Difference between revisions of "PE4302 RF Attenuator"

Revision as of 11:01, 12 September 2021

Power Supply Voltage
- 2.7-3.3 VDC - 3V typical
- Typical current 5mA
Program control gain attenuation range
- 0~31.5DB
- 10K pull down resistors to ground
- Step size: 0.5DB
Input/Output Impedance
- 50 ohm
Bandwidth
- 1MHz~4GHz
- Attenuation value will differ under different frequency
Max Input power (50Ω)
- +30 dBm
- 1W = 7.1V RMS
Connectors
- SMA-female

A lot of designs use Arduino/OLED, etc to control the card - unnecessary
- Could add noise from OLED
- Doesn't need to switch too often
Mount in small 80mm x 50mm x 20mm project box
SMA connectors
- Board connector for one SMA
- Short cable male SMA to SMA female bulkhead SMA for other end
PE6402 remove straight header, replace with right angle connector over card
Mini360 Adapter Board for wide input voltage range
- 4.75-23V input
- 3V output
- Concern over EMI?
- Right angle connector 2x3 min
Use SWLEDX8 to control attenuation selection
- Right angle 2x10 under card for low profile installation
- Use SW1-SW6 switches (centered horizontally on card)
- Digital Input High 0.7xVDD in V = 2.1V
- Using 1.2K-1.5K pullup to counter the 10K pulldowns on the card = 2.6V
- When switch is on/low - 3V / 1.5K = 2 mA
- Adds to current 2 mA x 6 = 12 mA when all switches are low
- Use D7 for power indication
  - Vf = 1.8V, 3V-1.8V = 1.2V, 3 mA for lower light level - use 470 ohm resistor
Cabling
- 1x7 pin PE4302 connector (Use 1x8, ignore 8th pin)
- 2x10 Dupont connector for SWLEDX8
  - Ground, power to D7 LED, 6 switches
- 2x3 Dupont connector with pins from Mini360 Adapter Board

DuWayne's Arduino based attenuator
- Hackaday project page
Peregrine Semiconductor's page - Chip maker
PE4302 tswfi - Simple attenuator built with PE4302 and Arduino "pro micro".
- PE43xx Arduino Library

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 [[file:SW_All_0s.PNG]]
+* S21 Gain zoomed in
 [[file:SW_All_0s-ZoomedIn.PNG]]