Abstract
Quantum sensing applications such as nitrogen vacancy based magnetometry require phase locked loops (PLL), which can synthesize microwave frequencies in a narrow band near 2.87 GHz. Moreover, it is also required that the PLLs should have low noise and low jitter for high stability and fast settling time. These requirements seek low phase noise voltage controlled oscillator (VCO) with small variation in its gain (K <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">VCO</inf> ) within the desired tuning range. In this paper, we present a technique for designing a low phase noise VCO with low K <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">VCO</inf> and small K <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">VCO</inf> variation. To validate the proposed technique, an LC VCO has been designed and implemented in 0.18 $\mu \mathrm{m}$ CMOS process and post layout simulation results are presented. The simulation results show that the proposed LC VCO achieves K <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">VCO</inf> variation of ±3.82% in the frequency range of 2.75 - 2.94 GHz and exhibits a phase noise of −118.64 dBc/Hz at an offset of 1 MHz, while consuming 9 mW of power from a 1.8 V supply.
Published Version
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