Difference between revisions of "PE4302 RF Attenuator"
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[[file:SWLEDX8-720px.jpg]] | [[file:SWLEDX8-720px.jpg]] | ||
| + | |||
| + | == Measurements == | ||
| + | |||
| + | * NanoVNA | ||
| + | * 1-300 MHz | ||
| + | * All switches set to GND | ||
| + | * Min -1.2 dB insertion loss | ||
| + | |||
| + | [[file:SW_All_0s.PNG]] | ||
| + | |||
| + | * All switches set to GND | ||
| + | * Min -1.2 dB insertion loss | ||
| + | |||
| + | [[file:SW_All_1s.PNG]] | ||
== References == | == References == | ||
Revision as of 10:45, 12 September 2021
Features
- PE4302 RF attenuator module
- Parallel immediate mode
- Program control gain attenuation range is from 0 to 31.5dB
- Bandwidth 1MHz to 4GHz
Specifications
- 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
My Design
- 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
Measurements
- NanoVNA
- 1-300 MHz
- All switches set to GND
- Min -1.2 dB insertion loss
- All switches set to GND
- Min -1.2 dB insertion loss
References
- 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".
