Patent US3650360A successfully refreshed from Google Patents.
Patent US1877982A successfully refreshed from Google Patents.
Patent US7260157B2 successfully refreshed from Google Patents.
US7260157B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase shifted transmitter architecture for communication systems
Assignee: Individual
•
Filing: 2002-11-21
•
Granted: 2007-08-21
•
Expires: 2022-11-21
Abstract
Abstract The phase shifted (PS) transmitter provides substantially linear amplification from two non-linear amplifiers by decomposing the original signal into two constant envelope signals with varying phases. The generation of the two constant envelope signals does not require the use of a signal component separator (SCS) or a reference signal generator. The phase shifted transmitter generates directly the required constant envelope, varying phase signals. This eliminates stringent requirements on the circuitry and allows the use of non-linear highly efficient power amplifiers in the transmitter. When the two above mentioned signals are combined, they constructively and destructively interfere to re-form an amplified form of the original signal, which is to be transmitted via an antenna.
Inventors
- 👤 Sotoudeh Hamedi Hagh
- 👤 C. Andre T. Salama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:52
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/02; H03F1/0205; H03F1/0294; H04; H04L; H04L27/00; H04L27/32; H04L27/34; H04L27/36; H04L27/362
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
181 words
A method of improving the signal linearity, power efficiency, and frequency bandwidth of a communication system transmitter, comprising the steps of: (a) utilizing a baseband operation to generate at least first and second voltages which are in conformity with an input transmission signal; (b) using said first and second voltages in phase shifters to generate respective first and second component signals having substantially constant envelopes and varying phases; (c) amplifying said first and second component signals separately using power efficient methods; and (d) combining said first and second component signals following amplification using wideband methods to produce an output signal in proportion to the input transmission signal; wherein using phase shifters to generate the first and second component signals comprises: (i) using at least one LC network, consisting of at least one inductor and one capacitor, implementing a quarter-wavelength transmission line; (ii) cascading an even number of said quarter-wavelength transmission lines to implement the delay lines of a phase shifter; and (iii) replacing capacitors of the delay lines with varactors whose capacitance change by applying the said first and second voltages.
Claim 2
Independent Claim
181 words
A method of improving the signal linearity, power efficiency, and frequency bandwidth of a communication system transmitter, comprising the steps of: (a) utilizing a baseband operation to generate at least first and second voltages which are in conformity with an input transmission signal; (b) using said first and second voltages in phase shifters to generate respective first and second component signals having substantially constant envelopes and varying phases; (c) amplifying said first and second component signals separately using power efficient methods; and (d) combining said first and second component signals following amplification using wideband methods to produce an output signal in proportion to the input transmission signal; wherein using phase shifters to generate the first and second component signals comprises: (i) using at least one LC network, consisting of at least one inductor and one capacitor, implementing a quarter-wavelength transmission line; (ii) cascading an even number of said quarter-wavelength transmission lines to implement the delay lines of a phase shifter; and (iii) replacing capacitors of the delay lines with varactors whose capacitance change by applying the said first and second voltages.
Claim 3
Independent Claim
173 words
A system for improving the linearity and efficiency of a communication system transmitter, comprising: (a) means to generate at least first and second voltages which are in conformity with an input transmission signal; (b) means to utilize said first and second voltages at phase shifters to generate respective first and second component signals having substantially constant envelopes and varying phases; (c) means to amplify said first and second component signals separately using individual non-linear amplifiers; (d) means to absorb large parasitic output capacitors of each amplifying transistor into a corresponding matching network and hence increase the power efficiency of the non-linear amplifiers; and (e) means to combine said first and second component signals following amplification to produce an output signal in proportion to the input transmission signal; wherein each matching network of step (d) is implemented by using 2K+1 cascades of quarter wavelength transmission lines, where K is an integer ≧1, with characteristic impedances varying from low impedances seen at the output of the power amplifier towards high impedances seen at the antenna.
Claim 4
Independent Claim
173 words
A system for improving the linearity and efficiency of a communication system transmitter, comprising: (a) means to generate at least first and second voltages which are in conformity with an input transmission signal; (b) means to utilize said first and second voltages at phase shifters to generate respective first and second component signals having substantially constant envelopes and varying phases; (c) means to amplify said first and second component signals separately using individual non-linear amplifiers; (d) means to absorb large parasitic output capacitors of each amplifying transistor into a corresponding matching network and hence increase the power efficiency of the non-linear amplifiers; and (e) means to combine said first and second component signals following amplification to produce an output signal in proportion to the input transmission signal; wherein each matching network of step (d) is implemented by using 2K+1 cascades of quarter wavelength transmission lines, where K is an integer ≧1, with characteristic impedances varying from low impedances seen at the output of the power amplifier towards high impedances seen at the antenna.
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) | 2010-08-20 | 2011-02-19 | 2011-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2014-08-20 | 2015-02-19 | 2015-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2018-08-20 | 2019-02-19 | 2019-08-21 | $7700.00 | Window Closed / Lapsed |