# TestReport for CDCFE-Fanout-Baord V0.1<br> Circuit, Simulation, Board

## 1. Circuit
* [OPA2674](https://www.ti.com/lit/ds/symlink/opa2674.pdf)
* General OPA
* 200-NTD
* 
* [OPA3692](https://www.ti.com/lit/ds/symlink/opa3692.pdf)
* fixed resistor in IC, Setting gain is not very flexable
* 300-NTD
* 
* LDO power circurt
* Both OPA2674-impl and OPA2674-impl apply the same ciruit of power
* +5V LDO: [MCP1727](https://ww1.microchip.com/downloads/en/DeviceDoc/21999b.pdf)
* 30-NTD
* -5V LDO: [LT3015MSE](https://www.analog.com/media/en/technical-documentation/data-sheets/3015fb.pdf)
* 300-NTD
* 

## 2. Board
* Front
* 
* Back
* 

## 3. Simulation

### 3.1 With 50-ohm End Load, G = 2

* Vpp = 1V
* OPA2674 @10MHz (RF=680 ohm, RG=680 ohm)
* 
* OPA2674 @1MHz (RF=680 ohm, RG=680 ohm)
* 
* OPA3692 @10MHz
* 
* OPA3692 @1MHz
* 
* Vpp = 0.1V
* OPA2674 @10MHz (RF=680 ohm, RG=680 ohm)
* 
* OPA2674 @1MHz (RF=680 ohm, RG=680 ohm)
* 
* OPA3692 @10MHz
* 
* OPA3692 @1MHz
* 

### 3.2 With 50-ohm End Load, G = 4

* Vpp = 1V
* OPA2674 @10MHz (RF=1k ohm, RG=330 ohm)
* 
* OPA2674 @1MHz (RF=1k ohm, RG=330 ohm)
* 
* OPA3692 @10MHz
* 
* OPA3692 @1MHz
* 
* Vpp = 0.1V
* OPA2674 @10MHz (RF=1k ohm, RG=330 ohm)
* 
* OPA2674 @1MHz (RF=1k ohm, RG=330 ohm)
* 
* OPA3692 @10MHz
* 
* OPA3692 @1MHz
* 

## 4. Set G = 4 from G = 2

* If your source is general FuncGen, default G = 2 is enough and good to use
* [Refer to here](https://edadocs.software.keysight.com/kkbopen/why-your-function-generator-outputs-twice-the-programmed-voltage-589745012.html)
* But if circumstance is this case, I recommend set gain to 4
* 
* Answer: A = 4
* How to do?
* OPA2674
* 
* 
* OPA3692
* 
* 
* Note:
* If you set OPA2674's RG = 402, RF = 100. Result of simulation will very close to OPA3692, also get better good Frequency respose.(But overshoot will be worse)
###### tags: `CDCFEReport` `DeWei`