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Low noise amplifier capable of implementing differential amplification and method thereof

A low-noise amplifier, differential amplification technology, applied in differential amplifiers, DC-coupled DC amplifiers, improved amplifiers to reduce noise effects, etc., can solve the problems of low-noise amplifiers with multiple off-chip components, high implementation costs, etc. The effect of reducing the complexity and reducing the cost of implementation

Inactive Publication Date: 2010-09-08
RDA MICROELECTRONICS BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In current practical applications, low-noise amplifiers with differential inputs require more off-chip components, especially in applications where the RF input signal is a single-ended signal, and expensive external components are required to complete the transition from single-ended to differential. Transformation, thus resulting in high implementation costs if existing structures are adopted

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  • Low noise amplifier capable of implementing differential amplification and method thereof
  • Low noise amplifier capable of implementing differential amplification and method thereof
  • Low noise amplifier capable of implementing differential amplification and method thereof

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Embodiment Construction

[0015] As shown in Figure 1, in a preferred embodiment, the low noise amplifier of the present invention includes: two first and second single-terminal circuits (10, 20) and a control logic module 14, wherein the first single-terminal circuit 10 acting on the positive input voltage signal further includes: the first and second amplifying sub-circuits (11, 12) and the first phase inversion 180-degree module 13; The second single-terminal circuit 20 acting on the negative input voltage signal further includes: a third and a fourth amplifying sub-circuit ( 21 , 22 ) and a second phase inversion module 23 for 180 degrees.

[0016] The first and third amplifying sub-circuits (11, 21) are respectively used to receive positive and negative input voltage signals, and amplify the positive and negative input voltage signals before outputting; the second . The fourth amplifying sub-circuit (12, 22) is respectively used to receive the output signals of the first and second phase inversion...

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Abstract

The invention discloses a low-noise amplifier which can realize differential amplification and a method. A control logic module is adopted to realize the switching of the low-noise amplifier between a single-ended input mode and a differential input mode, so the low-noise amplifier is led to be suitable for the application situation that a radio-frequency input signal is a differential signal andalso for the application situation that a radio-frequency input signal is a single-ended signal; an internal circuit (a 180-degree phase turnover module) is adopted to obtain a signal which has the same magnitude and 180 phase difference compared with the radio-frequency input signal to ensure the realization of the differential amplification under the application situation that the radio-frequency input signal is the single-ended signal, thereby not only ensuring the linear degree and the noise index of the circuit of the low-noise amplifier, but also reducing the complexity of an external matching circuit needed by the low-noise amplifier in a radio-frequency receiver, and thus lowering implementation cost.

Description

technical field [0001] The present invention relates to a low-noise amplifier in an integrated radio frequency receiver, in particular to a low-noise amplifier that can realize differential amplification (differential output) no matter it works in a differential input mode or a single-ended input mode; the present invention also relates to A method of implementing differential amplification inside a low noise amplifier. Background technique [0002] In a modern integrated radio frequency receiver, a low noise amplifier is an important module circuit for amplifying the received weak radio frequency signal. In weak signal environments, the amplifier's own noise may seriously interfere with the signal, deteriorating the signal-to-noise ratio. The low noise amplifier has a very low noise figure, which greatly reduces the interference to weak signals. [0003] At present, the low noise amplifier usually adopts the structure of differential input and differential output. The di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/26H03F3/45
Inventor 席占国魏述然尹雪松
Owner RDA MICROELECTRONICS BEIJING