We have developed a 3-D high-resolution radar at 300 GHz with a cell resolution of 1× 1.6×
1.6 cm 3 at a standoff distance of 8 m for security applications. The selection of an operating …

Industry is facing increasingly tougher quality requirements for more complex ICs. To meet
these quality requirements we need to improve the defect coverage. This paper presents a …

An 800-MHz low-power direct digital frequency synthesizer (DDFS) with an on-chip digital-to-
analog (D/A) converter is presented. The DDFS consists of a phase accumulator, two phase …

This unique and comprehensive resource offers you a detailed treatment of the operations
principles, key parameters, and specific characteristics of active and passive RF, microwave …

This paper presents a survey of the latest techniques and hardware advances in sine output
direct digital synthesizers (DDSs). First, a brief description of the theory of sine output DDSs …

This paper presents new techniques to implement direct digital frequency synthesizers
(DDFSs) with optimized piecewise-polynomial approximation. DDFS performances with …

Submillimeter-wave imaging radars for standoff detection require broadband and fast-switch
signal-generation architectures in order to achieve a high-range-resolution and near-video …

A design technique that uses nonlinear digital-to-analog converter (DAC) for implementing
low-power direct digital frequency synthesizer (DDFS) is proposed. The nonlinear DAC is …

A photonics-based wideband distributed coherent aperture radar (DCAR) system is
proposed and experimentally demonstrated. In the proposed system, the central controlling …

The authors present a review of phase to sine amplitude conversion (PSAC) techniques for
direct digital frequency synthesis (DDFS). Principles of DDFS are first considered, then …