US5697073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for shaping and power controlling a signal in a transmitter
Assignee: Motorola Solutions Inc
•
Filing: 1994-08-26
•
Granted: 1997-12-09
•
Expires: 2014-08-26
Abstract
Abstract A transmitter architecture is disclosed which offers a new combination of signal shaping and power control which optimizes transmitter noise figure performance. The disclosed apparatus and method is implemented by separating the shaping element (303) from the power control elements (406, 412, 418) in frequency. Placing the shaping element (303) at a fixed intermediate frequency (IF) allows for the use of readily available, temperature stable shaping elements while distributing the power control elements (406, 412, 418) at radio frequency (RF) facilitates optimization of noise figure performance in the transmitter (200).
Inventors
- 👤 Christopher John Daniel
- 👤 Kevin Joseph Holoubek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:02
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036; H03G3/3042; H03G3/3047
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
64 words
A transmitter for use in a communication system, the transmitter comprising: a linear multiplier utilizing input from a ROM look-up table to accordingly shape a modulated signal input at an intermediate frequency to produce a shaped modulated signal; and a set of series-coupled voltage variable attenuators, coupled to the linear multiplier, for power controlling the shaped modulated signal to a predetermined output power level.
Claim 2
Dependent Claim
64 words
A transmitter for use in a communication system, the transmitter comprising: a linear multiplier utilizing input from a ROM look-up table to accordingly shape a modulated signal input at an intermediate frequency to produce a shaped modulated signal; and a set of series-coupled voltage variable attenuators, coupled to the linear multiplier, for power controlling the shaped modulated signal to a predetermined output power level.
Claim 3
Dependent Claim
18 words
The transmitter of claim 1 wherein the communication system is a time division multiple access (TDMA) communication system.
Claim 4
Dependent Claim
20 words
The transmitter of claim 1 wherein the predetermined output power level is referenced to an output of a power amplifier.
Claim 5
Dependent Claim
83 words
A transmitter comprising: a shaping element utilizing input from a look-up table to accordingly shape a modulated signal input to produce a shaped modulated signal at IF; a mixer having as an input the shaped modulated signal at IF and having as an output a shaped modulated signal at radio frequency (RF); and a power control arrangement, including an adjustable element and having as an input the shaped modulated signal at RF and having as an output an amplified, power-controlled signal at RF.
Claim 6
Dependent Claim
83 words
A transmitter comprising: a shaping element utilizing input from a look-up table to accordingly shape a modulated signal input to produce a shaped modulated signal at IF; a mixer having as an input the shaped modulated signal at IF and having as an output a shaped modulated signal at radio frequency (RF); and a power control arrangement, including an adjustable element and having as an input the shaped modulated signal at RF and having as an output an amplified, power-controlled signal at RF.
Claim 7
Dependent Claim
19 words
The transmitter of claim 4 wherein the power control arrangement and the shaping element are independent of one another.
Claim 8
Dependent Claim
18 words
The transmitter of claim 4 wherein the look-up table further comprises a read only memory (ROM) look-up table.
Claim 9
Dependent Claim
31 words
The transmitter of claim 6 wherein the read only memory (ROM) lookup-table provides, as an output, shaping information to the shaping element based on a desired output characteristic of the transmitter.
Claim 10
Dependent Claim
23 words
The transmitter of claim 7 wherein the shaping information further comprises pre-distortion shaping information based on a desired output characteristic of the transmitter.
Claim 11
Dependent Claim
21 words
The transmitter of claim 8 wherein a desired output characteristic of the transmitter further comprises target output power of the transmitter.
Claim 12
Dependent Claim
20 words
The transmitter of claim 8 wherein a desired output characteristic of the transmitter further comprises output frequency of the transmitter.
Claim 13
Dependent Claim
23 words
The transmitter of claim 4 wherein the power control arrangement further comprises a distributed power control arrangement including a plurality of adjustable elements.
Claim 14
Dependent Claim
24 words
The transmitter of claim 11 wherein the distributed power control arrangement further comprises an adjustable coarse tune element preceding an adjustable fine tune element.
Claim 15
Dependent Claim
24 words
The transmitter of claim 11 wherein the distributed power control arrangement further comprises an adjustable fine tune element preceding an adjustable coarse tune element.
Claim 16
Independent Claim
65 words
A method comprising the steps of: shaping based on input from a look-up table to produce a shaped modulated signal at IF; mixing the shaped modulated signal at IF to produce a shaped modulated signal at RF; and power controlling, via a power control arrangement which includes an adjustable element, the shaped modulated signal at RF to produce a shaped, power controlled signal at RF.
Claim 17
Independent Claim
65 words
A method comprising the steps of: shaping based on input from a look-up table to produce a shaped modulated signal at IF; mixing the shaped modulated signal at IF to produce a shaped modulated signal at RF; and power controlling, via a power control arrangement which includes an adjustable element, the shaped modulated signal at RF to produce a shaped, power controlled signal at RF.
Claim 18
Dependent Claim
18 words
The method of claim 14 wherein the step of power controlling is independent of the step of shaping.
References Cited (Backward Citations)
US4592073A
Cited
US4706262A
Cited
US4737968A
Cited
US4956837A
Cited
US5123031A
Cited
US5121081A
Cited
US5152008A
Cited
US5101176A
Cited
US5260973A
Cited
US5179353A
Cited
US5307512A
Cited
US5287555A
Cited
US5249200A
Cited
US5159283A
Cited
US5309115A
Cited
US5410272A
Cited
US5507015A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-12-08 | 2001-06-09 | 2001-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-08 | 2005-06-09 | 2005-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-08 | 2009-06-09 | 2009-12-09 | $7700.00 | Window Closed / Lapsed |