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In order to get S11 a circuit must have impedance matching, however, matching network could be off chip and it is supposed to be in the physical implementation but no necessarily on chip.
You need to create a group with read/write permissions for all group members in the operating system. Then they could access project files, but when someone open a schematic, layout, etc.; the others users only have read permission.
In order to optimize a LNA you must define a FOM expression based on LNA's characteristics, such gain, noise, power consumption and other. Using a FOM in an optimization algorithm allows it to improve performance. On the other hand, such algorithm could be implemented by using genetic algorithms.
There are a lot of features and prices, but you must respond the question, how much money do you have?. For lighter weight consider a netbook. Less expensive than a laptop, smaller screen may be unacceptable, however, netbooks lack a DVD/CD drive. On the other hand, I have an HP and ACER...
Nanometer silicon CMOS has many advantages for low power consumption, and when it is combined with gm/Id methodology a very low power designs can be obtained, then it is a good choice for low power. On the other hand, I don't have much experience with high power.
Change technology allows to improve circuit performance, but when technology parameters are changed a circuit should be recalculated. In my experience I have to adjust sizing for some circuit designs when I change technology. In the other hand, if operating point is different at the new circuit...
When you have an amplifier with gain < 1, then output is decreased respect to input and you don't require an attenuator (see https://www.edaboard.com/threads/17051/). On the other hand, compromise between bandwidth and gain allows to increase bandwidth when gain is reduced. Of course, you have...
For circuit design you must do some type of analyzes:
1) Temperature: you verify temperature effect on designed circuit.
2) MonteCarlo: it allows to check how element variation can degrade circuit performance.
3) You must consider worst values for elements, because they can limit circuit...
You can achieve a delay by using a buffer, where delay is controlled by a grounded capacitor implemented between stages. On the other hand, you can use more capacitance in order to increase delay. It could be on or off chip, but remember than you have more control if it is integrated.
An amplifier could be an attenuator when it has a voltage gain less than 1. On the other hand, using an opamp allows to improve drive capability because its output impedance.
It is important to choose the LNA topology first, because forward-gain or noise performance could be a limitation. After selecting the correct topology you must design matching networks (output matching network if it is a stand-alone LNA). In order to get a gain of 30dB a second stage could be...
S parameters must be calculated considering coupling capacitors, where they could be on or off chip, because S parameters performance is changed by adding an element, mainly S11 and S22 respectively. On the other hand, is your intention is to get amplifier performance, you can assume ideal...
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