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Broadband low-phase-error variable gain amplifier adopting degenerated inductance technology

A technology of gain amplifier and degenerated inductance, which is applied to amplifiers with semiconductor devices/discharge tubes, amplifiers, improved amplifiers to expand bandwidth, etc., to achieve the effect of small gain sacrifice, no influence on input matching, wideband and low phase error

Pending Publication Date: 2022-05-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Recently, with the increasing demand for Gb / s-level high data rate applications, circuit design engineers have developed wideband VGAs with various structures, but how to achieve low phase error gain adjustment in a wide frequency range is still a problem that needs to be solved. big problem

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  • Broadband low-phase-error variable gain amplifier adopting degenerated inductance technology
  • Broadband low-phase-error variable gain amplifier adopting degenerated inductance technology
  • Broadband low-phase-error variable gain amplifier adopting degenerated inductance technology

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0025] This embodiment provides a 150-170GHz broadband low phase error variable gain amplifier using degenerated inductance technology, and its circuit structure is as follows figure 1 As shown, it consists of four variable gain amplifier unit circuits cascaded in sequence; each variable gain amplifier unit circuit is a current-steering cascode structure, specifically as figure 2 As shown, the core part consists of two common base tubes Q 2 , Q 3 and a cascode tube Q 1 constitute, where the common emitter Q 1 The base of the T-type input matching network is connected to the end of the input matching network: MTL 2 Connected to base, MTL 1 A DC blocking capacitor C is connected to the previous circuit DC 、MTL 3 with bias voltage V bias1 Indirect DC bypass capacitor C VDD , common emitter Q 1 The transmitter is grounded; the common ba...

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Abstract

The invention belongs to the field of radio frequency integrated circuits, and particularly provides a 150-170GHz broadband low-phase-error variable gain amplifier adopting a degenerated inductance technology, which is used for effectively reducing the phase error between different gain gears and effectively expanding the bandwidth at the same time. The variable gain amplifier is composed of four variable gain amplifier unit circuits which are cascaded in sequence, each variable gain amplifier unit circuit introduces a phase compensation inductor MTL at an intermediate node of a common base tube and a common emitter tube on the basis of a current steering type cascade structure, and by designing the inductance value (MTLN or MTLP) of the phase compensation inductor MTL, the gain of the variable gain amplifier unit circuit is improved. The front two-stage unit circuit and the rear two-stage unit circuit realize different gain-phase characteristics (reverse conversion or synchronous conversion); and finally, phase offset is realized through cascade connection of four stages of unit circuits, namely, the phase error is effectively reduced, and the broadband low-phase-error variable gain amplifier is realized.

Description

technical field [0001] The invention belongs to the field of radio frequency integrated circuits, relates to a variable gain amplifier (VGA), and specifically provides a 150-170 GHz broadband low phase error variable gain amplifier using degenerated inductance technology. Background technique [0002] The millimeter wave band (30-300GHz) has abundant spectrum resources, which can provide the required frequency for 5G. With the continuous development of process technology and the improvement of transistor performance, people have been actively researching millimeter wave ( mm-wave) frequency band circuit structure and design technology. [0003] Among various types of circuit blocks, variable gain amplifiers (VGAs) control the transconductance, resulting in a change in gain, and play an important role in various mmWave band applications. For example, VGAs are used in beamforming or beamforming systems to reduce gain errors and sidelobe levels; VGAs are used in dynamic polari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/08H03F1/14H03F1/42H03F3/195
CPCH03F1/08H03F1/14H03F1/42H03F3/195Y02D30/70
Inventor 王政杨茂旋谢倩
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA