Simple bias circuit needed

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ebuddy

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simple bias

Need to design a simple relaxation oscillator. Want it to be small and simple. Frequency can be anywhere between 10-30MHz. What is the simplest bias circuit that can provide the OP for the osc, when PVT changes. (temperature 0-85, vdd 3.0-3.6). Will a resistor plus a diode-connected nmos do?

Thanks.
 

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