Jacki
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Hi,
Your information is too little, and it is difficult to get a conclusion from the figure you attached. Generally when you increase the current in the ring oscillator, the frequency will be increased linearly (almost), but you need to consider if your ring oscillator is CMOS inverter, current-starving inverter or current-steering inverter with diode clamp based. The load capacitor is different, and you need to look at the settling time.
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