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Method and apparatus for controlling the common mode impedance misbalance of an isolated sigle-ended circuit

A common-mode impedance and circuit technology, applied in the direction of amplifier input/output impedance improvement, amplifiers with semiconductor devices/discharge tubes, electrical components, etc., can solve common-mode current reduction, common-mode current imbalance, and common-mode impedance increase And other issues

Inactive Publication Date: 2002-05-15
MEDTRONIC PHYSIO CONTROL MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The proximity of the ground plane of the device to ground creates parasitic capacitance (represented by capacitor 28) and reduces common-mode current due to increased common-mode impedance
However, as in Figure 1A, the impedance of the common-mode current is unbalanced in the signal wires
This causes almost all of the common mode current to flow through resistor 24, resulting in a different voltage drop across resistors 22 and 24

Method used

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  • Method and apparatus for controlling the common mode impedance misbalance of an isolated sigle-ended circuit
  • Method and apparatus for controlling the common mode impedance misbalance of an isolated sigle-ended circuit
  • Method and apparatus for controlling the common mode impedance misbalance of an isolated sigle-ended circuit

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Embodiment approach

[0045] Figure 2A with 2B The working principle of the described embodiment is to match the discrete capacitor with the parasitic capacitance formed between the shield and the ground layer or with the internal shield. in Figure 2A In the schematic diagram 34, a physical “outer” shield 42 enclosing an “inner” physical shield 46A is provided, and the “inner” physical shield 46A itself encloses the amplifier 26. One end of the noise source 18 is coupled to a capacitor 15 representing the parasitic capacitance between the ground ground and the noise source. The other end of the noise source 18 is coupled in parallel at terminal A to one end of a resistive wire (represented by resistor 22) and one end of another resistive wire (represented by resistor 24). The other end of resistor 22 is coupled to the input of amplifier 26, and the other end of resistor 24 is coupled to the reference of amplifier 26, which is also circuit grounded. In addition, a small signal source (not shown) inse...

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PUM

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Abstract

A method and apparatus for controlling the common mode impedance misbalance of an isolated single-ended circuit for all common mode paths, thereby allowing the balancing of the common mode impedances which reduces common mode effects while maintaining the advantages of the single-ended amplifier including circuit simplicity and the reference input connected to circuit ground.

Description

Invention field [0001] The present invention relates to the field of reducing noise in circuits, and specifically relates to: by providing at least one shield for an amplifier such as a single-ended amplifier and coupling a capacitive element between this shield and the input of the amplifier, so that the input of the amplifier and any common mode A balanced impedance is established between the current loops, thereby reducing the common mode noise sensed by the amplifier. Background of the invention [0002] The quality of the output signal produced by an amplifier used to amplify small signals is very susceptible to common mode noise, because a high amplification factor is required to generate useful levels from relatively low levels of small signals. For example, if the small signal has a maximum level of 10 millivolts, the amplifier must provide 500 times amplification in order to produce a more useful 5 volt level to represent the amplified output signal of the small signal. ...

Claims

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Application Information

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IPC IPC(8): H03F3/45H03F1/56
CPCH03F2200/261H03F3/45991H03F3/45479
Inventor 丹尼尔·扬科维齐道格拉斯·K·梅德马兰德尔·J·马凯尔
Owner MEDTRONIC PHYSIO CONTROL MFG
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