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Four-input transconductance amplifier for fully differential Gm-C filter

A transconductance amplifier, four-input technology, used in differential amplifiers, amplifiers with semiconductor devices/discharge tubes, DC-coupled DC amplifiers, etc. The effect of power consumption

Active Publication Date: 2015-05-27
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using the traditional filter design method, directly connecting two identical two-input transconductance amplifiers in parallel will cause an increase in power consumption, which does not meet the design requirements for low power consumption

Method used

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  • Four-input transconductance amplifier for fully differential Gm-C filter
  • Four-input transconductance amplifier for fully differential Gm-C filter
  • Four-input transconductance amplifier for fully differential Gm-C filter

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Such asfigure 1 As shown, it is a four-input transconductance amplifier for a fully differential Gm-C filter, including two differential voltage-current conversion stages and a shared current output stage, and the two differential voltage-current conversion stages are called voltage-current conversion stages. Stage A and voltage-current conversion stage B; the differential voltage-current conversion stage consists of a super source follower and a passive resistor. The super source follower accurately replicates the differential input voltage through feedback, and converts it into a differential output current after being applied to the passive resistor; The differential output current of voltage-to-current conversion stage A is The differential output current of voltage-to-current conversion stage B is The currents output by the voltage-current conversion sta...

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Abstract

The invention discloses a four-input transconductance amplifier for a fully differential Gm-C filter. The four-input transconductance amplifier comprises a voltage-current conversion stage A, a voltage-current conversion stage B and a sharing current output-stage circuit. The four-input transconductance amplifier adopts a highly linear transconductance amplifier based on a current conveyor and consists of the voltage-current conversion stages and the current output stage, and output of the two fully differential voltage-current conversion stages is connected in parallel to share the current output stages, so that a four-input two-output transconductance amplifier is realized. Compared with a conventional realizing mode of directly connecting two same transconductance amplifiers in parallel, a function of adding and subtracting differential output current is directly realized, and the power consumption of the current output stages is reduced. Meanwhile, compared with the conventional realizing mode, the Gm-C filter disclosed by the invention has the same frequency characteristics.

Description

technical field [0001] The invention relates to a four-input transconductance amplifier used in a fully differential Gm-C filter. Background technique [0002] In the past ten years, with the rapid development of wireless communication technology and the continuous progress of integrated circuit technology, interdisciplinary wireless sensor network (WSN) technology has emerged. Due to its distributed, self-organizing and low-cost characteristics, WSN technology puts forward low power consumption, high integration and low-cost design requirements for its core module radio frequency transceiver. As an important module in the receiver, the analog integrated filter is located in the rear stage of the down-mixing and the front stage of the variable gain amplifier. In addition to the useful channel signal, the IF signal after down-mixing also contains out-of-band interference signals. If it is not filtered out, it will cause the gain saturation of the subsequent stage circuit and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45H03F1/34
CPCH03F1/0227H03F1/3211H03F3/45179H03F2203/45031H03F2203/45091H03F2203/45098
Inventor 吴建辉周明杰李红陈超黄成
Owner SOUTHEAST UNIV
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