Communication terminal with low carrier feedthrough and communication system using such a terminal
First Claim
1. A terminal for use in a communication system comprising:
- a coder having an input terminal for receiving an input signal, and an output terminal for providing a coded signal;
an upconverter core having a first input terminal for receiving a first signal having predetermined spectral content at an input frequency and an output terminal for providing an output signal having substantially said predetermined spectral content at a higher frequency using a local oscillator signal having a carrier frequency;
an electrical measurement circuit having an input terminal coupled to said output terminal of said upconverter core, and a first output terminal for providing a first offset correction signal representative of a power of said output signal at said carrier frequency; and
a first summing device having a positive input terminal for receiving said coded signal, a negative input terminal coupled to said first output terminal of said electrical measurement circuit, and an output terminal coupled to said first input terminal of said upconverter core for providing said first signal.
1 Assignment
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Accused Products
Abstract
communication terminal (710) includes a coder (722, 724) receiving an input signal and having an output terminal for providing a coded signal; an upconverter core (100) having an input terminal for receiving a first signal having predetermined spectral content at an input frequency and an output terminal for providing an output signal having substantially the predetermined spectral content at a higher frequency using a local oscillator signal having a carrier frequency; an electrical measurement circuit having an input terminal coupled to the output terminal of the upconverter core (100), and an output terminal for providing a first offset correction signal representative of a power of the output signal at the carrier frequency; and a summing device (406) having a positive input terminal for receiving the coded signal, a negative input terminal coupled to the output terminal of the electrical measurement circuit, and an output terminal coupled to the input terminal of the upconverter core (100).
28 Citations
41 Claims
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1. A terminal for use in a communication system comprising:
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a coder having an input terminal for receiving an input signal, and an output terminal for providing a coded signal;
an upconverter core having a first input terminal for receiving a first signal having predetermined spectral content at an input frequency and an output terminal for providing an output signal having substantially said predetermined spectral content at a higher frequency using a local oscillator signal having a carrier frequency;
an electrical measurement circuit having an input terminal coupled to said output terminal of said upconverter core, and a first output terminal for providing a first offset correction signal representative of a power of said output signal at said carrier frequency; and
a first summing device having a positive input terminal for receiving said coded signal, a negative input terminal coupled to said first output terminal of said electrical measurement circuit, and an output terminal coupled to said first input terminal of said upconverter core for providing said first signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A terminal for use in a communication system comprising:
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means for coding an input signal to provide a coded signal;
an upconverter core having a first input terminal for receiving a first signal having predetermined spectral content at an input frequency and an output terminal for providing an output signal having substantially said predetermined spectral content at a higher frequency using a local oscillator signal having a carrier frequency;
an electrical measurement circuit having an input terminal coupled to said output terminal of said upconverter core, and a first output terminal for providing a first offset correction signal representative of a power of said output signal at said carrier frequency; and
a first summing device having a positive input terminal for receiving said coded signal, a negative input terminal coupled to said first output terminal of said electrical measurement circuit, and an output terminal coupled to said first input terminal of said upconverter core for providing said first signal. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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26. A communication system comprising:
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a plurality of terminals; and
a communication hub for being operatively coupled to said plurality of terminals;
wherein at least one of said plurality of terminals comprises;
an upconverter core having a first input terminal for receiving a first signal having predetermined spectral content at an input frequency and an output terminal for providing an output signal having substantially said predetermined spectral content at a higher frequency using a local oscillator signal having a carrier frequency;
an electrical measurement circuit having an input terminal coupled to said output terminal of said upconverter core, and a first output terminal for providing a first offset correction signal representative of a power of said output signal at said carrier frequency; and
a first summing device having a positive input terminal for receiving an input signal, a negative input terminal coupled to said first output terminal of said electrical measurement circuit, and an output terminal coupled to said first input terminal of said upconverter core for providing said first signal. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33)
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34. A method for transmitting a signal between a first terminal and a second terminal over a communication medium in a communication system comprising:
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converting a first signal having predetermined spectral content from an input frequency to a higher frequency using a local oscillator signal having a carrier frequency and providing an output signal having substantially said predetermined spectral content in response thereto;
electrically measuring a power of said output signal at said carrier frequency and providing a first offset correction signal in response thereto;
subtracting said first offset correction signal from a first input signal to provide said first signal;
transmitting said output signal to the second terminal over the communication medium; and
receiving said output signal from said communication medium at the second terminal. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41)
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Specification