This article presents a color light detection system integrated in 130 nm CMOS technology. The sensors and corresponding electronics detect light in a CIE XYZ color luminosity space using on-chip integrated sensors without any additional process steps, high-resolution analog-to-digital converter, and dedicated DSP algorithm. The sensor consists of a set of laterally arranged integrated photodiodes that are partly covered by metal, where color separation between the photodiodes is achieved by lateral carrier diffusion together with wavelength-dependent absorption. The sensor system detects the color light parameters with 22-bit accuracy, consumes less than 60 μA on average at 10 readings per second, and occupies approx. 0.8 mm2 of silicon area (including three photodiodes and the analog part of the ADC). The DSP is currently implemented on FPGA.
COBISS.SI-ID: 11077972
In this article a new concept with current tracking during the PWM “ON” phase is presented, focusing on the current measuring principle. The track record, called coil “signature,” provides data for smart current driving, which is also described in the paper together with simulation results, main layout considerations, and some measurements.
COBISS.SI-ID: 10915924
In this paper, it is demonstrated that capacitors can be manufactured with single-printed dielectric layers if the layer is completely polymerized. It is shown that electrical shorts are related to the state of polymerization in a defect-free dielectric layer. To demonstrate this, the electrical functionality of capacitors with single-printed dielectric layers was studied in terms of intrinsic properties of the ultraviolet (UV) curable dielectric layer, which were varied according to the curing energy. The chemical structure of the cured layer was analyzed with infrared spectroscopy to obtain the appearance of polymerizable groups and crosslinks within the polymer structure. Differential scanning calorimetry was used to measure the glass transition temperature of the dielectric material. It increases rapidly with UV curing until the polymerization is completed, whereas a small increase with further curing confirms crosslinking of the polymer. The influence of structuring effects within a dielectric layer in the presence of electrical shorts between electrodes is discussed. This research confirms that a completely polymerized layer forms a barrier to leakage and helps to prevent the formation of conductive paths between electrodes. Therefore, a connection between the structure of polymerized layer and its electrical properties is highly reasonable.
COBISS.SI-ID: 5689370
This article presents the design of a miniature detection system and its associated signal processing electronics, which can detect and selectively recognize vapor traces of different explosives in the air. It is based on the array of surface-functionalized COMB capacitive sensors and extremely low noise, analog, integrated electronic circuit, hard-wired digital signal processing hardware and additional software running on a PC. The instrument is sensitive and selective, consumes a minimum amount of energy, is very small (few mm3), and is insensitive to mechanical influences. Using an electronic detection system built of low noise analog front-end and hard-wired digital signal processing, it is possible to detect less than 3 TNT molecules in 1012 molecules of the air at 25oC on a 1 Hz bandwidth using 10 mA current from a 5V supply voltage.
COBISS.SI-ID: 11045716
This paper presents digital signal processing for a miniature, multi-channel, multi-sensor detection system, based on chemically functionalized micro-capacitors and low noise integrated analog electronics and appropriate digital signal processing. For such multi-channel measurements with extreme requirements regarding sensitivity, it is necessary to have the appropriate analog signal processing electronics, as well as digital signal processing hardware, algorithms, and software, which is described in the article. The complete architecture of the DSP part of a multi-channel sensor measurement system is explained, together with some simulation and the measured results.
COBISS.SI-ID: 11237460