The bandgap voltage reference (BGR) circuit is an important component of Analog-to-Digital and Digital-toAnalog converters, which are broadly used in mixed-signal and radio-frequency systems. Most BGR use bipolar junction transistors (BJT) to easily reduce the temperature dependence, due to temperature coefficients, other common practice is the use of operational amplifiers (OP-AMP). The goal i...

A systematic approach has been employed to synthesize sinusoidal active-R oscillators using the current feedback op-amps. This approach is an extension to the method employed in [1] for the design of active-R oscillators using voltage op-amp. It is found that the active-R technique applied to current-feedback op-amps will be suitable for high frequency oscillator circuits with high output ampli...

In this paper a new high gain bandwidth (GBW) and low power folded cascade OPAMP is presented. It has been implemented and layouted by CADENCE software in 0.18μm. Its DC gain is 82db and its bandwidth is 200MHz. Power consumption is one of the main design challenges in very-lowvoltage high-speed analog integrated circuits. In this paper, different techniques to reduce the power consumption in l...

This low-power RD modulator targets the DVBH requirements and achieves about 10 bit with 6-MHz signal band. Suitable topological modifications enable the realization of a third order modulator with two op-amps. Moreover, a technique for swing reduction of the last op-amp strongly reduces the number of comparators in the quantizer. The power reduction techniques limit the consumption to 6.18 mW,...

In low voltage low power CMOS systems both the high input offset and noise voltages of MOSFETs and also the moderate gain of op amps limit the accuracy of analog circuits. In this paper we present a new high-accuracy instrumentation amplifier; this circuit topology is the first ever reported "non-autozero" instrumentation amplifier which allows to compensate, beside the input offset and noise v...

With one operational amplifier (op-amp) in negative feedback, the traditional zero potential circuit could access one element in the two-dimensional (2-D) resistive sensor array with the shared row-column fashion but it suffered from the crosstalk problem for the non-scanned elements' bypass currents, which were injected into array's non-scanned electrodes from zero potential. Firstly, for supp...

This paper presents the design of high gain and low power fully differential Operational Transconductance Amplifier(OTA). Both the main conventional OTA and the boosting amplifiers are fully differential folded cascode.To increase the open-loop gain of the main OTA two auxiliary operational amplifiers(op-amps) are used . These auxiliary op-amps are fully differential folded cascode op-amps with...

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 sub-100nm proc...

Cascode CMOS op-amps use a large number of external bias voltages. This results in numerous drawbacks, namely, an area and power overhead, susceptiblity of the bias lines to noise and cross-talk and high sensitivity of the bias point to process variations. In this paper we present a self-biasing technique for folded cascode CMOS op-amps that uses no additional devices and no baas voltages other...

The design of high-accuracy analogue circuits is becoming a difficult task with the scaling down of supply voltages and transistor channel lengths of the current mixed-signal integrated circuits. Most of this kind of circuits require the use of the highestperformance active cell: the operational amplifier (op amp). Designers are continuously working toward tradeoff solutions between gain, input...