Db-linear variable gain amplifier (vga) stage with a high broad band

An operational amplifier and wide bandwidth technology, which is applied in the direction of gain control, amplification control, and control of components of the amplification device, etc., and can solve problems such as increasing circuit complexity
CN1555601AInactive Publication Date: 2004-12-15LANTIQ BET GMBH & CO KG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LANTIQ BET GMBH & CO KG
Publication Date
2004-12-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a VGA stage having a novel circuit configuration for amplifying / attenuating a differential input signal which is transmitted via a transmission line (H). The VGA stage comprises an operational amplifier (OPV1, OPV2), which is connected as shunt feedback, for amplifying the input signal; a string of resistors (R01, R01') for attenuating the signal; and a control device (2) for switching the string of resistors (R01, R01').
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Description

technical field

[0001] The present invention relates to a broadband VGA stage, in particular for amplifying / attenuating differential input signals with a wide dynamic range. Background technique

[0002] A VGA (Variable Gain Amplifier) ​​stage is used to convert a variable input signal into an output signal with a fixed amplitude. Modern VGA stages have to meet high requirements for linearity characteristics and bandwidth which can cause problems especially if the input signal has a wide dynamic range (eg from 20mV to 2V).

[0003] In order to meet the above criteria, the problem is, especially due to the fact that sending the application-dependent signal over different cable lengths between the transmitter and the receiver, and the receiver's input amplifier has to handle amplitudes ranging from e.g. -20dB to + Signal between 20dB, at the same time, the amplifier must have excellent linearity, best offset and noise characteristics. In addition, the amplifier must not sign...

Claims

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