An optimized Direct Digital Frequency Synthesizer (DDFS) design in terms of reduced ROM, high throughput and speed is designed in this paper. DDFS is designed with 200 MHz reference clock frequency and 32 bit FTW for the generation of sine and cosine signal with 16 bit output frequency having frequency resolution of 0.0466 Hz and Phase resolution of 0.0055°. DDFS design is simulated using VHDL ...

The primary objective of this study was to obtain insights into the outcomes of people living with HIV who accessed services through HIV/AIDS sentinel hospital-based and ART service delivery in China. Post-hoc analyses of an open cohort from an observational database of 22 qualified HIV/AIDS sentinel hospital-based and two CDC-based drug delivery facilities (DDFs) in Guangdong Province was comp...

This paper presents high-speed low-power small-area accumulator designs to be used in DDFS systems. To reduce the Numerically Controlled Oscillator (NCO) design complexity and size, only the most significant bits of the accumulator drive the phase to amplitude mapping block. Those bits need to be updated on every sampling clock, while the least significant bits of the accumulator are not visibl...

In a recent paper [1], Awerbuch suggests a distributed depth-first-search (DDFS) algorithm that improves the time complexity of the previous DDFS algorithm of Cheung [2]. The communication cost of the algorithm of [I] is 41 E I messages and the time complexity is less than 41V 1, where E is the set of undirected links and V is the set of nodes of the communication network. This is compared to 2...

This paper presents a direct digital frequency synthesizer (DDFS) with a 16-bit accumulator, a fourth-order phase domain single-stage interpolator, and a 300-MS/s 12-bit current-steering DAC based on the Q2 Random Walk switching scheme. The interpolator is used to reduce the phase truncation error and the ROM size. The implemented fourth-order single-stage noise shaper reduces the effective pha...

This study developed and examined the validity of Japanese versions of the Daydream Frequency Scale (DDFS) and the Mind Wandering Questionnaire (MWQ), which measures propensity for spontaneous thoughts and mind wandering, respectively. In Study 1, we translated the items of the DDFS and the MWQ into Japanese and verified their validity. In Study 2, we confirmed the correlation of both scales wi...

This paper presents a hybrid COordinate Rotation DIgital Computer (CORDIC) algorithm for designs and implementations of the direct digital frequency synthesizer (DDFS). The proposed multiplier-less architecture with small ROM ( 4 16× -bit) and pipelined data path provides a spurious free dynamic range (SFDR) of more than 84.4 dBc. A SoC (System on Chip) has been designed by m . μ 18 0 1P6M CMOS...

A line of dopamine-deficient (DD) mice was generated to allow selective restoration of normal dopamine signaling to specific brain regions. These DD floxed stop (DDfs) mice have a nonfunctional Tyrosine hydroxylase (Th) gene because of insertion of a NeoR gene flanked by lox P sites targeted to the first intron of the Th gene. DDfs mice have trace brain dopamine content, severe hypoactivity, an...

Introduction. About 65% of large (>30 km) craters on Venus have associated radar-dark diffuse features (DDFs) [1], including well-expressed radar-dark parabolas [2]. DDFs were interpreted as surficial deposits of loose material lifted during crater formation [2, 3]. Craters with parabolas are thought to be the youngest [2]. The morphological sequence of the DDFs from parabolas to halos to faint...

[1] In order to assess the nature of crater-associated radar-dark diffuse features (DDFs) on Venus and to understand their formation and evolution, we analyzed Magellan radar roughness, emissivity, and reflectivity data in the vicinity of craters accompanied by these features. Following others, we assumed that DDFs are deposits (mantles) of ejected material emplaced during formation of the impa...