1,721,098 research outputs found
Very low thermal drift precision virtual voltage reference
Get PDFA digital-based, process-supply-and-temperature independent voltage reference suitable to nanoscale CMOS technologies, which exploits the recently proposed ‘virtual reference' concept to achieve a very low thermal drift, is presented. Its performance is assessed on the basis of simulations and experiments carried out on a microcontroller-based, proof-of-concept prototype and is compared with state-of-the-art integrated analogue and digital voltage references. A simulated (measured) thermal drift as low as 1 ppm/°C (5 ppm/°C) in the temperature range −40/+140°C (−10/+100°C) is reported
Reproduction of the effects of an arbitrary radiated field by Ground Current Injection
No full textThe possibility of reproducing the effects on an electronic equipment of an arbitrary electromagnetic field excitation for effective electromagnetic interference susceptibility assessment is explored in this paper. To this purpose, a method to recreate the effects of a given electromagnetic field over an equipment under test by proper RF current injection on its reference conductor is derived from electromagnetic theory. The effectiveness and the practical feasibility of this approach is discussed on the basis of full wave electromagnetic simulations and experimental result
A Digital-Based Analog Differential Circuit
No full textA novel, digital-in-concept approach in the design of analog differential circuits, suitable to very low voltage, aggressively scaled, pure digital integrated circuit technologies, is explored in this paper. A differential stage based on the proposed technique is presented and its operation as a voltage comparator and as an operational amplifier in negative feedback configurations is discussed and demonstrated on the basis of theory and simulations. The practical feasibility of the proposed approach is finally verified by experiments carried out on a proof-of-concept prototyp
Acquisition front-end immune to EMI
No full textA new method to achieve immunity to EMI in a front-end for baseband analogue signal acquisition, avoiding the adverse effects of electromagnetic interference on operational amplifier-based conditioning amplifiers, is proposed. Unlike previous solutions, the presented novel system-level approach is based on standard hardware and does not require microelectronic optimisation. The validity of the proposed technique has been verified by computer simulation
Operational amplifier immune to EMI with no baseband performance degradation
No full textAn operational amplifier (opamp) input stage achieving a high degree of immunity against electromagnetic interference (EMI) is presented. Unlike previously proposed topologies, the novel circuit does not show any significant penalty in baseband operation. The effectiveness of the proposed solution and its robustness to mismatch and process variations is tested by simulations performed with reference to the AMS C35 0.35 ¿m CMOS technolog
All-Digital High Resolution D/A Conversion by Dyadic Digital Pulse Modulation
Get PDFIn this paper, the limitations of digital-to-analog (D/A) conversion by Digital Pulse Width Modulation (DPWM) are addressed and the novel Dyadic Digital Pulse Modulation (DDPM) technique for all-digital, low cost, high resolution, Nyquist-rate D/A conversion is proposed. Thanks to the spectral characteristics of the new modulation, in particular, the requirements of the filter needed to extract the baseband component of DPWM signals can be significantly released so that to be suitable to inexpensive integration on silicon in analog interfaces for nanoscale integrated systems. After the new DDPM technique and its properties are introduced on a theoretical basis, the implementation of a D/A converter (DAC) based on the proposed modulation is addressed and its performance in terms of noise and linearity is discussed. A 16-bit DDPM-DAC prototype is finally synthesized on a field-programmable gate array (FPGA) and experimentally characterized
A Digital-Based Virtual Voltage Reference
Get PDFA novel virtual reference concept is introduced in this paper to design accurate, mostly digital, software-defined, process-supply-and-temperature (PVT)-independent voltage references suitable to replace conventional analog reference circuits in present day, low voltage, aggressively scaled, mainly digital integrated systems. The operation and the performance of references based on the proposed approach are tested by computer simulations and experiments carried out on a proof-of-concept, microcontroller-based prototype, reporting a measured thermal drift of 16ppm/°C in a range from -10°C to 100°C and a line regulation of 0.15%/V. The advantages in terms of costs and performance of the proposed digital references in comparison with state-of-the-art analog solutions are finally discussed
RFI-Induced Distortion in Switched-Capacitor Circuits
Get PDFThe errors which are induced by radio-frequency interference (RFI) in switched-capacitor (SC) circuits are discussed and the main role played by the distortion of MOS switches in the on-state is highlighted. Furthermore, a new simple analytical model, which enables one to predict RFI-induced errors in SC circuits is proposed and it is validated by the comparison of its predictions with time-domain computer simulation result
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