| A 900 MHz VCO Having 7-dB Phase Noise Improvement at 100 kHz Offset |
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Ja-Yol Lee1, Jin-Young Kang1, Seung-Hyeub Oh2 |
1SiGe Device Team, ETRI
2Dept. of Electronics Engineering, Chungnam National University |
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| Abstract |
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In this paper, the phase noise of 900 MHz VCO is improved using modified strip line square ring resonator. In order to demonstrate the phase noise improvement of the proposed VCO, the same circuit was manufactured using shorted-circuit resonator. In condition of the same bias current, the phase noise of the proposed VCO with modified square ring resonator is suppressed by 7 dB as - 103 dBc/Hz at 100 kHz offset compared to the conventional VCO with short-circuit resonator. From the proposed VCO, we achieved output power of - 4.8 dBm, harmonics suppression of 16 dB, and tuning bandwidth of 100 MHz. The proposed VCO consumed 5 mA at 3 V, and its size is 1.2 cm ${times}$ 1.0 cm. |
| Key words:
MSRR, SCR, Resonator, VCO, Phase Noise, Oscillator, Oscillation, Frequency, 900 MHz, Q-Factor |
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