US4013960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quadraphase modulator
Assignee: International Telephone and Telegraph Corp
•
Filing: 1976-02-06
•
Granted: 1977-03-22
•
Expires: 1996-02-06
Abstract
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.
Inventors
- 👤 Sidney Godet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:17
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; H04L27/20; H04L27/2032; H04L27/2035; H04L27/2042; H04L27/2046
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
214 words
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.
Claim 2
Dependent Claim
214 words
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.
Claim 3
Dependent Claim
15 words
A modulator according to claim 1, wherein said first means includes a first hybrid circuit.
Claim 4
Dependent Claim
18 words
A modulator according to claim 2, wherein each of said second and third means includes a phase modulator.
Claim 5
Dependent Claim
15 words
A modulator according to claim 3, wherein said fourth means includes a four-port hybrid circuit.
Claim 6
Dependent Claim
16 words
A modulator according to claim 4, wherein said fifth means includes a fixed phase shift device.
Claim 7
Dependent Claim
38 words
A modulator according to claim 5, wherein said predetermined amount of phase shift for said phase shift device is equal to 2 tan.sup. -1 (K), where K is the voltage ratio of said first and second modulated signals.
Claim 8
Dependent Claim
15 words
A modulator according to claim 6, wherein said sixth means includes a second hybrid circuit.
Claim 9
Dependent Claim
15 words
A modulator according to claim 7, wherein said seventh means includes a hard limiting amplifier.
Claim 10
Dependent Claim
18 words
A modulator according to claim 1, wherein each of said second and third means includes a phase modulator.
Claim 11
Dependent Claim
15 words
A modulator according to claim 9, wherein said fourth means includes a four-port hybrid circuit.
Claim 12
Dependent Claim
16 words
A modulator according to claim 10, wherein said fifth means includes a fixed phase shift device.
Claim 13
Dependent Claim
38 words
A modulator according to claim 11, wherein said predetermined amount of phase shift for said phase shift device is equal to 2 tan.sup. -1 (K), where K is the voltage ratio of said first and second modulated signals.
Claim 14
Dependent Claim
14 words
A modulator according to claim 12, wherein said sixth means includes a hybrid circuit.
Claim 15
Dependent Claim
15 words
A modulator according to claim 13, wherein said seventh means includes a hard limiting amplifier.
Claim 16
Dependent Claim
15 words
A modulator according to claim 1, wherein said fourth means includes a four-port hybrid circuit.
Claim 17
Dependent Claim
16 words
A modulator according to claim 15, wherein said fifth means includes a fixed phase shift device.
Claim 18
Dependent Claim
38 words
A modulator according to claim 16, wherein said predetermined amount of phase shift for said phase shift device is equal to 2 tan.sup. -1 (K), where K is the voltage ratio of said first and second modulated signals.
Claim 19
Dependent Claim
14 words
A modulator according to claim 17, wherein said sixth means includes a hybrid circuit.
Claim 20
Dependent Claim
15 words
A modulator according to claim 18, wherein said seventh means includes a hard limiting amplifier.
Claim 21
Dependent Claim
16 words
A modulator according to claim 1, wherein said fifth means includes a fixed phase shift device.
Claim 22
Dependent Claim
38 words
A modulator according to claim 20, wherein said predetermined amount of phase shift for said phase shift device is equal to 2 tan.sup. -1 (K), where K is the voltage ratio of said first and second modulated signals.
Claim 23
Dependent Claim
14 words
A modulator according to claim 21, wherein said sixth means includes a hybrid circuit.
Claim 24
Dependent Claim
15 words
A modulator according to claim 22, wherein said seventh means includes a hard limiting amplifier.
Claim 25
Dependent Claim
37 words
A modulator according to claim 1, wherein said predetermined amount of phase shift for said fifth means is equal to 2 tan.sup. -1 (K), where K is the voltage ratio of said first and second modulated signals.
Claim 26
Dependent Claim
14 words
A modulator according to claim 24, wherein said sixth means includes a hybrid circuit.
Claim 27
Dependent Claim
15 words
A modulator according to claim 25, wherein said seventh means includes a hard limiting amplifier.
Claim 28
Dependent Claim
14 words
A modulator according to claim 1, wherein said sixth means includes a hybrid circuit.
Claim 29
Dependent Claim
15 words
A modulator according to claim 27, wherein said seventh means includes a hard limiting amplifier.
Claim 30
Dependent Claim
15 words
A modulator according to claim 1, wherein said seventh means includes a hard limiting amplifier.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |