Methods and apparatus for resistance compression networks
First Claim
Patent Images
1. A circuit comprising:
- first and second loads having equivalent resistances at a first frequency that vary in a substantially identical fashion over a range of at least 2;
1; and
a resistance compression network including;
an input port;
a first output port for coupling to the first load;
a second output port for coupling to the second load; and
a reactive network coupled to the first input port, the first output port, and the second output port,wherein at the first frequency an equivalent resistance of the compression network input port varies over a first ratio as equivalent resistances of the first and second loads vary together over a second ratio which is larger than the first ratio.
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Abstract
A resistance compression network substantially decreases the variation in effective resistance seen by a tuned rf inverter as loading conditions change. Circuits can include resistance compression networks and rectifiers to form rf-to-dc converters having narrow-range resistive input characteristics.
74 Citations
27 Claims
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1. A circuit comprising:
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first and second loads having equivalent resistances at a first frequency that vary in a substantially identical fashion over a range of at least 2;
1; anda resistance compression network including; an input port; a first output port for coupling to the first load; a second output port for coupling to the second load; and a reactive network coupled to the first input port, the first output port, and the second output port, wherein at the first frequency an equivalent resistance of the compression network input port varies over a first ratio as equivalent resistances of the first and second loads vary together over a second ratio which is larger than the first ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A circuit, comprising:
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an inverter circuit; a resistance compression network including an input port and first and second output ports, and a reactive network, the input port coupled to the inverter circuit; the reactive network coupled to the first input port and the first and second output ports; and a first rectifier coupled to the first output port and a second rectifier coupled to the second output port, wherein at a first frequency an equivalent resistance of the compression network input port varies over a first ratio as equivalent resistances of the first and second rectifiers vary together over a second ratio which is larger than the first ratio. - View Dependent Claims (14, 15, 16)
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17. A method, comprising:
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coupling reactive elements to form a resistance compression network, the compression network having an input port and first and second output ports, the first output port being adapted for coupling to a first load and the second output port being adapted for coupling to a second load;
wherein the first and second loads have equivalent resistances at a first frequency that vary in a substantially identical fashion over a range of at least 2;
1;wherein at a first frequency an equivalent resistance of the compression network input port varies over a first ratio as equivalent resistances of the first and second loads vary together over a second ratio which is larger than the first ratio. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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24. A circuit, comprising:
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first and second loads having equivalent resistances at a first frequency that vary in a substantially identical fashion over a range of at least 2;
1;
anda resistance compression network having an input port and first and second output ports, the first output port to drive the first load and the second output port to drive the second load, the first input port having an input impedance at the first frequency that varies a first amount as impedances of the first and second loads vary substantially together by a second amount that is greater than the first amount. - View Dependent Claims (25, 26, 27)
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Specification