Novel low-complexity broadband variable gain amplifier

A gain amplifier and low-complexity technology, applied in amplifiers, differential amplifiers, amplifiers with semiconductor devices/discharge tubes, etc., can solve problems such as increased circuit complexity, increased chip area, increased chip production costs, and increased system power consumption , to achieve the effect of enhancing equivalent input transconductance, expanding bandwidth, and wide dB linear range

Inactive Publication Date: 2016-10-26
SOUTH CHINA UNIV OF TECH
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  • Description
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Problems solved by technology

The existing VGA usually increases its linearity and dB linear range by adding a relatively complex exponential generating circuit, which increases the complexity of the circuit and the area of ​​the chip, a...

Method used

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  • Novel low-complexity broadband variable gain amplifier
  • Novel low-complexity broadband variable gain amplifier
  • Novel low-complexity broadband variable gain amplifier

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Embodiment Construction

[0026] refer to figure 1 , a novel low-complexity wideband variable gain amplifier of the present invention comprises an active load circuit, a current source circuit, a differential input circuit, a gm-boost circuit and a gain control circuit, and the active load circuit is connected with the gm-boost circuit respectively It is connected with the differential input circuit, and the current source circuit is respectively connected with the differential input circuit, the gm-boost circuit and the gain control circuit.

[0027] Preferably, the active load circuit is used to compensate the pole of the system of the present invention to achieve the purpose of extending the bandwidth of the VGA. The current source circuit is used to provide a current source for the present invention, so that it can work at a suitable static operating point. The gm-boost circuit is used to enhance the equivalent input transconductance of the present invention to improve linearity. The differential...

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Abstract

The invention discloses a novel low-complexity broadband variable gain amplifier. The novel low-complexity broadband variable gain amplifier comprises an active load circuit, a current source circuit, a differential input circuit, a gm-boost circuit and a gain control circuit. The active load circuit is respectively connected with the gm-boost circuit and the differential input circuit; and the current source circuit is respectively connected with the differential input circuit, the gm-boost circuit and the gain control circuit. The novel low-complexity broadband variable gain amplifier can realize a dB linear relationship of input and output without an index generation circuit, efficiently enhances equivalent input transconductance of VGA through the gm-boost circuit, enables the VGA to have relatively high linearity and a relatively wide dB linearity range, and also greatly expands the broadband of the VGA under the precondition of not adding the VGA power consumption through the active load circuit. The novel low-complexity broadband variable gain amplifier can be widely applied to an amplifier product.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a novel low-complexity broadband variable gain amplifier. Background technique [0002] VGA is a variable gain amplifier. In an analog integrated circuit system, VGA can adjust different signal gains according to different control voltages. In the fields of wireless communication transceiver system, human body medium communication, disk access circuit and weak signal processing, due to the influence of factors such as communication distance, transmission path and blocking fading, the dynamic range of the received signal is large. Therefore, in order to ensure better stability of the received signal, the adjustable characteristic of the gain of the receiving system becomes particularly important. VGA can adjust the output gain according to the feedback signal, and stabilize the received signal near a predetermined amplitude. The linearity, dB linear range and bandwid...

Claims

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Application Information

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IPC IPC(8): H03F1/42H03F3/45
CPCH03F1/42H03F3/45636
Inventor 吴朝晖陈振业赵明剑李斌
Owner SOUTH CHINA UNIV OF TECH
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