265 Ring Oscillators

265 : Ring Oscillators

Design render
  • Author: Matt Venn
  • Description: Ring Oscillators using analog output pins
  • GitHub repository
  • Clock: 0 Hz

How it works

Aiming to create 2 ring oscillators at around 600MHz and 300MHz. The output will be quite attenuated due to the pad.

  • Ring oscillator 1 is made of 18 inverters and a NAND gate for enable.
  • Ring oscillator 2 is made of 36 inverters and a NAND gate for enable.

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.

output waveform

How to test

  • Enable 600 MHz oscillator 1 by setting user input pin 0 high and measure the signal at analog output 0.
  • Enable 300 MHz oscillator 2 by setting user input pin 1 high and measure the signal at analog output 1.

External hardware

Oscilloscope.

IO

#InputOutputBidirectional
0Enable ring 1ring_oscillator1
1Enable ring 2ring_oscillator2
2
3
4
5
6
7

Analog pins

uaanalogDescription
011
16

Chip location

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