steven_l
Member level 1
Hi, friends
I am designing a passive mixer.
When I stimulate, I follow the pdf file” LAB2_Mixer_Tutorial”
I have two questions.
First:
As you can see in the schematic I have uploaded, RF PORT and LO PORT are all paralleled with a 50 Ohm resistor.
Why?
It is a necessary to add the 50 Ohm resistor?
In my opinion, a circuit actually does not contain the resistor. But when I stimulate noise figure, I find the resistor contribute noise to noise figure. Then it is the noise figure correct?
Second:
A off-chip bandpass filter will followed the mixer. The bandpass need 50 Ohm source and 50 Ohm load. Considering the isolation and driving capacity, I add a source follow buffer. The buffer has gm=20 ms.
In the circuit, the 50 Ohm resistor at the output of mixer represents the bandpass. Is it right?
Thank you all~~~
I am designing a passive mixer.
When I stimulate, I follow the pdf file” LAB2_Mixer_Tutorial”
I have two questions.
First:
As you can see in the schematic I have uploaded, RF PORT and LO PORT are all paralleled with a 50 Ohm resistor.
Why?
It is a necessary to add the 50 Ohm resistor?
In my opinion, a circuit actually does not contain the resistor. But when I stimulate noise figure, I find the resistor contribute noise to noise figure. Then it is the noise figure correct?
Second:
A off-chip bandpass filter will followed the mixer. The bandpass need 50 Ohm source and 50 Ohm load. Considering the isolation and driving capacity, I add a source follow buffer. The buffer has gm=20 ms.
In the circuit, the 50 Ohm resistor at the output of mixer represents the bandpass. Is it right?
Thank you all~~~