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An Ultra Wideband Low Noise High Balanced On-Chip Active Balun

A low-noise, balanced chip technology, applied in the field of ultra-wideband radio frequency integrated circuits, can solve problems such as low noise figure that cannot be ultra-wideband, and achieve high balance, small noise figure, and wide bandwidth.

Active Publication Date: 2018-06-26
西安电子科技大学重庆集成电路创新研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The active baluns of these common structures occupy a small area and are easy to integrate, but they cannot have the characteristics of low noise figure and high balance in the ultra-wide frequency band

Method used

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  • An Ultra Wideband Low Noise High Balanced On-Chip Active Balun
  • An Ultra Wideband Low Noise High Balanced On-Chip Active Balun

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0022] The invention is mainly composed of an input matching network, a first-stage cascode extremely low-noise amplifier, a second-stage amplifier using a Darlington differential amplifier, and an emitter-follower between the first stage and the second stage.

[0023] The input matching network uses a π-type matching network to match the input impedance of the overall circuit to 50Ω, while considering the parasitic capacitance C of the electrostatic protection diode ESD and input pipe Q 1 and bias tube Q 3 The parasitic capacitance C π and input pipe Q 1 Parasitic resistance, so as to achieve a good match in the broadband.

[0024] The first-stage cascode very low noise amplifier can achieve broadband characteristics, by Q 1 ,Q 2 , R 1 , R 2 , L 1 ,C 1 composition, where Q 1 , Q 2 Constitute the cascode structure, R 1 、C 1 to Q 2 provides bias...

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Abstract

The invention proposes an ultra-wideband low-noise high-balance on-chip active balun, which adopts a wide-band matching network at the input end of the overall circuit to realize matching characteristics in an ultra-wide frequency band; the first-stage amplifier adopts a cascode extremely low-noise amplifier To reduce the noise figure of the overall active balun, and use the on-chip inductor at the output of the first-stage amplifier to compensate the high-frequency gain; the second-stage amplifier uses the differential amplifier of the Darlington unit, and each Darlington tube The resistance feedback technology is used between the collector and the base to ensure the stability of the Darlington tube. The tail current of the differential pair of the Darlington unit introduces a series inductor to compensate the parasitic capacitance of the tail current to improve the balance of the output differential signal; An emitter-follower is used between the first-stage amplifier and the second-stage amplifier to realize the isolation between the two stages and the shift of the DC potential. The invention has the characteristics of small noise figure, wide bandwidth and high balance.

Description

technical field [0001] The invention belongs to the field of ultra-wideband radio frequency integrated circuits, and relates to an active balun with low noise figure and high balance characteristics in ultra-wideband. Background technique [0002] Balun, also known as balanced-unbalanced converter, as a single-ended to differential converter, has a wide application in fully differential amplifiers, phase shifters and balanced mixers in communication systems. Commonly used baluns can be roughly divided into two categories: passive baluns and active baluns. Passive baluns include passive transformer structures, transmission line coupler baluns, etc., which not only occupy a large area and are not conducive to integration, but also have a large insertion loss. The commonly used structures of active baluns include CG / CS structure, cascade-cascode structure, differential pair structure, etc. The active baluns of these common structures occupy a small area and are easy to integr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H11/32
CPCH03H11/32H03F3/26
Inventor 李振荣庄奕琪权星邱芳
Owner 西安电子科技大学重庆集成电路创新研究院
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