Low-noise and high-linearity amplifier
A high linearity and amplifier technology, applied in low noise amplifiers, amplifiers, differential amplifiers, etc., can solve problems such as low IIP intercept point, single amplifier characteristics, and low noise figure
Pending Publication Date: 2017-06-13
常州无线电厂有限公司
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Problems solved by technology
However, in the prior art, the characteristics of the amplifier are mostly single performance, or the gain is large and the IIP intercept point is low, or the IIP intercept point is satisfied but the noise figure does not meet the requirements, and the antenna small signal cannot be fully restored or amplified.
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[0019] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0020] Such as figure 1 and 2 Shown, a kind of low-noise high-linearity amplifier is characterized in that, comprises differential cascade amplifier circuit and feedforward linear circuit, and differential cascade amplifier circuit is connected in feedforward linear circuit as main and auxiliary amplifier device;
[0021] The differential cascade amplifier circuit includes differential transformers T1, T2, grounding resistors R1, R4, power supplies Vc, Vb and a transistor circuit module, the transistor circuit module has a symmetrical structure, including capacitors C1, C2, C3, resistor R2 , R3, inductors L1, L2, L3 and transistors Q1, Q2 form a non-inverting amplification circuit for differen...
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The invention discloses a low-noise and high-linearity amplifier. The low-noise and high-linearity amplifier is characterized by comprising a differential cascaded amplifying circuit and a feedforward linear circuit, wherein the differential cascaded amplifying circuit is connected to the feedforward linear circuit as a primary and auxiliary amplifying device, so that the feedforward linear circuit is divided into two loops, the first stage of loop is used for canceling signals, and the second stage of loop is used for eliminating errors. The low-noise and high-linearity amplifier has the advantages that multiple amplifying elements are utilized by the differential cascaded amplifying circuit, so that the gain amplification power is ensured; and due to the feedforward linear circuit, the amplifier has a relatively low noise coefficient, high IIP2 performance and high IIP3 performance, and the amplifier is improved by 3-4dB in comparison with the same amplifier.
Description
technical field [0001] The invention relates to a low-noise and high-linearity amplifier, which belongs to the technical field of signal acquisition. Background technique [0002] In some cases, when the signal received by the antenna is transmitted to the short-wave receiving equipment for analysis and processing, there will be a certain loss, so it is necessary to compensate and amplify the received signal in advance to improve the signal quality. Therefore, the amplifier used for signal amplification must have low noise and high linearity capabilities to ensure that the signal is not distorted after amplification to the greatest extent. In the prior art, the characteristics of the amplifier are mostly single performance, or the gain is large and the IIP intercept point is low, or the IIP intercept point is satisfied but the noise figure does not meet the requirements, and the antenna small signal cannot be fully restored or amplified. Contents of the invention [0003]...
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IPC IPC(8): H03F1/30H03F1/32H03F3/45
CPCH03F1/302H03F1/3211H03F1/3223H03F3/45098H03F2200/294
Inventor 李如亚
Owner 常州无线电厂有限公司