A Cascaded Distributed Low Noise Amplifier

A low-noise amplifier and amplifier technology, applied in amplifiers, amplifier types, radio frequency amplifiers, etc., can solve the problem of inability to effectively improve the amplifier's gain-bandwidth product, and achieve the effects of simple structure, high gain, and low input return loss.

Active Publication Date: 2021-07-20
NANJING UNIV OF POSTS & TELECOMM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Commonly used broadband amplifier design techniques include negative feedback, balanced amplifiers, resistor matching, and active matching, etc., but none of these techniques can effectively improve the gain-bandwidth product of the amplifier.

Method used

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  • A Cascaded Distributed Low Noise Amplifier
  • A Cascaded Distributed Low Noise Amplifier
  • A Cascaded Distributed Low Noise Amplifier

Examples

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Embodiment Construction

[0018] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0019] The basic principle of the traditional distributed low noise amplifier is to form an artificial transmission line with the parasitic capacitance of the transistor and the inductance element, so as to overcome the gain roll-off caused by the parasitic capacitance. The circuit schematic diagram is as follows figure 1 Shown, where vdd is the supply voltage, vgs is the DC bias voltage, the on-chip inductor Lg and the input impedance of the gain unit constitute the input artificial transmission line, and the on-chip inductor Ld and the output impedance of the gain unit constitute the output artificial transmission line. Obviously, the input / output artificial transmission lines are all low-pass filter structures.

[0020] According to the principle analysis of the distributed low noise amplifier, the input and output terminals of the distributed low noise ampl...

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Abstract

The invention discloses a cascaded distributed low-noise amplifier, which includes a first-stage amplifier, a second-stage amplifier and a third-stage amplifier. The structures of the gain units are exactly the same; wherein, the on-chip inductance and the input impedance of each gain unit constitute an input artificial transmission line, and the on-chip inductance and the output impedance of each gain unit constitute an output artificial transmission line; and, the amplifiers of all stages All the gain units adopt the structure of single-ended input to differential output. The invention has simple structure, low input return loss, small in-band fluctuation, high gain and low noise figure, can overcome the limitation of the gain-bandwidth product of traditional amplifiers, obtain relatively large flat gain in a very wide frequency band, and realize good noise performance.

Description

technical field [0001] The invention relates to a cascaded distributed low noise amplifier, which belongs to the technical field of radio frequency integrated circuits. Background technique [0002] The rapid development of wireless communication technology puts forward higher requirements on the data transmission rate and bandwidth of the communication system. Commonly used broadband amplifier design techniques include negative feedback, balanced amplifiers, resistor matching, and active matching, etc., but none of these techniques can effectively improve the gain-bandwidth product of the amplifier. Due to its structural characteristics, the distributed amplifier can break through the limitation of the gain-bandwidth product of the amplifier and realize wider-band signal amplification. [0003] Monolithic microwave integrated circuits are widely used in many fields such as wireless communication, satellite communication network, millimeter wave automatic collision avoidanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/195H03F1/26H03G3/30
CPCH03F1/26H03F3/195H03F2200/451H03F2200/54H03G3/3036
Inventor 张瑛张旭李泽有耿萧
Owner NANJING UNIV OF POSTS & TELECOMM
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