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Low-voltage low-power variable gain amplifier

A gain amplifier, amplifier technology, applied in amplifiers, differential amplifiers, amplifiers with semiconductor devices/discharge tubes, etc., can solve problems such as difficulty in designing and implementing variable gain amplifiers

Active Publication Date: 2017-07-14
ANALOG DEVICES INT UNLTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Even though there are many known circuit topologies for variable gain amplifiers, the ever-changing requirements placed on variable gain amplifiers continue to make it difficult to design and implement variable gain amplifiers

Method used

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  • Low-voltage low-power variable gain amplifier
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  • Low-voltage low-power variable gain amplifier

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Embodiment Construction

[0013] Fundamentals of Variable Gain Amplifiers

[0014] Variable gain amplifiers (VGAs) are commonly used in electronic devices. An input to a variable gain amplifier may be amplified based on a gain factor to produce an amplified output. The gain factor can be changed or controlled by controlling the voltage. In general, a variable gain amplifier provides signal conditioning with an electronically settable voltage gain. Variable gain amplifiers are used in a variety of remote sensing and communication equipment. Applications ranging from ultrasound, radar, lidar, wireless communications and speech analysis have utilized variable gain to enhance dynamic performance. VGA can condition signals with a wide dynamic range. For example, an input signal to a wireless receiver can range from microvolts to volts. VGA can be found in communications, cable television, medical equipment, and industrial applications.

[0015] In many high-speed communications applications, includi...

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Abstract

The disclosure relates to a low-voltage low-power variable gain amplifier. In high speed communication applications, e.g., optical communication, a variable gain amplifier is used for input signal amplitude normalization or for linear equalization. Traditionally a bipolar Gilbert multiplier circuit is used. When moving towards a low-power application, a modified circuit topology is implemented to reduce the minimum supply voltage requirement of the variable gain amplifier while ensuring that bias current levels remain substantially the same and achieving the same current switching capacity as the traditional circuit. As a result, the power consumption of the circuit can be greatly reduced. The modified circuit topology combines the amplifier and gain transistors and achieves gain programming using a voltage difference of two pairs of floating voltage sources.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a low-voltage and low-power variable gain amplifier. Background technique [0002] Electronic devices consist of integrated circuits. Integrated circuits process signals and perform countless functions. An analog circuit is a group of circuits that process signals in analog form (ie, continuously variable signals). A common analog circuit is the variable gain amplifier. A variable gain amplifier is a circuit that amplifies an input signal based on a gain factor. The gain factor can be changed or adjusted according to the control voltage. Variable gain amplifiers are found in many audio and optical communications applications. Even though there are many known circuit topologies for variable gain amplifiers, the ever-changing requirements placed on variable gain amplifiers continue to make the design and implementation of variable gain amplifiers difficult. Contents of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45H03G3/30
CPCH03F3/4508H03G3/3036H03G3/3084H03F3/195H03F3/245H03F3/45085H03F3/45103H03G1/0023H03G1/0082H03G1/0088H03G3/001H03F2200/513H03F2203/45458H03F2203/45496H03F2203/45701
Inventor D·阿克司因
Owner ANALOG DEVICES INT UNLTD