Improved logarithmic converter based on a transconductance feedback amplifier

Wilson, B.; Al-Gahtani, M.

doi:10.1109/iscas.2001.921940

Cited by 8 publications

(8 citation statements)

References 6 publications

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“…where transconductance G represents a power FET driven into saturation and cut-off, a linearisation effect might be possible. For low-to-medium frequency applications in analogue VLSI, transconductance feedback has been shown to be attractive [17,18].…”

Section: Sensitivity Functionsmentioning

confidence: 99%

Investigation into RF feedback for improving the efficiency-linearity trade-off in power amplifiers

Tian

Haigh

2006

2006 Asia-Pacific Microwave Conference

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Power amplifiers are important blocks in communication systems and their efficiency and linearity are critical performance parameters. In this paper, we present a preliminary investigation into RF feedback systems designed to improve the efficiency-linearity trade-off for power amplifiers. We demonstrate very large potential improvement in trade-off due to feedback and significant actual improvement. In order to fully realise the potential improvement, further work needed is outlined.

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Section: Sensitivity Functionsmentioning

confidence: 99%

Investigation into RF feedback for improving the efficiency-linearity trade-off in power amplifiers

Tian

Haigh

2006

2006 Asia-Pacific Microwave Conference

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“…3(a) [3] is actually a translinear circuit with accurate logarithmical characteristic, but it only responds to slowly changing signal and is incapable of processing IF signal. For the reasons above, true logarithmic amplifier (successive detection RSSI is one type of them) was proposed, whose principle was detailed in the instruction above.…”

Section: Introductionmentioning

confidence: 99%

A low power dB-linear RSSI based on logarithmic amplifier

Tian

Bai

et al. 2014

IEICE Electron. Express

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“…Single stage types use the exponential characteristics of the semiconductor devices such as p-n junction diodes [15], light emitting diodes [16], photo diodes [17], bipolar transistors [18], GaAs MESFETs [19], and MOS transistors in the subthreshold region [20] to create the logarithmic curve. In this technique, the logarithmic amplifiers are usually built using exponential characteristics of diodes or bipolar transistors in the feedback path of an inverting operational amplifier.…”

Section: Introductionmentioning

confidence: 99%

Analysis and design of the true piecewise approximation logarithmic amplifiers

Shaterian

Abrishamifar

Shamsi

2012

Analog Integr Circ Sig Process

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This paper describes the theory of operation, mathematical analysis, modeling and circuit design of the true piecewise approximation logarithmic amplifiers. These logarithmic amplifiers can be realized by the series linear limit and parallel summation methods. Both of these methods are discussed in this paper and their transfer functions are extracted. In addition, making use of the proposed formulas, a new mathematical approach is proposed for improving the characteristics of the parallel summation method. All of the presented methods are modeled in Simulink. Moreover, they are designed in a 0.13 lm CMOS technology and simulated by HSPICE. It is observed that analytical results comply with the simulation results. Considering the dynamic range, power, and area, the parallel summation method shows better performance than its series linear limit counterpart.

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Improved logarithmic converter based on a transconductance feedback amplifier

Cited by 8 publications

References 6 publications

Investigation into RF feedback for improving the efficiency-linearity trade-off in power amplifiers

Investigation into RF feedback for improving the efficiency-linearity trade-off in power amplifiers

A low power dB-linear RSSI based on logarithmic amplifier

Analysis and design of the true piecewise approximation logarithmic amplifiers

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