Millimeter-wave CMOS circuit design

3-D CMOS Circuits Based on Low-Loss Vertical Interconnects on Parylene-N

“…In this study, we have used a thick (15 m) parylene-N layer with a frequency-independent dielectric constant of 2.35-2.4, and a very low loss tangent of 6 10 up to 60 GHz that deposits in a conformal fashion using a simple process at room temperature. 2 The main drawback of parylene-N is its large thermal mismatch to Si (thermal expansion coefficient of 69 ppm/ C versus 3.2 ppm/ C for Si), which complicates its application for large area circuits under high operating temperature such as high-power electronics.…”

“…Leaving Port 3 open makes an open stub, and hence, presents frequency-dependent impedance at the junction. For a loss-less transmission line, the impedance measured at distance mm away from the open circuit is given by the following equation: (2) where is the characteristic impedance of the line represents the speed of light, and is the relative dielectric constant of the substrate. Fig.…”

A 54-GHz push-push VCO with wide tuning range in 0.18-μm CMOS technology

“…Fair comparisons between the measured performances of our proposed VCO and those V-band VCOs previously reported in 0.18-lm CMOS technology [4][5][6] are summarized in Table 1. When compared with the near 50-GHz VCOs [4][5][6], which use the typical tuning methodology by tuning varactors only, the proposed VCO is much impressive with a wider tuning range and sufficiently low phase noise by using the proposed low-inductance high-Q inductor. Therefore, a greater tuning range can be achieved by using a larger varactor capacitance.…”

“…As the CMOS technology progresses, many MMW VCOs [4][5][6][7][8][9] have been successfully demonstrated. Although the crosscoupled LC-tank topology is widely used for VCO designs, the maximum operation frequency of the oscillation circuit is limited by the f max of the transistors.…”

A Ka‐band CMOS power amplifier using new substrate‐shielded coplanar waveguide

“…Therefore, in antenna design, various configurations have been presented to enhance operating bandwidths, such as using sleeve shaped [1,2] or wide-slot [3][4][5]. Among these designs, the slot …”