Patent
Rail-to-rail input / output operational amplifier and method
TLDR
In this paper, a rail-to-rail differential amplifier with differentially connected N-channel first and second input transistors and P-channel third and fourth inputs transistors is presented.Abstract:
A rail-to-rail differential amplifier includes first and second input terminals, and an output terminal and an input stage including differentially connected N-channel first and second input transistors, and differentially connected P-channel third and fourth input transistors. A P-channel first cascode transistor has a source coupled to a first supply voltage to the drain of the first input transistor. An N-channel cascode transistor has a source coupled by a second resistive element to a second supply voltage and to the drain of the third input transistor. A first gain boost amplifier has an output coupled to a gate of the first cascode transistor, a first input coupled to the source of the first cascode transistor and the drain of the first input transistor, and a second input coupled to a drain of the second input transistor and a bias control circuit. A second gain boost amplifier has an output coupled to a gate of the second cascode transistor, a first input coupled to the source of the second cascode transistor and to the drain of the third input transistor, and a second input coupled to a drain of the fourth input transistor and the bias control circuit. An output stage includes a pull-up transistor coupled between the first supply voltage and the output terminal, a pull-down transistor coupled between the second supply voltage and the output terminal, and a class AB bias circuit coupled between drain electrodes of the fist and second cascode transistors and between gate electrodes of the pull-up and pull-down transistors.read more
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References
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Journal ArticleDOI
Compact low-voltage power-efficient operational amplifier cells for VLSI
TL;DR: In this article, the authors describe a rail-to-rail class-AB output stage with folded mesh feedback control that combines power efficiency with operation down to 1.8 V and allows sufficient gain in a compact two-stage topology.
Patent
Combination drive-summing circuit for rail-to-rail differential amplifier
Johan H. Huijsing,John Tero +1 more
TL;DR: In this article, a combination driver/summing circuit for rail-to-rail operation of a differential amplifier is presented, where the driver is coupled to the summing circuit to derive at least one output signal representative of the input signal and which is operative over nearly the full rail to-rail supply voltage range.
Patent
Folded cascode amplifier with rail-to-rail common-mode range
TL;DR: In this paper, a folded cascode amplifier with rail-to-rail common-mode range is presented, which utilizes a fully differential input with two sets of input common source amplifier devices.
Patent
CMOS operational amplifiers having reduced power consumption requirements and improved phase margin characteristics
TL;DR: In this paper, a preferred bias signal generator sequentially enables the cascode current mirror and then the differential input stage in response to a rising edge of the clock signal and disables both the current source and the cascade current mirror.
Patent
High speed fully differential operational amplifier with fast settling time for switched capacitor applications
Laurence D. Lewicki,Ion E. Opris +1 more
TL;DR: In this article, a high-speed fully differential operational amplifier with fast settling time for switched capacitor applications includes a high gain active cascode applied to the operational amplifier's input stage transistors to improve the gain, provide a higher output impedance, and thus, reduce the Miller feedback gate drain capacitance of the input stage devices.
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