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This paper presents simulation models of filters with operational amplifiers that can be used in digital simulators. It describes the real number modeling used for analog functionally, presents a practical implementation of the most important analog “component” - the operational amplifier used in a 1st order low-pass filter, and compares the proposed filter models with the classical SPICE models of...
This paper presents the simulation of a variable gain amplifier from three perspectives: functional, using LTspice circuit simulator; signal-to-noise-ratio, computed with Excel and power consumption, estimated with ACEplorer power simulator. The architectural decisions are taken based on these simulations to meet the following requirements: a dynamic range greater than 60 dB, the frequency domain...
The paper presents the concept and the implementation of a hardware pseudorandom generator based on Salsa stream cipher and a unique identifier composed of PUF circuits. The pseudorandom generator is implemented on a hardware reconfigurable FPGA platform and it is designed to be used in FPGA security applications. Many of the real time complex applications designed on FPGA platforms need speed computations...
This paper describes the power modeling process based on measurements and the simplified power model of a complex chip. The analyzed MD8710 chip contains an ARM processor subsystem, an analog front-end, a Bluetooth with radio-frequency transceiver, a matrix display controller, digital connectivity and auxiliary peripherals. The dedicated board, the test-bench and the methods used for measurements...
This paper presents the simulation results and conclusions used to design a variable gain amplifier (VGA) for ultrasounds. It is defined the architecture and implementation of a VGA for a portable system with low power consumption and low noise for a frequency domain of 100 kHz to 4 MHz and a gain variation of 72 dB. The proposed circuit consists on a preamplifier, a switchable active filter and tree...
This paper presents some practical considerations for a residential heat pump system: the implementation of the ground loop, the power consumption during the 2010–2011 heating season, a comparison between a heat pump and a gas furnace heating system from the power point of view, the temperature monitoring subsystem and the ground temperature variations for one year period. The main goal of the paper...
This paper presents the results of the ground temperature monitoring with temperature sensor circuits based on LM35 for a heat pump system with underfloor heating. It is presented a procedure to estimate the ground loop of the heat pump, based on ground temperature measurements. The ground temperature monitoring results demonstrates the validity of the ground loop estimation. The ground temperature...
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