Broadband fully-differential low-noise amplifier

A low-noise amplifier, fully differential technology, used in low-noise amplifiers, differential amplifiers, amplifiers, etc., can solve the problems of large inductors that cannot accommodate high-frequency signals, deteriorate the noise characteristics of the input terminal, and large external inductance L, etc., to save Chip area, easy system-on-chip integration, and the effect of reducing power consumption

Inactive Publication Date: 2019-02-19
TIANJIN UNIV
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Problems solved by technology

The common gate amplifier uses the transconductance of the input tube to achieve broadband matching. The noise figure has little relationship with the operating frequency and bandwidth and is relatively flat. The circuit has excellent reverse isolation performance and high linearity, but the noise figure is high.
Another disadvantage of common-gate amplifiers is that in low-frequency appli

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  • Broadband fully-differential low-noise amplifier
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  • Broadband fully-differential low-noise amplifier

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[0046] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0047] like figure 1 As shown, the input matching stage circuit includes: a first transistor (M1), a second transistor (M2), a third transistor (M3), an eighth transistor (M8), and a ninth transistor (M9);

[0048]Wherein, the gate of the first transistor (M1) is respectively connected to the gate of the second transistor (M2) and the first end of the first resistor (R1); the gate of the eighth transistor (M8) is respectively connected to The gate of the ninth transistor (M9) is connected to the first end of the third resistor (R3);

[0049] The drain of the first transistor (M1) is respectively connected to the drain of the second transistor (M2) and the second end of the first resistor (R1); the drain of the eighth transistor (M8) is respectively conn...

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Abstract

The invention relates to a broadband fully-differential low-noise amplifier. The low-noise amplifier is characterized by including two levels consisting of an input matching level circuit and a noiseneutralizing level circuit; the input end of the input matching level circuit receives signals (IN1/IN2) of a signal input end, and generates two channels of signals which are opposite in phase; the two channels of signals are respectively output to a next level of noise neutralizing level circuit by a high-pass filter consisting of capacitors and resistors; the noise neutralizing level circuit isprovided with three input ends and three output ends on both sides, wherein one input end is connected with the output end of the input matching level circuit, and the two input ends receive signals(IN1/IN2) of a differential signal input end and then output two channels of differential signals (OUT1/OUT2).

Description

technical field [0001] The invention belongs to the technical field of radio frequency integrated circuits, and in particular relates to a 500M-1.5GHz broadband fully differential low-noise amplifier. Background technique [0002] With the development of wireless communication, the role of radio frequency receiving technology in military and civilian fields is becoming more and more important. Broadband communication system is the development trend of today's wireless communication technology, and it is also a hot spot of research at home and abroad. RF Low Noise Amplifier (LNA) is a key component in electronic countermeasures, broadband communications and broadband instruments. The signal of the LNA comes directly from the antenna. In order to achieve maximum power transmission, impedance matching is required between the LNA input and the antenna. In addition to amplifying the weak signal received from the antenna to increase the overall gain of the circuit in the radio f...

Claims

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Application Information

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IPC IPC(8): H03F1/26H03F1/56H03F3/193H03F3/45
CPCH03F1/26H03F1/56H03F3/193H03F3/45183H03F2200/294H03F2200/372H03F2203/45134
Inventor 张为李泰安
Owner TIANJIN UNIV
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