superior isolation performance of the mixers is attributed to the precise control of the length for each stub in the circuit, as well as the APDP's antisymmetric characteristic of mixing a more stable quarter frequency of the fundamental signal.
CONCLUSIONA high-performance V-band quadruple subharmonic MIMIC mixer circuit has been proposed and demonstrated in this work for millimeter-wave down-converter applications. The proposed subharmonic mixers show good conversion-gain and isolation characteristics. The fabricated circuits operate in an RF frequency range of 58. 4 -62.4 GHz at an IF frequency of 2.4 GHz, and in an LO frequency range of 14 -15 GHz. An excellent conversion gain of 0.8 dB is obtained at an LO frequency of 14.5 GHz and an LO power of 12 dBm. Regarding the operation frequency range of the mixers, both LO-to-RF and LO-to-IF isolations are higher than 50 dB.
BEHAVIORAL MODEL OF A NOISY VCO FOR EFFICIENT TIME-DOMAIN SIMULATION
Phase noise models that describe the near-carrier spectrum in an accurate but insightful way are needed, to better optimize the oscillator design. In this paper we present a model to describe the effect of flicker noise sources on the phase noise of an oscillator, that can be applied both to linear oscillators and to nonlinear structures like relaxation and ring oscillators, so extending previous works that considered only the effect of flicker noise superimposed to the control voltage of a VCO. We separate the effect of high-frequency noise sources, that are known to provide a Lorentzian-shaped phase noise spectrum, from flicker noise. The latter causes a change in the circuit bias point, that can be mapped in a shift in the oscillation frequency by exploiting Barkhausen criterion (for linear oscillators) or by CAD simulations. The overall oscillator spectrum can be obtained as a convolution of the Lorentzian spectrum due to white noise with the probability density function of frequency fluctuations due to flicker noise sources
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