Signal Integrity Design Methodology for Package in Co-packaged Optics Based on Figure of Merit as Channel Operating Margin

RF System-in-Package (SiP) has become a viable packaging platform, which offers great flexibility to integrate ICs with different processes and different architects. With operating frequency becoming higher and multiple available technologies embedded in one package, the system could fail due to the undesired noise coupling resulted from the close proximity of the components. Therefore, the design methodology with signal integrity (SI), power integrity (PI), and electromagnetic compatibility (EMC) analysis becomes essential to tackle the SiP integration issues. The paper presents a RF SiP design methodology with SI/PI/EMC simulations, which greatly reduces the design time and enables first-pass success.

Download Full-text

Integrated Lab-on-a-Chip Optical Biosensor Using Ultrathin Silicon Waveguide SOI MMI Device

Sensors ◽

10.3390/s20174955 ◽

2020 ◽

Vol 20 (17) ◽

pp. 4955

Author(s):

Mohamed Y. Elsayed ◽

Sherif M. Sherif ◽

Amina S. Aljaber ◽

Mohamed A. Swillam

Keyword(s):

Design Methodology ◽

Figure Of Merit ◽

Optical Biosensor ◽

Glucose Sensing ◽

Multimode Interference ◽

Silicon Waveguide ◽

Definition Of ◽

Ultrathin Soi ◽

Compact Design ◽

Difference Time

Waveguides with sub-100 nm thickness offer a promising platform for sensors. We designed and analyzed multimode interference (MMI) devices using these ultrathin platforms for use as biosensors. To verify our design methodology, we compared the measured and simulated spectra of fabricated 220-nm-thick MMI devices. Designs of the MMI biosensors based on the sub-100 nm platforms have been optimized using finite difference time domain simulations. At a length of 4 mm, the 50-nm-thick MMI sensor provides a sensitivity of roughly 420 nm/RIU and with a figure of merit (FOM) definition of sensitivity/full-width-at-half-maximum, the FOM is 133. On the other hand, using a thickness of 70 nm results in a more compact design—only 2.4 mm length was required to achieve a similar FOM, 134, with a sensitivity of 330 nm/RIU. The limits of detection (LOD) were calculated to be 7.1 × 10−6 RIU and 8.6 × 10−6 RIU for the 50 nm and the 70-nm-thick sensor, respectively. The LOD for glucose sensing was calculated to be less than 10 mg dL−1 making it useful for detecting glucose in the diabetic range. The biosensor is also predicted to be able to detect layers of protein, such as biotin-streptavidin as thin as 1 nm. The ultrathin SOI waveguide platform is promising in biosensing applications using this simple MMI structure.

Download Full-text

A low-PDAP and high-PSNR approximate 4:2 compressor cell in CNFET technology

Circuit World ◽

10.1108/cw-01-2019-0009 ◽

2019 ◽

Vol 45 (3) ◽

pp. 156-168 ◽

Cited By ~ 2

Author(s):

Yavar Safaei Mehrabani ◽

Mehdi Bagherizadeh ◽

Mohammad Hossein Shafiabadi ◽

Abolghasem Ghasempour

Keyword(s):

Image Processing ◽

Design Methodology ◽

Figure Of Merit ◽

Signal To Noise Ratio ◽

Monte Carlo Analysis ◽

The Other ◽

Threshold Logic ◽

Signal To Noise ◽

Content Type ◽

Power Delay Product

Purpose This paper aims to present an inexact 4:2 compressor cell using carbon nanotube filed effect transistors (CNFETs). Design/methodology/approach To design this cell, the capacitive threshold logic (CTL) has been used. Findings To evaluate the proposed cell, comprehensive simulations are carried out at two levels of the circuit and image processing. At the circuit level, the HSPICE software has been used and the power consumption, delay, and power-delay product are calculated. Also, the power-delaytransistor count product (PDAP) is used to make a compromise between all metrics. On the other hand, the Monte Carlo analysis has been used to scrutinize the robustness of the proposed cell against the variations in the manufacturing process. The results of simulations at this level of abstraction indicate the superiority of the proposed cell to other circuits. At the application level, the MATLAB software is also used to evaluate the peak signal-to-noise ratio (PSNR) figure of merit. At this level, the two primary images are multiplied by a multiplier circuit consisting of 4:2 compressors. The results of this simulation also show the superiority of the proposed cell to others. Originality/value This cell significantly reduces the number of transistors and only consists of NOT gates.

Download Full-text