13. Mismatch simulation of power synthesis for ads usage recording

13、ADS Mismatch simulation using recorded power synthesis

be based on ADS2022

The reference books are Mr. Lu Yifeng's ADS RF circuit design and simulation learning notes

Pre tutorial ：
01、ADS New projects using records
02、ADS Import various simulation models using records
03、ADS Use of records DC Use of simulation controller
04、ADS Use of records S Use of simulation controller & Design of elliptic low-pass filter
05、ADS Use the lumped parameters of the record to match
06、ADS Distributed parameter matching using records
07、ADS Use record matching Q value - Broadband and narrowband
08、ADS Design and optimization of low pass filter using recording
09、ADS Automatic design of filters using records
10、ADS Design high and low impedance filters using recording （ Including layout simulation ）
11、ADS Use of records LNA Design
12、ADS Use the recorded power divider design

1、 Briefly explain

In practice, it often occurs that the transmission power is very large , The power of a single amplifier is insufficient , More combinations are needed to synthesize . For example, four inputs are combined ,
under these circumstances , If some of the amplifiers fail, disconnect them , What impact will it have on the final output ？ Simulation is provided here to illustrate .

2、 Schematic drawing

New schematic , Name it mismatch_test, Follow the previous tutorial （12、ADS Use the recorded power divider design ） To design Wilkinson power divider ：

Copy and paste it , The combiner is designed to simulate the power amplifier （ Suppose there are four amplifiers in the middle of the circuit diagram , Four amplifiers naturally require four inputs , Here, use the power divider to practice the quartering of the original signal ）：

Insert S Parameter emulation control , Observe the port in normal operation S Parameters ：

Found the system in 2.4Ghz Normal operation at , The following is the mismatch simulation .

3、 Mismatch simulation

Mismatch simulation cannot be used S Parameters , You should use HB Control for emulation , That is, harmonic balance simulator （HARMONIC BALANCE）, Delete the previously inserted S Control , Insert HB Control , Set the center frequency 2.4Ghz, Order number is 5：

Change the input port to a single tone signal source , The frequency is 2.4GHz：

Insert the port in the middle , It is convenient to monitor the port later , It's called V1、V2、V3、V4、Vout：

Run the simulation , Select Insert formula on the left side of the simulation result window ：

The input formula is as follows , Represent the power of each line respectively ：

Select the insert list on the left side of the simulation result window ：

Add the formula you just entered ：

Click OK to view , It is found that the output is -0.2dbm：

4、 Disconnect all the way

Disconnect a line below , As shown below :

The theoretical analysis is as follows ：

Actual simulation results ：

5、 Disconnect two adjacent circuits

Schematic diagram ：

The theoretical analysis ：

actual ：

6、 Disconnect two non adjacent circuits

Schematic diagram ：

The theoretical analysis ：

Actual simulation :

7、 Disconnect three circuits

Schematic diagram ：

theory ;

actual ：