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A Fully Differential Power Current Amplifier with Noise Cancellation Circuit

A current amplifier and noise cancellation technology, which is applied in power amplifiers, differential amplifiers, DC-coupled DC amplifiers, etc., can solve the problems of no literature introduction, no patent documents found, etc., to increase gain, reduce noise contribution, improve The effect of noise performance

Active Publication Date: 2016-08-31
HUAWEI TEHCHNOLOGIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there is no relevant literature introduction, and no relevant patent documents have been found.

Method used

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  • A Fully Differential Power Current Amplifier with Noise Cancellation Circuit
  • A Fully Differential Power Current Amplifier with Noise Cancellation Circuit
  • A Fully Differential Power Current Amplifier with Noise Cancellation Circuit

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Embodiment Construction

[0022] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings.

[0023] like figure 1 A fully differential power current amplifier with a noise canceling circuit shown is composed of a fully differential power current amplifier body and a noise canceling circuit. Wherein, the fully differential power current amplifier body is composed of two identical groups of Nullors, current parallel negative feedback networks, and current series negative feedback networks to form a symmetrical differential structure, and wherein the current series negative feedback network is realized by a transformer, The current parallel negative feedback network is realized by a single resistor; the noise cancellation circuit is composed of two groups of identical noise current detection stages, a current-voltage conversion stage, a voltage-current conversion stage and a ...

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Abstract

The invention discloses a full differential power current amplifier provided with noise cancellation circuits. The full differential power current amplifier comprises a full differential power current amplifier body and the noise cancellation circuits, wherein the full differential power current amplifier comprises a symmetric differential structure formed by two groups of identical Mullors, current parallel negative feedback networks and current series negative feedback networks; the current series negative feedback networks are realized by the aid of transformers, and the current parallel negative feedback networks are realized by the aid of a single resistor; the noise cancellation circuits comprise two groups of identical noise current detection stages, current-voltage switching stages, voltage-current switching stages and mixed current synthetic stages cascaded sequentially; and each group of the noise cancellation circuits corresponds to a half circuit of the full differential power current amplifier. According to the full differential power current amplifier provided with the noise cancellation circuits, noise of a transformer feedback network in the full differential power current amplifier can be reduced.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, and in particular relates to a fully differential power current amplifier with a noise cancellation circuit. Background technique [0002] The output signal of the fully differential power current amplifier is a differential current. When it has a large enough gain, it can directly drive the switch stage of the mixer, eliminating the transconductance stage of the mixer, thus forming a new type of RF front-end circuit, compared with the traditional RF front-end current, the circuit has higher linearity, process consistency and robustness. [0003] However, since the noise contribution of the feedback network in the power current amplifier is relatively large (accounting for about 20%, see reference [1]), when a symmetrical differential structure is formed, the noise of the feedback network is also doubled correspondingly, resulting in the noise of the entire amplifier Noise per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/45H03F3/20H03F1/26
Inventor 李效龙何章斌杨奕飞王彪张贞凯向海健
Owner HUAWEI TEHCHNOLOGIES CO LTD
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