Unlock instant, AI-driven research and patent intelligence for your innovation.

Fully differential summation amplifying circuit

A technique for amplifying circuits and amplifiers, which is applied in differential amplifiers, DC-coupled DC amplifiers, etc., and can solve problems such as large amplification factors, high noise in differential summation circuits, and large input offset voltages.

Pending Publication Date: 2021-07-13
上海传泰电子科技有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The operational amplifier adopts a closed-loop form, so a frequency compensation capacitor is required, which will lead to a decrease in the settling time and a decrease in response speed due to the limitation of the slew rate. In addition, the noise of the traditional differential summation circuit is large, and the amplification factor varies greatly with temperature. Input Large offset voltage

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
  • Fully differential summation amplifying circuit
  • Fully differential summation amplifying circuit
  • Fully differential summation amplifying circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] refer to Figure 1-Figure 2 As shown, the fully differential summation circuit includes: a negative feedback structure connected between the input and output of the second stage amplifier 3 with a resistor and the first stage composed of the first transconductance amplifier 1 and the second transconductance amplifier 2 Amplifiers, the first transconductance amplifier and the second transconductance amplifier have the same structure. This circuit is used to add and amplify the output voltages of two sets of Hall elements. The first transconductance amplifier has two input terminals, a positive input terminal of a differential signal and a negative input terminal of a differential signal, and two output terminals of a positive output terminal and a negative output terminal; the second transconductance amplifier has a positive input terminal of a differential signal and a negative input terminal of a differential signal. The input terminal has two input terminals, and has...

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 fully differential summation amplifying circuit comprises a negative feedback structure and a first-stage amplifier, the negative feedback structure comprises a second-stage amplifier, a resistor is connected between the input and the output of the second-stage amplifier in a bridging mode, and the first-stage amplifier comprises a first transconductance amplifier and a second transconductance amplifier. The transconductance amplifier adopted by the invention is an open-loop amplifier, and a frequency compensation capacitor is not needed, so that the establishment time drop caused by slew rate limitation is avoided, and the response speed is higher. According to the transconductance amplifier, an NPN triode is adopted as an input geminate transistor, offset voltage and noise can be effectively reduced, and the amplification factor of the circuit is the proportion of a constant multiplied by a resistor and is a value irrelevant to temperature, so that the amplification factor of the amplifier does not change along with the change of the temperature.

Description

Technical field: [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a fully differential summation amplifier circuit, which makes the offset small, the noise small, and the amplification factor does not change with temperature. Background technique: [0002] A transconductance amplifier is an amplifier that converts an input differential voltage into an output current. [0003] The use of transconductance amplifiers can be divided into two aspects: on the one hand, signal calculation and processing in various linear and nonlinear analog circuits; on the other hand, as an interface circuit between voltage signal variables and current mode signal processing systems , transform the voltage signal to be processed into a current signal, and then send it to the current mode system for processing. [0004] The operational amplifier is a direct-coupled amplifier with high magnification and deep negative feedback. It basically co...

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
CPCH03F3/45
Inventor 胡枭严培青赵智超
Owner 上海传泰电子科技有限公司