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: 2004-12-01
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

[0043] Figure 2A and 2B The described embodiment works by matching the discrete capacitors to the parasitic capacitance formed between the shield and the ground plane or with the internal shield. exist Figure 2A 34 is provided with a physical "outer" shield 42 enclosing an "inner" physical shield 46A, which in turn encloses amplifier 26. One end of a noise source 18 is coupled to a capacitor 15 representing a parasitic capacitance between ground ground and the noise source. The other end of noise source 18 is coupled in parallel at terminal A to one end of a resistive lead (represented by resistor 22 ) and one end of another resistive lead (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 reference is also circuit ground. Additionally, a small signal for amplification is provided by a small signal source (not shown) interposed between resis...

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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

field of invention [0001] The present invention relates to the field of noise reduction in electrical circuits, and in particular to the separation between the input of the amplifier and any common-mode A balanced impedance is established between the current loops, thereby reducing 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, since high amplification factors are required to produce useful levels from the relatively low levels of small signals. For example, if a small signal has a maximum level of 10 millivolts, the amplifier must provide 500 times the amplification in order to produce a more useful 5 volt level for representing the amplified output signal of the small signal. [0003] Common-mode noise is often the dominant source of noise in the output signal produced by a small-signal input amplifier being amp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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