Daquan Huang

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In the past decade, the best frequency synthesizers of millimeterwave communication systems were made from III-V (GaAs or InP) compound based HBTs because of high fT and fmax, low 1/f noise, low substrate loss, and high-Q on-chip transmission lines and passive components [1, 2]. More recently, SiGe HBTs were also used for VCOs due to their low 1/f noise and(More)
Terahertz image and spectroscopic systems (operating in frequency range from 300GHz to 3THz) have drawn increasing attention recently due to their unique capabilities in detecting and possibly analyzing concealed objects. The generation of terahertz signals is nonetheless nontrivial and traditionally accomplished by using either free-electron radiation,(More)
Deregulation of microRNAs (miRNAs) is implicated in tumor progression. We attempt to identify the tumor suppressive miRNA not only down-regulated in glioblastoma multiforme (GBM) but also potent to inhibit the oncogene EZH2, and then investigate the biological function and pathophysiologic role of the candidate miRNA in GBM. In this study, we show that(More)
Deregulation of microRNAs (miRs) contributes to tumorigenesis. Down-regulation of miR-340 is observed in multiple types of cancers. However, the biological function of miR-340 in glioblastoma multiforme (GBM) remains largely unknown. In the present study, we demonstrated that expression of miR-340 was downregulated in both glioma cell lines and tissues.(More)
Digital control of the effective dielectric constant of a differential mode transmission line is shown up to 60GHz in standard CMOS technology. The effective dielectric constant is shown to increase from 5 to over 50 for the fixed artificial dielectric case. The digital controlled artificial dielectric transmission line (DiCAD) uses MOS switches to(More)
A new injection-locked frequency divider (ILFD) circuit topology, by combining the strengths of LC type ILFD (LC_ILFD) and ring oscillator type ILFD (RO_ILFD), is proposed to achieve high speed, low power, wide locking range and accurate quadrature output phases. The frequency-division criterion is analyzed and agrees well with simulation results. The(More)
A compact 60GHz CMOS differential direct conversion receiver front-end based on eight-metal-layer interleaved onchip transformers is realized for low voltage (1.2V) and high gain (24dB) operation with input 1dB compression point of -11dBm, Noise Figure of 10.5dB and power consumption of 4.3mW/arm. Compared with prior arts in CMOS, this receiver achieves the(More)
This paper presents new circuit topologies and design techniques for low-phase-noise CMOS mmWave Quadrature VCO (QVCO) and VCOs. A transformer coupling with extra phase shift is proposed in QVCO to decouple the tradeoff between phase noise (PN) and phase error and improve the PN performance. This technique is demonstrated in a mmWave QVCO with a measured PN(More)
An innovative and manufacturable technology for three-dimensional substrate impedance engineering based on p<sup>-</sup>/p<sup>+</sup> Si substrates, which meets the stringent substrate requirement for high performance system-on-chip applications, is described. Electroless plating is used to fabricate Faraday cage for crosstalk isolation and true ground(More)