A gain-adjustable low noise amplifier with single-ended input and double-ended output
A low-noise amplifier, single-ended input technology, used in DC-coupled DC amplifiers, amplifiers, differential amplifiers, etc., can solve the problems of unbalanced output signals and insufficient LNA gain, achieve adjustable circuit gain, improve circuit gain and The effect of gain flatness
Active Publication Date: 2018-05-29
WUHAN SYNTEK CO LTD
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Problems solved by technology
[0004] Aiming at the problem of insufficient gain and unbalanced output signal of LNA with single-ended input and double-ended output, the present invention provides a low-noise amplifier with adjustable gain of single-ended input and double-ended output
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[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0028] This embodiment provides a low noise amplifier with adjustable gain with single-ended input and double-ended output, refer to figure 1 , The low-noise amplifier includes: a single-ended input terminal In1, a single slip amplifier circuit 100, a first-stage buffer circuit 200, a second-stage buffer circuit 300, a first differential output terminal OUT3 ± and a second differential output terminal OUT5 ±.
[0029] The single-ended inpu...
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The invention discloses a single-end input and double-end output gain adjustable low noise amplifier. The amplifier comprises a single-end input end, a single-to-differential amplification circuit (100), a first level buffer circuit (200), a second level buffer circuit (300), a first differential output end and a second differential output end. The single-end input end is used for inputting single-end input signals; the single-to-differential amplification circuit (100) is used for carrying out differential amplification to the single-end input signals; the first level buffer circuit (200) is used for filtering and amplifying the differential signals output by the single-to-differential amplification circuit (100); the second level buffer circuit (300) is used for further amplifying and carrying out phase and amplitude adjustment to the differential signals output by the first level buffer circuit (200); and the first differential output end and the second differential output end are used for selectively outputting the differential output signals of the low noise amplifier. According to the amplifier, the circuit gain is adjustable; and output signal balance and gain flatness are realized.
Description
Technical field [0001] The invention belongs to the field of low-noise amplifiers, and relates to a low-noise amplifier with adjustable gain with single-ended input and double-ended output. Background technique [0002] In recent years, wireless communication technology has been continuously developed to meet the different needs of various industries. Low-noise amplifiers are often used in the front-end of radio frequency receiving systems, which play a vital role in the overall performance of the receiving system. They need a certain gain to amplify the weak signals received by the antenna and suppress the noise interference of the system's back-end circuits. The noise figure of the antenna should be low and the linearity should be high, so as to process larger signals, and at the same time, it is necessary to convert the single-ended signal received from the antenna into a differential output signal. The difficulty in the design of low noise amplifiers lies in the need to comp...
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IPC IPC(8): H03F1/26H03F3/45
CPCH03F1/26H03F3/45179
Inventor 张科峰余杨
Owner WUHAN SYNTEK CO LTD