Fig. 1.
.Theory illustration of injection locking. (a) Conceptual oscillator. (b) Frequency shift due to injection. (c) Vector diagram. (d) Reduction of phase noise due to injection locking.
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| Citation: |
Yalan Xu, Jinguang Jiang, Jianghua Liu. Wide band low phase noise QVCO based on superharmonic injection locking[J]. Journal of Semiconductors, 2016, 37(1): 015002. doi: 10.1088/1674-4926/37/1/015002
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Y L Xu, J G Jiang, J H Liu. Wide band low phase noise QVCO based on superharmonic injection locking[J]. J. Semicond., 2016, 37(1): 015002. doi: 10.1088/1674-4926/37/1/015002.
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Wide band low phase noise QVCO based on superharmonic injection locking
DOI: 10.1088/1674-4926/37/1/015002
More Information
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Abstract
A wide band, injection-coupled LC quadrature voltage control oscillator is presented. In the proposed circuit, two oscillators are injection locked by coupling their second-order harmonics in anti-phase, forcing the outputs of two oscillators into a quadrature phase state. As the common-mode point sampling the second harmonic frequency, flicker noise of the tail current is suppressed, the phase noise is reduced.The proposed design accomplishes a wide tuning frequency range by a combination of using a 5-bit switch capacitor array (SCA) for discrete tuning in addition to linearly varying AMOS varactors for continuous tuning. The proposed design has been fabricated and verified in a 0.18 μ m TSMC CMOS technology process. The measurement indicates that the quadrature voltage controlled oscillator has a 41.7% tuning range from 3.53 to 5.39 GHz. The measured phase noise is 127.98 dBc/Hz at 1 MHz offset at a 1.8 V supply voltage with a power consumption of 12 mW at a carrier frequency of 4.85 GHz.-
Keywords:
- QVCO,
- injection locking,
- switch capacitor array (SCA),
- phase noise,
- wideband
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References
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