You use "E" as half of open circuit voltage of port.Your usage of symbol "E" is not common.Generally "E" is used like following.
See
http://www.designers-guide.org/Forum/YaBB.pl?num=1122952471/2#2"E" is used as an open circuit voltage of port generally.steven_l wrote on Jun 28th, 2010, 7:59am:I wonder if the E means PAC mag of RF POIRT in cadence?
Yes,
if you mean "E" as half of open circuit voltage of port.steven_l wrote on Jun 28th, 2010, 7:59am:how can a port with E can generate a 2E at the gate of mosfet?
This is because an input impedance of gate is very large.
steven_l wrote on Jun 28th, 2010, 7:59am:Then Voltage gain of transient means Vout/Vin= Vout/E.
No.
Conventional voltage gain is Vout/Vin not Vout/E,
even if you mean "E" as half of open circuit voltage of port.steven_l wrote on Jun 28th, 2010, 7:59am:Why not Vout/2E?
Because the signal at gate is 2E
If an operation frequency is fairly low, Vout/Vin is almost same as
Vout/(2E),
if "E" is half of open circuit voltage of port.steven_l wrote on Jun 28th, 2010, 7:59am:I wonder if the input node means the + terminal of port or vsin?
Yes, Vin is a voltage measured at that node.
steven_l wrote on Jun 28th, 2010, 7:59am:As mixer is a RF block, it seems that the voltage conversion gain Vout/(E/2) is correct.
Say, PAC plot in Direct Plot is correct.
No, you are misunderstanding.
Both gains are correct.
But Vout/Vin is more useful and practical gain definition than Vout/(E/2) in IC chip.
Here "E" is an open circuit voltage of port.steven_l wrote on Jun 28th, 2010, 7:59am:You are misunderstanding.
manfred wants to get Vout/Vin. But he gets Vout/(E/2) using "Direct Plot". I mean this is not correct.
Here "E" means an open circuit voltage of port.steven_l wrote on Jun 28th, 2010, 7:59am:I parallel a 50 Ohm resistor with PR port and LO port, respectively.
What do you mean by "
PR port" ?
steven_l wrote on Jun 28th, 2010, 7:59am:You are misunderstanding.
For your case, 50ohm resistors are part of your circuit. So the simulation results are correct.
See
http://www.designers-guide.org/Forum/YaBB.pl?num=1207009725/1#1The followings are general notes for you.
- Always describe correct tool's name and vendor's name which you use as tool or simulator.
- Don't do multiple posts which are same content.
- Don't request source code or behavioral model without any efforts.
- There are many simulators which have analyses called as PSS, PAC and Pnoise.
- Describe in detail with using correct terminologies.
- Warnigns are different from Errors.
- ADS is not name of simulator.
- There is no tool which name is Cadence.
- Don't use Direct Plot of Cadence ADE blindly without knowing definition.
-
All gains in Direct Plot of Cadence ADE are "right", "true" and "practical" voltage gain.- Don't mix up Simulation with Post Processing. They are completely different phase.
- MATLAB are different from Simulink.
- Learn measurements using actual instruments. Not "EDA Tool Play