| Citation: |
Guo Shita, Huang Lu, Yuan Haiquan, Feng Lisong, Liu Zhiming. A 4 GHz quadrature output fractional-N frequency synthesizer for an IR-UWB transceiver[J]. Journal of Semiconductors, 2010, 31(3): 035002. doi: 10.1088/1674-4926/31/3/035002
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Guo S T, Huang L, Yuan H Q, Feng L S, Liu Z M. A 4 GHz quadrature output fractional-N frequency synthesizer for an IR-UWB transceiver[J]. J. Semicond., 2010, 31(3): 035002. doi: 10.1088/1674-4926/31/3/035002.
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A 4 GHz quadrature output fractional-N frequency synthesizer for an IR-UWB transceiver
DOI: 10.1088/1674-4926/31/3/035002
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Abstract
This paper describes a 4 GHz fractional-N frequency synthesizer for a 3.1 to 5 GHz IR-UWB transceiver. Designed in a 0.18 μm mixed-signal & RF 1P6M CMOS process, the operating range of the synthesizer is 3.74 to 4.44 GHz. By using an 18-bit third-order Σ–Δ modulator, the synthesizer achieves a frequency resolution of 15 Hz when the reference frequency is 20 MHz. The measured amplitude mismatch and phase error between I and Q signals are less than 0.1 dB and 0.8° respectively. The measured phase noise is –116 dBc/Hz at 3 MHz offset for a 4 GHz output. Measured spurious tones are lower than –60 dBc. The settling time is within 80 μs. The core circuit conupSigmaes only 38.2 mW from a 1.8 V power supply. -
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