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Circuit and method for promoting bandwidth enhancement of low noise amplifier

A low-noise amplifier and circuit technology, applied in low-noise amplifiers, improved amplifiers to expand bandwidth, amplifiers, etc., can solve the problems of large chip size, poor noise figure, high DC power consumption, etc., and achieve the effect of widening the gain bandwidth

Active Publication Date: 2017-10-24
CITY UNIVERSITY OF HONG KONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these topologies are limited in application due to drawbacks such as large die size, high DC power consumption, poor noise figure, etc.

Method used

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  • Circuit and method for promoting bandwidth enhancement of low noise amplifier
  • Circuit and method for promoting bandwidth enhancement of low noise amplifier
  • Circuit and method for promoting bandwidth enhancement of low noise amplifier

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Embodiment Construction

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0026] In the following description, numerous specific details are set forth in order to provide a thorough understanding of various embodiments. One skilled in the relevant art will recognize that the techniques described herein may be practiced without one or more of these specific details, or with other methods, components, materials, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail ...

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Abstract

The present invention provides a circuit and a method for promoting bandwidth enhancement of a low noise amplifier. The circuit includes a first transistor including a first gate, a first drain, and a first source; a second transistor including a second gate, a second drain, and a second source, wherein the first transistor and the second transistor form a cascode topology; and a transformer, which is embedded in the second gate of the second transistor and the second drain between the terminals. The conventional source-to-cathode feedback cascode low-noise amplifier is extended to a wide gain bandwidth by embedding a transformer between the gate and drain of a common-gate transistor. The embedded transformer can introduce an additional pair of high-frequency conjugate poles that can push the gain drop start to a higher frequency, peaking a higher frequency gain, thereby broadening the amplifier gain bandwidth.

Description

technical field [0001] The present invention relates generally to the field of low noise amplifiers, and more particularly, to a circuit and method for facilitating bandwidth enhancement of a low noise amplifier to peak the high frequency gain of the low noise amplifier to produce a broadband gain response. Background technique [0002] An amplifier is an electronic device that increases the power of a signal by taking energy from a power source and controlling the output with a large amplitude that matches the shape of the input signal. In this sense, the amplifier is able to modulate the power supply so that the output signal is stronger than the input signal. Amplifiers and attenuators are effectively opposites: while amplifiers provide gain, attenuators provide loss. [0003] An amplifier can be a single device or a circuit within another device. Amplification capability is fundamental to modern electronic devices, and amplifiers are widely used in electronic devices. ...

Claims

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Application Information

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IPC IPC(8): H03F1/48H03F1/26H03F3/193H03F3/20H03G3/30
CPCH03F1/26H03F1/483H03F3/193H03F3/20H03G3/3036H03F2200/372H03F2200/451H03F2200/492H03F3/195H03F1/223H03F2200/541H03F2200/294H03F1/347H03F1/565H03F1/42H03F2200/225
Inventor 薛泉秦培岑鉴文
Owner CITY UNIVERSITY OF HONG KONG
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