262 Quadrature VCO
262 : Quadrature VCO
- Author: Sylvain Munaut
- Description: Quadrature VCO with nominal target frequency of 240 MHz
- GitHub repository
- Open in 3D viewer
- Clock: 0 Hz
How it works
It's a 4 stage differential delay VCO. A comparator taps two of the stage to create a 4 phase single ended output.
Design nominal frequency is 240 MHz although the typical tuning range should be from ~ 120 MHz to ~ 500 MHz.
How to test
Power up, apply control voltage, observe oscillation.
External hardware
- Programmable precision voltage source
- Oscilloscope
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | out_0 | ||
| 1 | out_270 | ||
| 2 | |||
| 3 | |||
| 4 | |||
| 5 | |||
| 6 | |||
| 7 |
Analog pins
ua | PCB Pin | Internal index | Description |
|---|---|---|---|
| 0 | B12 | 18 | out_180 |
| 1 | B13 | 19 | out_90 |
| 2 | B14 | 20 | control |