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Data bit (dB) linear variable gain amplifier

A technology for gain amplifiers and amplifiers, which is applied in the direction of gain control, amplification control, and electrical components, and can solve the problem of performance deterioration in the working area, device operating frequency, noise, etc., and small input and output voltage ranges regardless of the bias of the MOS device. etc. to achieve the effects of constant settling time, elimination of DC offset, and obvious linearity

Inactive Publication Date: 2013-04-10
TIANJIN UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following disadvantages at the same time: the input and output voltage range is small, the bandwidth of the amplifier is not enough, and the DC offset is serious
Although MOS devices operating in the subthreshold region have intrinsic exponential characteristics, due to the serious deterioration of the operating frequency and noise performance of the device in this region, it is generally not considered to bias the MOS device in this region in radio frequency integrated circuits. Work area

Method used

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  • Data bit (dB) linear variable gain amplifier
  • Data bit (dB) linear variable gain amplifier
  • Data bit (dB) linear variable gain amplifier

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Embodiment Construction

[0033] The present invention will be further described in detail below in combination with specific embodiments.

[0034] Such as figure 1 Shown, a kind of dB linear variable gain amplifier of the present invention, its overall structure is controlled by the first-stage variable gain amplifier and DC offset circuit A, the second-stage variable gain amplifier and DC offset circuit B and exponential gain Circuit composition.

[0035] The first-stage variable gain amplifier and the DC offset elimination circuit A are used to amplify or attenuate the signal and eliminate the DC offset; the second-stage variable gain amplifier and the DC offset elimination circuit B are used to amplify the signal The second stage amplifies or attenuates and eliminates the DC offset; the exponential gain control circuit makes the control voltage and the gain of the amplifier have an exponential relationship, that is, a linear relationship in dB, so that the establishment time of the amplifier has n...

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Abstract

The invention discloses a data bit (dB) linear variable gain amplifier. The dB linear variable gain amplifier is formed by a premier variable gain amplifier, a removing direct current offset circuit A, a secondary variable gain amplifier, and a removing direct current offset circuit B which are used for amplifying signals or weakening and removing direct current offset. Control voltage and gain of the amplifiers are enabled to be in an exponential relationship by an index gain control circuit. Each removing direct current offset circuit is formed by a GM-C tan-conductance filter and a common-mode feedback circuit. Input of the premier variable gain amplifier is used as input of the whole circuit. Output of the premier variable gain amplifier is connected with input of the secondary variable gain amplifier. Output of the secondary variable gain amplifier is used as output of the whole circuit. The dB linear variable gain amplifier is improved based on a Gilbert unit, is used in an automatic gain control circuit, and enables the amplifier to have larger broadband and better linear degree.

Description

technical field [0001] The invention relates to an integrated circuit design technology and the communication field, in particular to a dB linear variable gain amplifier. Background technique [0002] In a wireless communication system, due to different situations, there are different distances between the transmitter and the receiver, coupled with the time-varying nature of the communication channel and the interference of external noise, the influence of these factors will cause the signal to be strong and weak at times, resulting in reception The amplitude range of the machine input signal varies greatly (up to tens of dB). In order to receive signals as reliably as possible, the receiver is usually equipped with an automatic gain control circuit (Automatic Gain Control, AGC), and the variable gain amplifier is the main part of the AGC system. [0003] In the audio / video analog system, the amplifier is mainly required to have a large bandwidth, a large input and output r...

Claims

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Application Information

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IPC IPC(8): H03G3/20
Inventor 赵毅强于海霞张杨盛云岳森
Owner TIANJIN UNIV
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