Programmable fully-differential gain-bootstrap operational transconductance amplifier

A transconductance amplifier, fully differential technology, used in differential amplifiers, DC-coupled DC amplifiers, etc., can solve the problem of low power consumption efficiency, single-stage sleeve/folding amplifier open-loop gain is not large enough, single-stage gain bootstrap Amplifier bandwidth is small and other problems, to achieve the effect of increasing the input range

Active Publication Date: 2014-12-24
XIDIAN UNIV
View PDF1 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the open-loop gain of the single-stage sleeve / folding amplifier is not large enough to meet the accuracy requirements of the pipeline; while in the two-stage Miller compensation amplifier, a considerable part of the power consumption is used for frequency compensation, and the power consumption efficiency is low; Therefore, a single-stage gain bootstrap amplifier is generally used to achieve high gain
[0004] However, the existing single-stage gain bootstrap amplifier technology has at least the following problems: the bandwidth of the single-stage gain bootstrap amplifier is small, which cannot meet the requirements of the current high-speed analog-to-digital converter structure for the amplifier speed; and the general single-stage gain bootstrap amplifier It only has a fixed bandwidth, and it is difficult to meet different speed and stability requirements for complex application environments and processes, temperature, and power supply deviations; at the same time, the single-stage gain bootstrap amplifier also has problems such as a small input range and large input parasitic capacitance. The disadvantages of deteriorating the performance of data converters; these problems limit the application of CMOS (Complementary Metal Oxide Semiconductor) single-stage gain bootstrap amplifiers in high-speed and high-precision analog-to-digital converters

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
  • Programmable fully-differential gain-bootstrap operational transconductance amplifier
  • Programmable fully-differential gain-bootstrap operational transconductance amplifier
  • Programmable fully-differential gain-bootstrap operational transconductance amplifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0069] According to a specific implementation manner, the non-inverting output terminal of the pre-amplifier circuit is connected to the non-inverting input end of the rear-stage telescopic gain bootstrap amplifier circuit; the inverting output terminal of the pre-amplifier circuit The end is connected with the inverting input end of the rear-stage telescopic gain bootstrap amplifier circuit;

[0070] The non-phase output terminal of the post-stage telescopic gain bootstrap amplifier circuit and the positive-phase signal load to be driven by the programmable full differential gain bootstrap transconductance amplifier and the non-phase output detection of the output common-mode feedback circuit terminal connection; the inverting output terminal of the post-stage sleeve type gain bootstrap amplifier circuit is connected with the inverting signal load to be driven by the programmable fully differential gain bootstrap transconductance amplifier and the output common-mode feedback c...

specific Embodiment approach

[0074] Such as figure 2 As shown, according to a specific implementation manner, the pre-amplification circuit includes:

[0075] a first bias current source 21, configured to provide a bias current;

[0076] The positive input transistor MN1, the gate is connected to the positive input voltage Vip, the source is connected to the ground terminal GND of the bias current source 21, the drain is connected to the high-level output terminal VDD of the driving power supply through the positive variable load network 221, and the source Extremely the inverting output terminal VN of the pre-amplification circuit;

[0077] Negative input transistor MN2, the gate is connected to the negative input voltage Vin, the source is connected to the ground terminal GND of the bias current source 21, the drain is connected to the high-level output terminal VDD of the driving power supply through the negative variable load network 222, and the source It is the positive phase output terminal VP o...

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 provides a programmable fully-differential gain-bootstrap operational transconductance amplifier comprising a front-arranged pre-amplifying circuit, a rear sleeve-type gain-bootstrap amplifying circuit, a bandwidth programming circuit and an output common mode feedback circuit. The front-arranged pre-amplifying circuit is used for amplifying differential input signals and outputting pre-amplified differential input signals; the rear sleeve-type gain-bootstrap amplifying circuit is used for amplifying output signals of the front-arranged pre-amplifying circuit to form differential output signals; the bandwidth programming circuit is used for adjusting the bandwidths of the front-arranged pre-amplifying circuit and rear sleeve-type gain-bootstrap amplifying circuit according to programming control signals input externally; the output common mode feedback circuit is used for inputting common mode feedback signals to the rear sleeve-type gain-bootstrap amplifying circuit according to the differential output signals to allow the rear sleeve-type gain-bootstrap amplifying circuit to output different output signals of common mode levels in a predetermined range; the amplification multiple of the front-arranged pre-amplifying circuit is smaller than that of the rear sleeve-type gain-bootstrap amplifying circuit. The programmable fully-differential gain-bootstrap operational transconductance amplifier is capable of increasing the bandwidths and has the function of programming and adjusting the bandwidths.

Description

technical field [0001] The invention relates to a programmable fully differential transconductance amplifier, in particular to a fully differential gain bootstrap transconductance amplifier with a programmable bandwidth function. Background technique [0002] The transconductance amplifier is a functional module that converts the input differential voltage signal into a current signal, and charges and discharges the capacitive load to realize the input-to-output voltage method. The amplifier is an important constituent unit of the pipeline A / D (analog / digital) converter, and its performance has an important influence on the pipeline A / D converter. With the development of the pipeline A / D converter towards high speed and high precision, the requirements for its internal sub-circuits, especially the gain and bandwidth of the amplifier are getting higher and higher. In the MDAC (multiplicative digital-to-analog converter) of the pipeline A / D converter, multiple internal compar...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45
Inventor 朱樟明陈雨薛婷丁瑞雪杨银堂
Owner XIDIAN 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