Quadraphase modulator
First Claim
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1. A quadraphase modulator comprising:
- a first source of radio frequency carrier signal;
a second source of a first digital baseband signal;
a third source of a second digital baseband signal;
first means coupled to said first source to provide first and second radio frequency carrier signals in phase with each other;
second means coupled to said first means and said second source to phase modulate one of said first and second carrier signals by said first baseband signal to provide a first phase modulated signal;
third means coupled to said first means and said third source to phase modulate the other of said first and second carrier signals by said second baseband signal to provide a second phase modulated signal;
fourth means coupled to said second and third means to provide a difference signal from said first and second modulated signals and to provide a sum signal from said first and second modulated signals;
fifth means coupled to said fourth means to phase shift said difference signal a predetermined amount;
sixth means coupled to said fourth and fifth means responsive to said sum signal and said phase shifted difference signal to produce a quadraphase output signal; and
seventh means coupled to said sixth means to couple said quadraphase output signal to a transmitting antenna.
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Abstract
A first hybrid circuit receives a RF carrier signal and provides two equal amplitude in phase RF carrier signals each phase modulated in a different phase modulator by a different digital baseband signal. The two resultant modulated signals provide input signals to a fourport hybrid circuit. This hybrid circuit produces a difference signal and a sum signal from the two input signals. The difference signal is phase shifted a predetermined amount in a fixed phase shift device. The phase shifted difference signal and the sum signal are combined in a second hybrid circuit to provide a quadraphase output signal which is coupled to a transmitting antenna through a hard limiting amplifier.
9 Citations
29 Claims
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1. A quadraphase modulator comprising:
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a first source of radio frequency carrier signal; a second source of a first digital baseband signal; a third source of a second digital baseband signal; first means coupled to said first source to provide first and second radio frequency carrier signals in phase with each other; second means coupled to said first means and said second source to phase modulate one of said first and second carrier signals by said first baseband signal to provide a first phase modulated signal; third means coupled to said first means and said third source to phase modulate the other of said first and second carrier signals by said second baseband signal to provide a second phase modulated signal; fourth means coupled to said second and third means to provide a difference signal from said first and second modulated signals and to provide a sum signal from said first and second modulated signals; fifth means coupled to said fourth means to phase shift said difference signal a predetermined amount; sixth means coupled to said fourth and fifth means responsive to said sum signal and said phase shifted difference signal to produce a quadraphase output signal; and seventh means coupled to said sixth means to couple said quadraphase output signal to a transmitting antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification
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Current AssigneeITT Corporation (ITT, Inc.)
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Original AssigneeInternational Telephone and Telegraph Corporation
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InventorsGodet, Sidney
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Primary Examiner(s)Kominski, John
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Application NumberUS05/655,806Time in Patent Office410 DaysField of Search332/9 R, 332/9 T, 332/10, 332/21, 332/22, 332/29, 325/126, 325/139, 325/47, 325/60US Class Current332/103CPC Class CodesH04L 27/2046 in which the data are repre...
