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The article suggests a new method of the errors evaluation from the several common-mode signals in the differential difference operational amplifiers (DDAs), based on the theory of autonomous multiport circuit. These errors of DDA in its main connection circuits can be described by feeding a special current autonomous parameter to the classical equivalent circuit of DDA. This parameter is connected...
We present the design and analysis of a power-efficient cascode-compensated amplifier. The proposed analysis is based on an intuitive approach that simplifies the design of sucn structures. Based on this analysis, an amplifier in UMC 0.18 µm technology is designed. Cascode compensation, along with other power saving techniques, results in a power efficient amplifier with a relatively high figure of...
An ultra low voltage rail-to-rail DTMOS voltage follower is presented. The circuit is developed based on a complementary source follower with a common-source output stage. The circuit is designed using a 0.13 μm CMOS technology and SPICE is used to verify the circuit performance. The voltage follower can drive ± 0.25 V to the 500 Ω with the total harmonic distortion (THD) of 0.4% at the operating...
In this paper we propose current-mode echo cancellation technique for full-duplex chip-to-chip data communication. A new hybrid circuit topology suitable for current-mode echo cancellation is presented. The hybrid circuit topology is shared integration of an operational transconductance amplifier(OTA) and a transimpedance amplifier(TIA). The output/back-port impedance of the hybrid is matched with...
The paper presents a new solution to achieve rail-to-rail common mode input voltage swing for CMOS operational amplifiers. The common mode input range of a MOS differential stage is limited by the threshold voltage of the input transistors. With a pair of complementary input stages the whole range from GND to VDD can be covered. Their drain currents are summed up but the resulting current as well...
The paper presents a wideband fully differential operational amplifier in 0.35μm SiGe technology. The circuit provides a gain of 94dB and a 1.6GHz unity gain bandwidth drawing 25 mA from 3.3V supply voltage. The circuit employs a novel class AB output stage and it was used to generate wideband low impedance voltage references for a high speed A/D converter.
The cases of band-width extension in metal-oxide semiconductor (MOS) transistor driving-point and trans-impedance stages are considered. Optimization of the band-width with transistor sizing, biasing, and inductive shunt peaking are addressed. A numerical plus graphical technique is suggested for a first-hand estimation of the peaking inductor. Simulation results are presented to validate the theoretical...
We present a compact current mode stimulator for utilization in neural stimulation arrays. The stimulator is implemented in a 0.35μm CMOS technology and occupies an area of 50μm×400μm. The memory in every current driver allows for simultaneous stimulation on multiple active channels when used as part of an array of stimulators. Circuit reuse in the stimulator and utilization of a single DAC yield...
As CMOS technology continues to evolve, the supply voltages are decreasing while at the same time the transistor threshold voltages are remaining relatively constant. Making matters worse, the inherent gain available from the nano-CMOS transistors is dropping. Traditional techniques for achieving high-gain by vertically stacking (i.e. cascoding) transistors becomes less useful in nano-scale CMOS processes...
With the advent of miniaturised sensors for various engineering and medical applications there is an increased demand of low-power, low-voltage analog building blocks like opamps and OTAs. Degradation of certain amplifier characteristics with supply voltage is a major concern for low-voltage design and often poses contradictory requirement. CMRR (common mode rejection ratio), one such feature, is...
A new Current Feedback Amplifier (CFA) suitable for VLSI applications is presented in two different designs to serve both low power (LBW design) and high bandwidth (HBW) applications. The new circuit is employing positive current conveyor followed by amplifier followed by buffer to achieve very high trans-impedance for this CFA circuit without needing to stack many transistors together and at the...
A low noise amplifier for UWB and broadband applications is presented. The active dual loop negative feedback architecture dissevers the severe tradeoff existing between the input impedance, gain and noise figure, and produces a flat S11 across the entire band. The LNA is composed of a voltage amplifying negative feedback amplifier with a transconductance amplifier forming a shunt-shunt feedback around...
CMOS pseudo differential operational transconductance amplifier (OTA) has been proposed in this study. It can operate with significantly low supply voltage and provides respectable high output impedance. Besides, it enhances the common mode rejection ratio (CMRR) by using a special common mode feed forward (CMFF) technology. The chip has been manufactured in a 0.35 ??m-CMOS technology. The simulation...
This paper presents an analysis of the of self-heating on the key performance parameters of the high speed current feedback operational amplifiers (CFOA) designed using SOI bipolar transistors. The analysis shows that the frequency response of the open-loop transimpedance and common-mode rejection ratio (CMRR) of the CFOA is highly affected by the dynamic self-heating induced errors. A large- signal...
This paper presents a CMOS fully differential current feedback operational amplifier with controllable 3-dB bandwidth. The FDCFOA has the advantage of a wide range controllable 3-dB bandwidth (~57 MHz to 500 MHz) without changing the feedback resistance. The FDCFOA has a standby current of 320 ??A. PSpice simulations of the FDCFOA block were given using 0.25 ??m CMOS technology from AMI MOSIS and...
Active buffer electrodes are known to improve the immunity of bioelectric recordings against power line interferences. A survey of published work reveals that buffer electrodes are almost exclusively designed using operational amplifiers (opamps). In this paper, we discuss the advantage of utilizing a single transistor instead. This allows for a simple electrode, which is small and requires only two...
A Low Voltage Operational Amplifier based on new design principles is presented. The total standby power amounts to less than 300 ??W with a 1.1 V supply voltage. The circuit incorporates a unity-gain frequency of 1.5 MHz and a low-frequency gain of 67 dB. This functional unit occupies an area of 0.8 mm2 and can be fabricated with any Standard Bipolar Process.
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