Single-end input and double-end output gain adjustable low noise amplifier

Abstract

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 single-end input and double-end output with adjustable gain. Background technique [0002] In recent years, wireless communication technology has been continuously developed to meet the different needs of various industries. The low noise amplifier is often used in the front end of the radio frequency receiving system, which plays a vital role in the overall performance of the receiving system. It needs a certain gain to amplify the weak signal received by the antenna and suppress the noise interference of the system's post-stage circuit. The noise figure must be low and the linearity must be high to handle larger signals, and it is necessary to convert the single-ended signal received from the antenna to a differential output signal. The difficulty in designing a low-noise amplifier lies in the need to compromise the above indicators. [0003] The L...

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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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