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U-band Fractional-N PLL Frequency Synthesizer

Jie Chen

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Abstract

A U-band fractional-N PLL frequency synthesizer is integrated in 0.18 μm 1.8 V CMOS process,except for tuned inductor and loop filter. A LC tank voltage-controlled oscillator (VCO) with switched capacitors array (SCA) is used to achieve wide-band frequency range. The MASH Δ-Σ modulating technology is used to shape and degrade in-band phase noise. The measurements results show that the frequency range of frequency synthesizer is 650～920 MHz and the phase noise is-82 dBc/Hz@100 kHz and-121 dBc/Hz@1 MHz The frequency resolution can achieve 15 Hz; And the frequency synthesizer consumes 22 mW from a 1.8 V supply voltage.

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What this paper is about

A U-band fractional-N PLL frequency synthesizer is integrated in 0.18 μm 1.8 V CMOS process,except for tuned inductor and loop filter. A LC tank voltage-controlled oscillator (VCO) with switched capacitors array (SCA) is used to achieve wide-band frequency range. The MASH Δ-Σ modulating technology is used to shape and degrade in-band phase noise. The measurements results show that the frequency range of frequency synthesizer is 650～920 MHz and the phase noise is-82 dBc/Hz@100 kHz and-121 dBc/Hz@1 MHz The frequency resolution can achieve 15 Hz; And the frequency synthesizer consumes 22 mW from a 1.8 V supply voltage.

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Available abstract

A U-band fractional-N PLL frequency synthesizer is integrated in 0.18 μm 1.8 V CMOS process,except for tuned inductor and loop filter. A LC tank voltage-controlled oscillator (VCO) with switched capacitors array (SCA) is used to achieve wide-band frequency range. The MASH Δ-Σ modulating technology is used to shape and degrade in-band phase noise. The measurements results show that the frequency range of frequency synthesizer is 650～920 MHz and the phase noise is-82 dBc/Hz@100 kHz and-121 dBc/Hz@1 MHz The frequency resolution can achieve 15 Hz; And the frequency synthesizer consumes 22 mW from a 1.8 V supply voltage.

Key concepts: Frequency synthesizer, Phase noise, dBc, Voltage-controlled oscillator, Phase-locked loop, Direct digital synthesizer, Capacitor, PLL multibit

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