The circuit is a voltage-controlled ring oscillator (VCRO) using transmission gates as the delay control element. It is based on the paper:
Retdian, N., Takagi, S., & Fujii, N. (2002). Voltage controlled ring oscillator with wide tuning range and fast voltage swing. 2002 IEEE Asia-Pacific Conference on ASIC, AP-ASIC 2002 - Proceedings, 201–204. https://doi.org/10.1109/APASIC.2002.1031567.
Pinouts:
To test, apply control voltage v_control_n and v_control_p, where the sum of the two voltages should ideally be equal to the supply voltage of 1.8V.
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | out5 | ||
| 1 | out4 | ||
| 2 | out3 | ||
| 3 | out2 | ||
| 4 | out1 | ||
| 5 | out0 | ||
| 6 | |||
| 7 |
ua | analog | Description |
|---|---|---|
| 0 | 1 | out |
| 1 | 3 | vcon_n |
| 2 | 2 | vcon_p |