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Toshiba Develops Compact MOS-Varactor Simulation Model for Development of CMOS Millimeter Wave Circuits

Toshiba Corporation (TOKYO: 6502) today announced the development of a compact MOS-Varactor1 simulation model that delivers high level accuracy from DC to the millimeter wave (60 GHz) region. The new model was developed in cooperation with Professor Nobuyuki Itoh of Okayama Prefectural University.

The new compact MOS-Varctor model introduces an original algorithm to express scaling effects and can capture the impacts of parasitic effects that dominate in the 60 GHz region. Measurement parameters from 1MHz to 60 GHz for samples with different cell sizes were used for modeling. In general, it is difficult to express MOS-Varactor with a single model, but this newly developed model fully succeeds.

The new model's accurate capture of parasitic effects supports realization of low power consumption in RF-CMOS products, and Toshiba will use it a basic technology for developing such chips, key devices of the company's Analog and Imaging IC Division. Building on the work done so far, Toshiba expects to secure accurate simulation of CMOS millimeter wave circuits in the future.

The new model has been verified with samples with cell lengths ranging from 0.26 um to 2.0 um formed with Toshiba's 65nm RF-CMOS technology. Very good accuracy for all cell sizes was achieved from DC to 67 GHz.

Verification of this model was made on a 60GHz circuit. Phase noise level dependency on the control voltage of the 60 GHz VCO was measured and compared with a circuit simulation, with this model used in the frequency tuning block. Measurement accuracy was found to be 8 dB better than with the conventional model2.

These development results were presented at APMC, the Asia-Pacific Microwave Conference, held in Taiwan from December 4 to 7.

1. MOS (Metal oxide Semiconductor)-Varactor is a planar device, conventionally fabricated in CMOS technology. Generally, it is widely used in the frequency tuning block of the CMOS VCO (Voltage Controlled Oscillator) circuits.

2. BSIM (Berkeley Short-channel IGFET Model) is the conventional model generally utilized in simulating MOS-Varactor. It was developed by the University of California, Berkeley.

About Toshiba

Toshiba is a world-leading diversified manufacturer, solutions provider and marketer of advanced electronic and electrical products and systems. Toshiba Group brings innovation and imagination to a wide range of businesses: digital products, including LCD TVs, notebook PCs, retail solutions and MFPs; electronic devices, including semiconductors, storage products and materials; industrial and social infrastructure systems, including power generation systems, smart community solutions, medical systems and escalators & elevators; and home appliances.
Toshiba was founded in 1875, and today operates a global network of more than 550 consolidated companies, with 202,000 employees worldwide and annual sales surpassing 6.1 trillion yen (US$74 billion). Visit Toshiba's web site at

Information in the document, including product prices and specifications, content of services and contact information, is current on the date of the press announcement, but is subject to change without prior notice.

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