Progress in Systems and Telecommunication Engineering

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Progress in Systems and Telecommunication Engineering

Models for Digital Program Amplifiers

Marieta Kovacheva and Ivailo Pandiev
Faculty of Electronics TU-Sofia Kl. Ohridski 8 1000 Sofia, Bulgaria

Abstract: We in this work have introduced models for digital program amplifiers. We have used the operational amplifiers to simplify the techniques. The proposition ensures the input impedance, transfer function (amplifier gain in binary steps versus controlling digital code through SPI), small-signal frequency response, large-signal pulse response, output characteristic (voltage and current limitations) and output resistance. Using microchip, we have extracted the measures with one and two channels PGA. With the help of the structure and operation principles we have developed the circuits. The pGA based model have used the format of the simulation program system of the Mentor Graphics. The testing outcome confirm with the theoretical propositions.

Keywords: Mixed-signal Circuits, Programmable Gain Amplifiers, SPI, Behavioural Models, VHDL-AMS, Mixed-signal Simulation Models for Digital Program Amplifiers

DOI:

Full_Text PDF 1.31 MB Download: 114 times

References:

[1] PSpice A/D library list, Release 9.2, Cadence Design Systems, 2000.
[2] System Vision mixed-signal model library (ver. 5.5), Mentor Graphics, 2007
[3] Martev, D., Panayotov, I., Pandiev, I. (2010). Behavioural VHDL-AMS Model for Monolithic Programmable Gain Amplifiers, ICEST vol. 2, pp. 835-838, 2010.
[4] Pandiev, I., Yakimov, P., Todorov,T. (2009). Macromodeling of programmable gain amplifiers”. E+E, No 7-8, pp. 69-76, 2009.
[5] Single-Ended, Rail-to-Rail I/O, Low Gain PGA, MCP6S21/2/6/8 - Datasheet, Microchip Technology Inc., 2003.
[6] Christen, E., Bakalar, K. (1999). "VHDL-AMS - A hardware description language for analog and mixed-signal applications, IEEE Trans. on cir. and syst. - 2, volume 46 (10), 1263-1272.
[7] Definition of analog and mixed signal extensions to IEEE standard VHDL, IEEE Standard 1076.1, 1999.

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