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Has anyone tried using a single HMC980L4E (Active Bias Controller from Hittite) to bias multiple amplifiers?
My PCB has multiple amplifiers and I am trying to cut down the number of active bias controllers in my circuit to make the PCB smaller.
Thanks
John
When using transmission lines, those are ideal elements, thus you will definitely have a lower insertion loss. When using microstrip line model, they contain parasitic effect, which has more loss but provides a more accurate simulation result. Increasing the number of dividers (N-way), also...
For the LNA, you can plot the gain and noise circles on the smith chart. Usually, the max gain point and the min noise point do not occur at the same spot on the smith chart. You can pick somewhere in between these two points to do your impedance match, so that you have tradeoff between noise...
Depending on the typology and the number of splits (N).
The resistive type tends to suffer a higher insertion loss (S21 = -20 log N instead of -10log N).
Hi,
When designing a receiver, do you prefer to put the limiter before the bandpass filter or the bandpass filter before the limiter?
Assuming the filter components have high-power handling. What are the concerns?
Thanks
Dear all,
For design a PA, the optimum load impedances for the max gain and max power output fall on different places on the smith chart. Is there any way to bring these two points closer together, so that when I do the output matching, both max gain + max power output can be obtained...
Sorry, maybe i am not making myself clear.. I don't mean the sweeping frequency.. I mean the adaptive frequency or solution frequency to be set for the simulation.
adaptive frequency hfss
Hi, is there any tip on how to pick the appropriate adaptive frequency in HFSS Simulation?
From my understanding,
Broadband structure, use highest operating frequency for the adaptive frequency.
Filter/narrow band structure, use the center frequency for the adaptive...
Re: SiGe LNA
Hi Khouly,
Thank you for the recommendation, but do you have any link for the book so that i could at least identify the cover for the book, as i can't seem to find it in Amazon or google search.... Is the author/title correct?
Thanks
Hi,
I was wondering whether is there any good application notes/links/tutorial that is useful for designing SiGe HBT LNA using inductive degenerated cascoded architecture?
I did read some of the papers, the first step they do is to fix the emitter length and determine the optimum collector...
Hi,
For PA in WCDMA applications, which process is more preferrd, CMOS, SiGe HBT or GaAs?
What are the today trend for modulation schemes and spec for WCDMA?
Thanks
Any link that enable me to do my finding?
Hi,
I am cascading two or more amplifiers in serie together. I am worry about oscillation. Is there any way avoid/reduce oscillation? And perhaps, someone can start by explaining, what is main thing that causes oscillation when cascading the amplifier?
Thanks and appreciate that if...
I had attached the amp schematic.. The value were choosen initially so that SRF is above the operating frequency (DC to 6 GHz)
The 23.5 nH inductor, i intend to replace with ferrite EMI suppression bead BLM18HG102SN1D.
The 47 pF cap (DC block), i intend to replace with DC broadband cap.
From...
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