
Hi everyone! I'm trying to design the most basic configuration of distributed amplifier I have simulated it in ADS and the problem is that it does not amplify and gives me a negative gain over the frequency range 1G to 20GHz. This is my Schematic Could anyone help me with that please? Thanks in advance
Apr 26, 2015 #2 FvM Super Moderator Staff member Joined Jan 22, 2008 Messages 52,392 Helped 14,748 Reputation 29,778 Reaction score 14,091 Trophy points 1,393 Location Bochum, Germany Activity points 297,965 The amplifier is missing a power supply.
Apr 27, 2015 #3 BigBoss Advanced Member level 6 Joined Nov 17, 2001 Messages 5,950 Helped 1,609 Reputation 3,225 Reaction score 1,592 Trophy points 1,393 Location Türkiye Activity points 35,759 If you use small signal s-parameter model of the transistors, it will give you a Gain. You used non-linear models that need bias circuit.
If you use small signal s-parameter model of the transistors, it will give you a Gain. You used non-linear models that need bias circuit.
Apr 27, 2015 #4 D.A.(Tony)Stewart Advanced Member level 7 Joined Sep 26, 2007 Messages 9,000 Helped 1,823 Reputation 3,645 Reaction score 2,196 Trophy points 1,413 Location Richmond Hill, ON, Canada Activity points 59,529 How did you calculate gain and model the transmission lines? Did you choose a MESFET from the library? Av = ½ n·gm·Zo, where n is the number of stages.
How did you calculate gain and model the transmission lines? Did you choose a MESFET from the library? Av = ½ n·gm·Zo, where n is the number of stages.
Apr 27, 2015 #5 9 93413245 Newbie level 4 Joined Apr 26, 2015 Messages 6 Helped 0 Reputation 0 Reaction score 0 Trophy points 1 Activity points 35 SunnySkyguy said: How did you calculate gain and model the transmission lines? Did you choose a MESFET from the library? Av = ½ n·gm·Zo, where n is the number of stages. Click to expand... No I chose a FET from linear models, and I calculated gain from G = gm*N^2 *Zg^2*Zd^2/4 as mentioned in David Pozar's book.
SunnySkyguy said: How did you calculate gain and model the transmission lines? Did you choose a MESFET from the library? Av = ½ n·gm·Zo, where n is the number of stages. Click to expand... No I chose a FET from linear models, and I calculated gain from G = gm*N^2 *Zg^2*Zd^2/4 as mentioned in David Pozar's book.
Apr 27, 2015 #6 9 93413245 Newbie level 4 Joined Apr 26, 2015 Messages 6 Helped 0 Reputation 0 Reaction score 0 Trophy points 1 Activity points 35 I have used a FET from the linear models. Does it still need a power supply?
Apr 27, 2015 #7 9 93413245 Newbie level 4 Joined Apr 26, 2015 Messages 6 Helped 0 Reputation 0 Reaction score 0 Trophy points 1 Activity points 35 BigBoss said: If you use small signal s-parameter model of the transistors, it will give you a Gain. You used non-linear models that need bias circuit. Click to expand... I have used FET from linear models. Does it still need a bias circuit?
BigBoss said: If you use small signal s-parameter model of the transistors, it will give you a Gain. You used non-linear models that need bias circuit. Click to expand... I have used FET from linear models. Does it still need a bias circuit?