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A Digitally Controlled Oscillator With Wide Frequency Range and Low Supply Sensitivity

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5 Author(s)
Seong-Young Seo ; School of Information and Communication Engineering, Sungkyunkwan University, Suwon, Korea ; Jung-Hoon Chun ; Young-Hyun Jun ; Seok Kim
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This brief presents a wide frequency range digitally controlled oscillator (DCO) with low supply sensitivity and low power consumption. We propose a compensation scheme employing feedforward inverters to suppress supply noise. Both wide frequency range and fine resolution are obtained using a hierarchical architecture consisting of a coarse delay chain and an interpolator. The proposed DCO was fabricated in a 0.13-μm CMOS process. It successfully eliminates noise components due to supply variation. The phase noise at 1-MHz frequency offset from the carrier frequency of 700 MHz is -106.3 dBc/Hz. The frequency range of the DCO is measured from 320 MHz to 1.25 GHz.

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IEEE Transactions on Circuits and Systems II: Express Briefs  (Volume:58 ,  Issue: 10 )