Broadband programmable gain amplifier with precise gain step size

A technology of programming gain and amplifier, applied in the direction of gain control, amplification control, electrical components, etc., can solve problems such as large difference in characteristics, wasted area, error, etc., to achieve the effect of precise gain step size

Inactive Publication Date: 2010-12-22
FUDAN UNIV
View PDF0 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the variable transconductance module 206 is in different biases when the MOS device is in the off state and the maximum transconductance state, and its characteristics are also very different.
Especially when it is close to turn-off, the MOS device is at the subthreshold, which does not satisfy the typical square ra

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Broadband programmable gain amplifier with precise gain step size
  • Broadband programmable gain amplifier with precise gain step size
  • Broadband programmable gain amplifier with precise gain step size

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Such as image 3 Shown is a structure diagram of a broadband programmable gain amplifier (300) with precise gain step size proposed by the present invention, the circuit includes: passive network attenuator (301), pre-stage fixed gain amplifier (302), active a gain controller (303), and a post-stage fixed gain amplifier (304).

[0024] Such as Figure 4 The shown passive network attenuator (301) uses exactly the same resistors to form an R-2R network, and its attenuation step size is -6.02dB / step. Then through the strobe switch, choose to output a certain level of attenuated signal. Because the latter stage is a capacitive load, the on-resistance of the MOS switch does not affect the accuracy of the attenuation at low frequencies. At high frequencies, due to the reduction of the capacitive impedance, the signal will experience greater attenuation.

[0025] A...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to the technical field of integrated circuits, in particular to a broadband programmable gain amplifier with precise gain step size. The broadband programmable gain amplifier comprises a passive attenuation network, an active gain controller and two fixed gain amplifiers. Firstly, a signal passes through the attenuation network, and the corresponding attenuation intensity isselected according to the size of an input signal to acquire a signal with moderate amplitude; the signal is amplified through a first-level fixed gain amplifier to enter the active gain controller to acquire a precise gain; and the signal is amplified through a second-level fixed gain amplifier to acquire a final signal. The active gain controller mainly consists of two connected feedback loops,and the precise gain step size is acquired through controlling the relative intensity of the two feedback loops. The invention can meet the requirements on continuous improvement of VGA gain precision and flat band width in systems, such as communication systems, disc reading systems and the like.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a high-precision variable gain amplifier. Background technique [0002] In the fields of wireless communication, disk reading, medical equipment, etc., the signal to be processed by the analog system has a large dynamic range. For example, a Code Division Multiple Access (CDMA) communication system requires a gain change of about 80dB. In order to obtain a signal with a relatively constant amplitude, an automatic gain control (AGC) loop is generally used in similar analog systems, which adjusts the gain of the link according to the amplitude of the received signal to keep the output amplitude constant. The core of the automatic gain control loop is a variable gain amplifier (VGA). The automatic gain control loop generates a control signal by comparing the output signal of the VGA with the reference signal, and controls the gain of the VGA to make the ampl...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H03G3/20
Inventor 方飞周美霞林楠谢江滨洪志良
Owner FUDAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap