Distortion generation in balanced and unbalanced signals

Details Distortion generation in balanced and unbalanced signals Distortion generation in balanced and unbalanced signals

2001-06-29

2004-02-10

Nguyen, Khanh Van (Department: 2817)

Amplifiers

Hum or noise or distortion bucking introduced into signal...

C330S301000

Reexamination Certificate

active

06690235

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to generation of distortion in an electrical signal line system.
2. Related Art
A nonlinear power amplifier that amplifies an input electrical signal adds undesired distortion components to the signal, and the output signal from the power amplifier includes such distortion components.
There is a need for a method and structure that enables the output signal from the power amplifier to be free of signal distortion or to have a reduced level of signal distortion.
SUMMARY OF THE INVENTION
The present invention provides an electrical structure, comprising a signal distortion generator that is configured to receive a pair of balanced input currents +X and −X each having a same angular frequency &ohgr;, and to generate a pair of output currents +X+&Dgr;X
1
and −X+&Dgr;X
2
, wherein &Dgr;X
1
−&Dgr;X
2
=G
2
X
2
+G
3
X
3
, wherein G
2
and G
3
are each independent of X, and wherein at least one of G
2
and G
3
is nonzero.
The present invention provides a method for forming an electrical structure, comprising providing a signal distortion generator that is configured to receive a pair of balanced input currents +X and −X each having a same angular frequency &ohgr;, and to generate a pair of output currents +X+&Dgr;X
1
and −X+&Dgr;X
2
, wherein &Dgr;X
1
−&Dgr;X
2
=G
2
X
2
+G
3
X
3
, wherein G
2
and G
3
are each independent of X, and wherein at least one of G
2
and G
3
is nonzero.
The present invention provides a method for generating signal distortion, comprising:
providing a signal distortion generator (SDG) that is configured to receive a pair of balanced input currents +X and −X each having a same angular frequency &ohgr;, and to generate a pair of output currents +X+&Dgr;X
1
and −X+&Dgr;X
2
, wherein &Dgr;X
1
−&Dgr;X
2
=G
2
X
2
+G
3
X
3
, wherein G
2
and G
3
are each independent of X, and wherein at least one of G
2
and G
3
is nonzero;
providing the pair of balanced input currents;
receiving by the SDG the pair of balanced input currents; and
generating by the SDG the pair of output currents.
The present invention provides an electrical structure, comprising a Type 3 signal distortion generator (SDG) that is configured to receive an unbalanced input current P having an angular frequency &ohgr;, and to generate an output current U
OUT
of a form P+(&agr;P+&bgr;P
2
+&ggr;P
3
)/2, wherein &agr;, &bgr;, and &ggr; are each nonzero and each independent of P, and wherein the SDG includes a distortion path (DP) that has an input impedance ratio of at least 5 and an output impedance ratio of at least 5.
The present invention provides a method for forming an electrical structure, comprising providing a Type 3 signal distortion generator (SDG) that is configured to receive an unbalanced input current P having an angular frequency &ohgr;, and to generate an output current U
OUT
of a form p+(&agr;P+&bgr;P
2
+&ggr;P
3
)/2, wherein &agr;, &bgr;, and &ggr; are each nonzero and each independent of P, and wherein the SDG includes a distortion path (DP) that has an input impedance ratio of at least 5 and an output impedance ratio of at least 5.
The present invention provides a method for generating signal distortion, comprising:
providing a Type 3 signal distortion generator (SDG) that is configured to receive an unbalanced input current P having an angular frequency &ohgr;, and to generate an output current U
OUT
of a form P+(&agr;P+&bgr;P
2
+&ggr;P
3
)/2, wherein &agr;, &bgr;, and &ggr; are each nonzero and each independent of P, and wherein the SDG includes a distortion path (DP) that has an input impedance ratio of at least 5 and an output impedance ratio of at least 5;
providing the unbalanced input current P;
receiving by the SDG the unbalanced input current P; and
generating by the SDG the output current U
OUT
.
The present invention provides a method and structure that enables the output signal from the power amplifier to be free of signal distortion or to have a reduced level of signal distortion.


REFERENCES:
patent: 5252930 (1993-10-01), Blauvelt
patent: 6054896 (2000-04-01), Wright et al.

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