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Open loop variable gain amplifier using replica gain cell and signal amplification method

A technology of gain amplifier and gain control signal, which is applied in the direction of DC coupled DC amplifier, amplifier, amplifier with semiconductor device/discharge tube, etc.

Inactive Publication Date: 2010-05-26
INFINEON TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This further limits the application of VGAs with smaller processing and / or lower voltage technologies

Method used

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  • Open loop variable gain amplifier using replica gain cell and signal amplification method
  • Open loop variable gain amplifier using replica gain cell and signal amplification method
  • Open loop variable gain amplifier using replica gain cell and signal amplification method

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Embodiment Construction

[0017] One of the most critical factors in the design of fast signal processing systems is the combined bandwidth of all components in the signal path, resulting signal distortion, and loss of signal strength. The signal path is defined as the path, ie the circuit and connections, the input signal is processed, ie amplified to the output, which is the signal passed to a subsequent processing / circuit stage. Two forms of variable gain amplifier (VGA) structures are generally available, closed loop and open loop, for incorporation into such signal processing systems. Closed loop maintains signal gain and circuit stability through a feedback loop in the signal path that recirculates the amplified output signal, typically through an operational amplifier and resistor network. Open-loop VGAs, on the other hand, do not impose a feedback loop in the signal path, but rely only on externally generated signals to adjust signal gain and circuit stability.

[0018] figure 1 A closed-loop...

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Abstract

A variable gain amplifier ('VGA') having an open loop architecture is disclosed. The VGA includes one or more gain cells coupled in the signal path to amplify a given input signal. The VGA further includes a replica gain cell having a gain servo circuit which amplifies a gain reference signal according to a programmable gain input and equalizes the amplified reference signal to the original unamplified reference signal, continuously generating a gain control input to the signal path gain cells based on the equalization. This gain control input reflects the gain set by the programmable gain input as adjusted for process, temperature and supply voltage variations. The replica gain cell further includes a common mode voltage servo circuit which senses the common mode voltage of the amplifiedreference signal and equalizes it to a common mode voltage reference, generating a common mode voltage control signal to the signal path gain cells to regulate their common mode voltage. This regulation of the common mode voltage of the signal path gain cells is compensated for process, temperature and supply voltage variations.

Description

technical field [0001] The invention relates to an open-loop variable gain amplifier and a signal amplification method, in particular to an open-loop variable gain amplifier and a signal amplification method with a copy gain unit applied. Background technique [0002] An important analog building block, especially in analog signal processing systems, is the variable gain amplifier (VGA). In many signal processing and data acquisition systems that include an analog-to-digital converter (A / D converter), the VGA circuit is a necessary component. It is generally preferred to apply the VGA before a data converter, such as an A / D converter, to effectively apply the dynamic input range of the converter. [0003] As signal processing speeds continue to rise, there is a need for ever faster converters, hence faster VGAs. Unfortunately, a typical VGA is limited by its operating speed and bandwidth due to its circuit design. Furthermore, the operating coefficient of the VGA is sensi...

Claims

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Application Information

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IPC IPC(8): H03F3/45H03G3/30H03G1/00
CPCH03F3/4565H03F2203/45644H03G1/0088H03F3/45183H03F2203/45702
Inventor S·哈尔特
Owner INFINEON TECH AG
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