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Well, bypass capacitors are used to decrease voltage ripple on the supply line. Actually it means that you have to select proper capacitors to provide known impedance at known frequencies. When someone just added 100nF caps, well, this value is not related to the design. So, you can use caps...
ADS manual recommends to use 2D layers instead of 3D vias. So, just connect transformer layers by conductive or resistive surface.The size of this object should be near the size of the real via to include current spreading. To be near the real life you need to pick up via resistance from the...
zero if, dc offset
Hi,
At this time several techniques are used to provide dc offset cancellation.
On the first picture simple servo-loop is used to remove dc offset. Servo-loop likes high pass filter with cut off frequency about several kHz. So, received signal is damaged near dc. Usually...
Why not? Of cource, the value range is below 1...0.5pF. But at 10GHz you do not need more. Just for reference look at the site h**p://www.dilabs.com/products/products.aspx?catid=8
Rgds
Hi,
Well, speculations of echo47 are right till the statement that transformer "decreases the impedance by 1.5". Really transfromation factor of submitted configuration is R/n^2. So, the correct answer is 2*75/1.5^2=66.7Ohm.
Rgds
Hi,
VIA2 model is based on the numerical analysis of Goldfarb and Pucel. And limitation of thickness came from this work. For this reason I recommend to use VIA model.
Models of passive components are matured enough. I used microstrip components library till 30GHz. Design was confirmed by HFSS...
Hi,
Really interesting question.
D.Pozar in "Microwave Engineering" defines microwaves as AC signal with frequencies between 300MHz to 300GHz. Moreover frequency range from 3MHz to 300MHz is considered as RF. But this definition argues with manuals like "RF Microelectronics" (Razavi) where RF...
Re: what's the relationship between amplifier's linearity an
2 divan:
If NF and IIP3 are defined by bias condition it does not mean that there is direct relation between these parameters (it is the topic of this thread).
Moreover as to MOSFETs at some bias current we can get maximum IIP3...
Re: what's the relationship between amplifier's linearity an
Hi,
I agree that there is not direct relation between NF and linearity.
NF is defined by dissipative components of a transistor. And it is very important that because of low level of noise signal any nonlinearity is not considered...
Hi,
Usually design flow of any amplifier includes the next steps:
- check stability of selected transistor
- design matching circuits to provide stable operation, may be by using resistive components (Sometimes you can read that input and output terminations of LNA in stable region is enough...
Re: [HELP] LNA Design
Hi,
You use in your design cascode configuration with resistive feedback. In this case input impedance is equal to (Rl+Rf)/(1+gm*Rl), where Rl and Rf are the load impedance and feedback resistor respectively. Moreover input impedance can be estimated as Rf/Gain. In...
Really Razavi says about digital modulation (p.128). For this reason the picture is not correct. Output of digital modulator in common case is described as a(t)cosΘcos(ωt) - b(t)sineΘsine(ωt) (thanks to nandgates for formular). If we can neglect amplitude mismatch, a(t) = b(t), then input signal...
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