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Simulation of Reconfigurable FET Circuits Using Sentaurus TCAD Tool
Published in Ashish Raman, Deep Shekhar, Naveen Kumar, Sub-Micron Semiconductor Devices, 2022
Remya Jayachandran, Rama S. Komaragiri, K. J. Dhanaraj
An OTA buffer circuit capable of driving capacitive loads is used in LCD column drivers. Unity gain single OTA buffer circuit driving resistive load is analyzed in detail in Ref. [32]. A buffer amplifier is a circuit with high input resistance and low output resistance that enables maximum power transfer. CMOS buffer circuits capable of driving capacitive loads and resistive loads are available in the literature. We have implemented a simple unity gain buffer amplifier using an OTA to drive low-resistance load. The buffer amplifier design is demonstrated using an SG-RFET OTA in the Sentaurus TCAD tool. The detailed study of the OTA buffer amplifier using MOSFET is presented in Ref. [32]. The gain variation depicts the low-resistance load driving capability of the SG-RFET unity gain buffer amplifier similar to the MOSFET OTA buffer amplifier. The gain is reduced as in the conventional unity gain buffer circuit with a decrease in load.
Computer Interface and Instrumentation Electronics
Published in Felix Alberto Farret, Marcelo Godoy Simões, Danilo Iglesias Brandão, Electronic Instrumentation for Distributed Generation and Power Processes, 2017
Felix Alberto Farret, Marcelo Godoy Simões, Danilo Iglesias Brandão
A direct application of the noninverting amplifier of Figure 1.13 is the buffer, i.e., a circuit that provides a high impedance at the input, but capable of driving a higher current, i.e., a low impedance at the output. The circuit is shown in Figure 1.14, consisting of an open circuit to the ground at the inverting input (Z = ∞) and a short circuit between the amplifier output terminal and the inverting input (Zf = 0) [19,20]. The output signal vo of this amplifier is the exact duplication of the input signal vi, but then the load current is fed by the amplifier voltage supply from the amp-op output. In this way, the amplifier can be used to reproduce the input signal without loading the previous stage (this is the reason this circuit is called buffer), because the load becomes an infinite impedance for the amplifier input and a zero output impedance for the buffer amplifier.
Recording and reproduction
Published in Michael Talbot-Smith, Audio Engineer's Reference Book, 2013
Andy Wilson, Kenneth Gundry, Jan Arts, Jan Maes, Douglas Ford, Peter Skirrow
Figure 3.46 VHS hi-fi noise-reduction decoder. Ei, deemphasis, 240 + 56 \j.s; E2, de-emphasis, 56 ps; W, weighting, 240 + 24 ps. Det., peak rectification and smoothing; G?, buffer amplifier; VCA, voltage-controlled amplifier.
High-performance reconfigurable FET for a simple variable gain buffer amplifier design
Published in International Journal of Electronics, 2022
Remya Jayachandran, Rama S Komaragiri, Subramaniam P C, Ranjith R
Buffer amplifier circuits using operational amplifiers are commonly used as buffer circuits in analog signal processing applications for driving low resistive loads. Unity gain buffer amplifier using an operational transconductance amplifier (OTA) is the most fundamental driving scheme used in LCD column drivers to drive large capacitive loads (Sawigun et al., 2012). Biomedical, video and telecommunication applications require a buffer amplifier capable of driving low resistive loads preferably with a variable gain. DC coupling, required to drive low resistive loads, typically below 100 , complicates the buffer design. While driving a low-resistive load, a trade-off between voltage gain, output swing, and power sets the performance limits on the existing buffer circuit designs. In this paper, we proposed a simple configuration of a variable gain buffer amplifier, demonstrated for the first time, using SG-RFET based OTA. The proposed circuit’s gain can be varied without changing any circuit parameters, thus making the configuration more flexible compared to the existing buffer amplifier designs.