A rail-to-rail, constant gain, buffered op-amp for real time video applications

Moldovan, Lucian; Li, H.H.

doi:10.1109/4.551908

Cited by 25 publications

(4 citation statements)

References 8 publications

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“…7 is the same as in Ref. [12] but giving a new operation principle. The control circuit consists of two seriesconnected transistors (MP6-MP5 and MN6-MN5) and two current mirrors (MP3-MP4 and MN3-MN4) as shown in grey area in Fig.…”

Section: Detailed Schematic Of the Rail To Rail Operational Amplifiermentioning

confidence: 99%

Design and analysis of a dual mode CMOS field programmable analog array

et al. 2014

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This paper presents a novel field-programmable analog array (FPAA) architecture featuring a dual mode including discrete-time (DT) and continuous-time (CT) operation modes, along with a highly routable connection boxes (CBs) based interconnection lattice. The dual mode circuit for the FPAA is capable of achieving targeted optimal performance in different applications. The architecture utilizes routing switches in a CB not only for the signal interconnection purpose but also for control of the electrical charge transfer required in switched-capacitor circuits. This way, the performance of the circuit in either mode shall not be hampered with adding of programmability. The proposed FPAA is designed and implemented in a 0.18 μm standard CMOS process with a 3.3 V supply voltage. The result from post-layout simulation shows that a maximum bandwidth of 265 MHz through the interconnection network is achieved. The measured results from demonstrated examples show that the maximum signal bandwidth of up to 2 MHz in CT mode is obtained with the spurious free dynamic range of 54 dB, while the signal processing precision in DT mode reaches 96.4%.

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Section: Detailed Schematic Of the Rail To Rail Operational Amplifiermentioning

confidence: 99%

Design and analysis of a dual mode CMOS field programmable analog array

et al. 2014

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“…It is well-known that circuits capable of rail-torail input voltage swing are the best solution for maintaining the required DR when the circuits are operated with lowvoltage supply. The original technique for implementing the rail-to-rail input voltage swing of circuits is the use of differential pairs that are composed of both PMOS and NMOS transistors [1]. However, this technique is complex due to the additional differential pair, current branches and the circuitry used to maintain constant transconductance over the whole input voltage range.…”

Section: Introductionmentioning

confidence: 99%

31.3 nW, 0.5 V Bulk-Driven OTA for Biosignal Processing

2023

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This paper presents a new extremely low-voltage low-power bulk-driven (BD) operational transconductance amplifier (OTA) realized for low frequency biosignal processing. The CMOS structure of the OTA utilizes bulk-driven and self-cascode techniques in the subthreshold region, supporting the operation with the supply voltage (V DD ) as the threshold voltage (V TH ) of a single MOS transistor, i.e., V DD = V TH = 0.5 V, while offering nano power consumption (31.3 nW for 15 nA nominal setting current). Using the extremely low-voltage and low-power OTA in biosignal processing enables extending the lifetime of applications that are powered by battery or energy harvesting sources. The OTA has a 54.7 dB low frequency gain, 6.18 kHz gain bandwidth and 75 • phase margin at 15 pF load capacitance. The proposed OTA has been used to realize a bandpass filter (BPF) with adjustable gain for electrocardiogram (ECG) signal processing. The higher cutoff frequency of the BPF is adjustable electronically by a setting current and the BPF's gain can be adjusted by capacitors value. The total harmonic distortion (THD) of the BPF is −53.56 dB, the input integrated input-referred voltage noise is 17.9 µV rms , the common mode rejection ratio (CMRR) is 75 dB and the power supply rejection ratio (PSRR) is 87.7 dB. The BPF was designed in the Cadence program using 0.18 µm CMOS technology from TSMC. The simulation results agree with the presented theory.INDEX TERMS Operational transconductance amplifier (OTA), bulk-driven, band-pass filter, low-voltage, low-power CMOS. FABIAN KHATEB received the M.Sc. and Ph.D. degrees in electrical engineering and communication and the M.Sc. and Ph.D. degrees in business and management from the

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“…Esta topologia é ideal para amplificadores operacionais que operam com alta tensão de alimentação [31], [33]. Contudo, a fonte de corrente flutuante resulta do empilhamento de duas tensões de threshold, inviável para amp-ops alimentados com tensões abaixo de 3V, principalmente se algum destes transistores está sujeito ao efeito de corpo.…”

Section: Figura 35: Estágio De Entrada Rail-to-rail Com Fonte De Corr...unclassified

“…Dentre elas, destaca-se uma estrutura que, apesar de sua simplificade, mostra-se extremamente eficiente na polarização em classe AB dos transistores de saída. Apresentada na Figura 3.7, esta estrutura pode ser encontrada em uma série de amp-ops [14], [31]- [33]. através do transistor M18 é unidirecional, é preciso um segundo transistor (M17), complementar ao anterior e em paralelo, para acoplar de forma bidirecional os transistores de saída.…”

Section: Figura 35: Estágio De Entrada Rail-to-rail Com Fonte De Corr...unclassified

Projeto de um amplificador operacional CMOS de baixa tensão do tipo rail-to-rail

Lacerda¹,

Filho²

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Este trabalho descreve o procedimento de projeto de amplificadores operacionais em tecnologia CMOS. Para isto, foram objetos deste processo dois amplificadores com especificações distintas. O primeiro foi o amplificador canônico com compensação interna do tipo Miller, cujas especificações incluíram a tensão de alimentação de 3V, o ganho mínimo de malha aberta em baixas freqüências de 60dB e a freqüência de ganho unitário de 4MHz para uma carga externa de 10k em paralelo com 10pF. O segundo, já aplicando o aprendizado que resultou do primeiro, foi um amplificador operacional do tipo rail-to-rail na entrada e na saída, com especificações mais exigentes: tensão de alimentação de 3V, ganho mínimo de malha aberta em baixas freqüências de 80dB e freqüência de ganho unitário de 10MHz para carga externa de 10k em paralelo com 10pF.Os resultados obtidos a partir de protótipos fabricados em tecnologia CMOS de 0,8 m para o primeiro amplificador e 0,6 m para o segundo foram bastante próximos às especificações. Por exemplo, as excursões de entrada e de saída do segundo amplificador mostraram-se perfeitamente compatíveis com amp-ops rail-to-rail tipicos enquanto as demais características medidas confirmaram que o procedimento de projeto adotado foi bastante adequado.

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A rail-to-rail, constant gain, buffered op-amp for real time video applications

Cited by 25 publications

References 8 publications

Design and analysis of a dual mode CMOS field programmable analog array

Design and analysis of a dual mode CMOS field programmable analog array

31.3 nW, 0.5 V Bulk-Driven OTA for Biosignal Processing

Projeto de um amplificador operacional CMOS de baixa tensão do tipo rail-to-rail

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