High-dynamic-range variable gain amplifier with temperature compensation and linear-in-decibel gain control

Carrara, F.; Filoramo, P.; Palmisano, G.

doi:10.1049/el:20040247

Cited by 8 publications

(2 citation statements)

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“…An exponential generator circuit produces an output signal (voltage or current) which is an exponential function of a control signal [6]. Using BiCMOS or bipolar processes the exponential function can be easily implemented using the exponential input characteristic I C /V BE of a bipolar transistor [7]. However, it is difficult to realize this exponential function in pure CMOS processes due to inherent square or linear characteristics of MOS devices operated in strong inversion.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, the usage of the exponential input characteristics of bipolar or MOS in weak inversion has the disadvantage of the strong temperature dependency, which is mainly caused by the thermal voltage [4,7,[11][12][13][14]. Therefore, regardless to design method, an accurate and stable exponential generator imposes temperature compensation.…”

Section: Introductionmentioning

confidence: 99%

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1.5-V CMOS exponential current generator

Kalenteridis

Vlassis

Siskos

2012

Analog Integr Circ Sig Process

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A new low-voltage CMOS exponential current generator is proposed in this work. MOS transistors in weak-inversion region and a master-slave technique for the temperature compensation were used. The circuit was fabricated with standard CMOS 0.35 lm process using a single supply voltage of 1.5 V. Experimental results validate the theoretical analysis and verify the effectiveness of the proposed structure. A 40 dB range linearly in dB controlled output current with less than 1.5 dB linearity error was achieved. The structure features ±1 and ±3 dB deviations for ±10% supply voltage and 80°C temperature variations, respectively.

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Section: Introductionmentioning

confidence: 99%