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Db-linear process-independent variable gain amplifier

A gain amplifier and variable technology, applied in amplifiers, differential amplifiers, DC-coupled DC amplifiers, etc., can solve problems such as temperature sensitivity, incapable of providing repeatable output, incapable of constant repeatable gain, etc.

Active Publication Date: 2011-04-20
MAXIM INTEGRATED PROD INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such deficiencies may include having bumps and ripples in the db linear gain, being temperature sensitive over a given temperature range, not providing repeatable gain constant or over time, or not providing repeatable output due to the manufacturing process of the device

Method used

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  • Db-linear process-independent variable gain amplifier
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Examples

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Embodiment Construction

[0019] Various views and embodiments of a db linear process independent variable gain amplifier are illustrated and described, and other possible embodiments are described, with reference now to the drawings, wherein like numerals are used to refer to like elements throughout. The figures are not necessarily drawn to scale and, in some instances, have been exaggerated and / or simplified as appropriate for illustrative purposes only. Those skilled in the art will appreciate the many possible applications and variations of the following description based on the examples of possible embodiments.

[0020] Embodiments of the present invention provide amplifiers with continuously variable analog control that exhibit a highly linear gain control curve in dB / volt while maintaining large dynamic range, low third order distortion, and low noise. Typically, VGA gain curves deviate significantly from a linear curve (in terms of the relationship between voltage gain in db and their control ...

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PUM

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Abstract

An amplifier is provided with continuously-variable analog control that exhibits a highly linear gain control curve in db / volts, while preserving high dynamic range, low third order distortion, and low noise. This amplifier has a control mechanism that preserves a varied linear or log linear curve over a wide range and is inherently insensitive to process variations thereby allowing more accurate gain control and higher signal fidelity for amplifying high dynamic range signals.

Description

technical field [0001] Embodiments of the present invention relate to circuits for variable gain amplifiers (VGAs), and more particularly, to the design and implementation of variable gain amplifiers exhibiting a substantially linear gain control curve in dB / volt. Background technique [0002] In systems requiring a variable gain amplifier, there are many situations where it is desirable to vary the gain of a variable gain amplifier (VGA) logarithmically. By varying the gain logarithmically, the VGA will provide a fairly constant and nearly linear gain per volt. Linear gain per volt is sometimes called log-linear gain. The inventors have noted that previously known VGA circuit designs generally do not provide smooth log-linear curves, but instead provide curves with bumps or ripples that deviate significantly from a constant slope. The presence of bumps or ripples in existing circuit designs can impact the overall performance of such existing VGA designs. For example, if ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/20H03F3/45
CPCH03F2203/45702H03F2203/45244H03F2203/45508H03F2203/45496H03G1/007H03F2200/453H03F3/45632H03F2203/45506H03G1/0023H03F2203/45492H03F2203/45101H03F2203/45504H03F3/45098H03G3/18H03F2203/45482
Inventor M·乔纳斯
Owner MAXIM INTEGRATED PROD INC
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