Low Power Folded Cascode OTA

Kundra, Swati

doi:10.5121/vlsic.2012.3111

Cited by 5 publications

(7 citation statements)

References 7 publications

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“…It has better high frequency PSRR. Due to extra current leg devices, input referred noise is increase and operates with high power consumption [7,24]. The noise efficiency factor (NEF) is improved by using source degeneration resistors.…”

Section: Operational Transconductance Amplifier (Ota) Used In Neural mentioning

confidence: 99%

“…There are many other implementations mentioned in literature for improving the performance of the design like current mirror OTA [10], fully differential self-biased OTA [11], current boosting method [12], self Cascoding method [7], current buffer compensation method [13], bulk driven OTA [14], input complementary folded cascode OTA [15], push-pull OTA [8], recycling folded cascode [16], floating gate OTA [21], current division method [20]. Current division and source degeneration comprises of two methods, source degeneration and current splitting.…”

Section: Operational Transconductance Amplifier (Ota) Used In Neural mentioning

confidence: 99%

“…Where rO is the drain-source resistance of transistor. Now combine (7) and 10 The slew rate (SR) as one of the design specifications is defined to quantify the change in voltage for particular time.…”

Section: = Gbw (8)mentioning

confidence: 99%

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A 76db 828nv/√Hz Low Noise Bio Signal OTA For Neural Signal Recording Applications

Mythry¹,

Moni²

2018

IJET

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The low frequency, low amplitude biomedical signals which created a tremendous demand amongst clinicians and neuroscience researchers are to be amplified in the range of millihertz to kilohertz by rejecting the dc offsets. This research article presents a Bio Signal OTA (Bio-OTA) with 76dB gain, 828nV/ 16Hz"> noise and 390nW power is designed in 90nm CMOS process and also a brief survey on the different types of OTAs used for neuro recording applications is discussed. The Wilson current mirror is used to design 1volt Bio-OTA. The Common mode rejection ratio (CMRR) is obtained as 75dB, power supply rejection ratio (PSRR) is above 88dB and gain bandwidth product (GBW) is 223MHz.

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Section: Operational Transconductance Amplifier (Ota) Used In Neural mentioning

confidence: 99%

Section: Operational Transconductance Amplifier (Ota) Used In Neural mentioning

confidence: 99%

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A 76db 828nv/√Hz Low Noise Bio Signal OTA For Neural Signal Recording Applications

Mythry¹,

Moni²

2018

IJET

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“…Folded Cascode OTA is better operational amplifier architecture. Firstly, OTA designer occupies small overhead and folded structure allows a low supply voltage to systems where is embedded [3], [4] and low current consumption. Secondly, the PMOS differential pair that converts the input voltage to current deals less noise compared with a NMOS differential pair [16].…”

Section: Basic Theorymentioning

confidence: 99%

“…The output voltage swing of Folded Cascode OTA structure is improves but it's one of the major drawbacks [10], [15]. Folded Cascode Gate Driven OTA [1], [3], [4] and Folded Cascode Bulk Driven OTA [17], [18], [20]. To improve the characteristics of classic Folded Casocde OTA a Folded Cascode Bulk Driven OTA is used; its input voltages are applied on the bulk of the transistors consisting the differential pair.…”

Section: Basic Theorymentioning

confidence: 99%

Improved PSRR and Output Voltage Swing Characteristics of Folded Cascode OTA

Toihria¹,

Tixier²

2014

IJEEE

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Mixed and analog systems design with high performance suffers from many difficulties due to supply voltage, power consumption and area overhead. A need for low-voltage low-power operational amplifiers exists and used for some applications. This paper deals an effective OTA design for good PSRR, low-voltage, low-power and wide output voltage swing operational amplifier. Trying to combine an alternative technique of voltage driven-Bulk CMOS with a folded cascade OTA design to improve PSRR and output voltage swing in that circuit by reducing its supply voltage and power consumption. Two principles input voltage for OTA are used and applied at the bulk of the differential pair, showing its advantages and disadvantages, discussing further problems that have to be solved for better performance. The presented Folded Cascode OTA designs; bulk driven and gate driven structure, are implemented using a 0.35μm CMOS technology and the supply voltage 2V. These two architectures have been compared, using cadence spectrum simulations, in this paper along with drawbacks and advantages of each. The obtained results showed the good performances of the Folded Cascode Bulk Driven OTA; this is compared with classic OTA design.  Index Terms-classic folded cascode OTA, folded cascode bulk driven OTA, PSRR, output voltage swing Intissar Toihria was born in Medenine, Tunisia in 1981. She is graduated from the UCBL1 in France. She is received her master degree in Electrical and Electronic Engineering from UCBL1 France in 2008.

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