Aiming to create 2 ring oscillators at around 600MHz and 300MHz. The output will be quite attenuated due to the pad.
To get a good output current, a 2 stage inverter is used with large drive transistors.
The output waveform of the 600MHz is expected to be as shown in the cyan trace (out_parax). The ring_out_parax and pre_drive_parax are internal signals. See the xschem test bench for more details.
Oscilloscope.
# | Input | Output | Bidirectional |
---|---|---|---|
0 | Enable ring 1 | ring_oscillator1 | |
1 | Enable ring 2 | ring_oscillator2 | |
2 | |||
3 | |||
4 | |||
5 | |||
6 | |||
7 |
ua | analog | Description |
---|---|---|
0 | 11 | |
1 | 6 |