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hello everyone
im trying to matching my mixer to the 50 ohm and for matching i adding resistors to the cell but when i do this linearity is decreasing substantially why this is like that and how to i avoid this situation
thanks
hello everyone
i took the example circuit from RF Electronics Design and Simulation by Cornelis J. Kikkert and i want to know why did he use output buffer what is the advantage of the buffer is there any relation about DC voltage level i mean is it used for the voltage shifting? if so how do we...
its not about the circuit i dont know to use the awr design properly so that just want to know how to determine 1-dB compression point i mean in which measurement i should use in the program
Hello everyone,
I want to determine the 1dB compression point of my mixer circuit but i dont know how to do it on the awr design can you help me about that.
thanks
hi,
can you help me how can i improve the noise figure of the gilbert bjt circuit i dont know why the noise figure is so high do i do somethings wrong
can you help me about that. Is this because of biasing?
also the IP3 is so bad. why this is like that. what do i do wrong?
Hello everyone in the circuit below i want to design a mixer where operates at higher frequencies. How should is make the biasing for the better design.
thanks in advance
Hello everyone
What should be the bias points for the proper working BJT gilbert cell and what is the relation between the current on the circuit and the circuit specifications. of course i want higher linearity and low noise but what should be the current on the circuit. and i'm having a...
is this because the frequency limitation, should i use RF transistors i mean the bandwidth of the transistor must be higher that the operation freq. of the mixer right?
i want to design a double-balanced gilbert mixer circuit where the LO 5 Ghz and the RF 4.9 Ghz and the IF 0.1 Ghz and , want to know that what should i care while choosing the right transistor for the good result. can you give me some recommendations. thanks in advence
currently i am working on a gilbert mixer circuit and on the awr design i get linear conversion gain even if i change the collector resistances and also the gain is so low how can i fix that can you help me about that
thanks for your generous replies also i want to ask a question about a mixer designing after i research many mixer topologies i decided to design a mixer by using double balanced gilbert cell which have 5 Ghz LO and and a 4.9 Ghz RF signals. which parameters do you think should i consider i mean...
wow its very interesting to get replied by someone who is one of the co-writers of the book. thanks for your reply again.
i design the circuit on the AWR by setting the resonant freq as 28 Mhz but i cannot any result at the AWR. it says there are no items to show even though i set the spectrum...
i also know the 50 ohm matching is the best.
do you know why the book says like that and is there any relationship between the impedance and the frequency?
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