A 470‐990 MHz ring oscillator with 10‐bit digital control is implemented using 0.18 μm CMOS technology. A complementary to absolute temperature (CTAT) current bias is employed to achieve temperature compensation. Operating from a 1.8 V supply, the oscillator consumes the currents of 5.41 mA and 15.15 mA at 470 MHz and 990 MHz, respectively. Measurement results show that the frequency drift of the oscillator is within 1% from−10 to 80°C.
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