US4581595A
Expired / Lapsed
US
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Phase shift network with minimum amplitude ripple
Assignee: Boeing North American Inc
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Filing: 1984-05-30
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Granted: 1986-04-08
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Expires: 2004-05-30
Abstract
Abstract An improved phase shift network is disclosed which is applicable to broadband systems, particularly in connection with feedforward power amplifier systems. The phase shift network includes a splitter for receiving an input signal and providing outputs which are coupled through all pass networks to produce signals differing in phase by a predetermined angle. The signals from the all pass networks are coupled through variable attenuators having their outputs recombined in a combiner to produce an output representing the input signal phase shifted by a predetermined angle. The phase shift may be adjusted by changing only one variable attenuator at a time to produce phase shifts of 90° or greater.
Inventors
- 👤 Edward G. Silagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:44
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/18; H03H7/20; H03F; H03F1/00; H03F1/32; H03F1/3223; H03F1/3229
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
190 words
A phase shift system comprising: means for receiving an input signal; means responsive to said input signal for splitting said signal to form first and second signal paths; means coupled to said first signal path for providing a first signal having a reference phase angle; means coupled to said second signal path for providing a second signal having a phase differing from the reference phase angle of said first signal by an angle α wherein α is greater than 90°; means for variably attenuating said first signal to provide a first attenuated signal; means for variably attenuating said second signal for providing a second attenuated signal; and means for combining said first and second attenuated signals to produce an output signal representing the input signal phase shifted by a predetermined angle; said means for providing a second signal defining said angle α such that each of said means for variably attenuating is adjustable separate from the other and each controls a portion of the phase shift of the output signal over an angle from 0° to θ, where θ is the maximum phase shift produced by the phase shift system.
Claim 2
Dependent Claim
190 words
A phase shift system comprising: means for receiving an input signal; means responsive to said input signal for splitting said signal to form first and second signal paths; means coupled to said first signal path for providing a first signal having a reference phase angle; means coupled to said second signal path for providing a second signal having a phase differing from the reference phase angle of said first signal by an angle α wherein α is greater than 90°; means for variably attenuating said first signal to provide a first attenuated signal; means for variably attenuating said second signal for providing a second attenuated signal; and means for combining said first and second attenuated signals to produce an output signal representing the input signal phase shifted by a predetermined angle; said means for providing a second signal defining said angle α such that each of said means for variably attenuating is adjustable separate from the other and each controls a portion of the phase shift of the output signal over an angle from 0° to θ, where θ is the maximum phase shift produced by the phase shift system.
Claim 3
Dependent Claim
11 words
The system of claim 1 wherein α is equal to 180°-θ/2.
Claim 4
Dependent Claim
18 words
The system of claim 1 wherein said means for providing said first and second signals are all-pass networks.
Claim 5
Dependent Claim
15 words
The system of claim 1 wherein said means for splitting is a 3 dB splitter.
Claim 6
Dependent Claim
227 words
In a feedforward system constructed and arranged to provide feedforward error correction of an amplified output signal wherein said feedforward system includes a phase shift network to allow phase equalization in said feedforward system, the improvement in said phase shift network comprising: means for receiving an input signal; means responsive to said input signal for splitting said signal to form first and second signal paths; means coupled to said first signal path for providing a first signal having a reference phase angle; means coupled to said second signal path for providing a second signal having a phase differing from said phase reference angle of said first signal by an angle α wherein α is greater than 90°; means for variably attenuating said first signal to provide a first attenuated signal; means for variably attenuating said second signal for providing a second attenuated signal; and means for combining said first and second attenuated signals to produce an output signal representing the input signal phase shifted by a predetermined angle; said means for providing a second signal defining said angle α such that each of said means for variably attenuating is adjustable separate from the other and each controls a portion of the phase shift of the output signal over an angle from 0° to θ, where θ is the maximum phase shift produced by the phase shift network.
Claim 7
Dependent Claim
227 words
In a feedforward system constructed and arranged to provide feedforward error correction of an amplified output signal wherein said feedforward system includes a phase shift network to allow phase equalization in said feedforward system, the improvement in said phase shift network comprising: means for receiving an input signal; means responsive to said input signal for splitting said signal to form first and second signal paths; means coupled to said first signal path for providing a first signal having a reference phase angle; means coupled to said second signal path for providing a second signal having a phase differing from said phase reference angle of said first signal by an angle α wherein α is greater than 90°; means for variably attenuating said first signal to provide a first attenuated signal; means for variably attenuating said second signal for providing a second attenuated signal; and means for combining said first and second attenuated signals to produce an output signal representing the input signal phase shifted by a predetermined angle; said means for providing a second signal defining said angle α such that each of said means for variably attenuating is adjustable separate from the other and each controls a portion of the phase shift of the output signal over an angle from 0° to θ, where θ is the maximum phase shift produced by the phase shift network.
Claim 8
Dependent Claim
18 words
The system of claim 5 wherein said means for providing said first and second signals are all-pass networks.
Claim 9
Dependent Claim
15 words
The system of claim 5 wherein said means for splitting is a 3 dB splitter.
Claim 10
Dependent Claim
66 words
The system of claim 1 or 5 wherein said angle α is fixed by said means for providing said second signal such that said means for variably attenuating said first signal causes a phase shift in the input signal over a range of 0°-θ/2 and said means for variably attenuating said second signal causes a phase shift of the input signal over a range of θ/2-θ.
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) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |