525 Analog PLL
525 : Analog PLL
- Author: Jae Young Yoon
- Description: 2.4GHz targeted frequency synthesizer PLL
- GitHub repository
- Open in 3D viewer
- Clock: 0 Hz
How it works
Analog PLL targeted for 2.4GHz output, with a BGR circuit for the charge pump component.
You can find my detailed design process here: https://jyblue1001.github.io/
How to test
- Connect OUT_FREQ to a multimeter, as the initial control voltage is 0V, it should be naturally outputting a 2.18GHz signal.
- Connect REF_FREQ to a 20MHz signal. Either square wave of sinusoid are both are both ok as long as Vpp is 1.8V with respect to ground.
- Inspect OUT_FREQ, within the settling time of 3us, the PLL output will converge to a 2.4GHZ signal.
NOTE: I doubt it will work exactly as intended. The output frequency may not reach 2.4 GHz. If that’s the case, you might need to increase the input frequency.
External hardware
- Signal Generator (For the input)
- Multimeter (To detect the output frequency)
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | |||
| 1 | |||
| 2 | |||
| 3 | |||
| 4 | |||
| 5 | |||
| 6 | |||
| 7 |
Analog pins
ua | PCB Pin | Internal index | Description |
|---|---|---|---|
| 0 | B4 | 10 | REF_FREQ |
| 1 | B5 | 11 | OUT_FREQ |