Patent US5376895A successfully refreshed from Google Patents.
US5376895A
Expired / Lapsed
US
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Control circuit and method for transmission output
Assignee: Panasonic Holdings Corp
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Filing: 1992-11-16
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Granted: 1994-12-27
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Expires: 2012-11-16
Abstract
Abstract A control circuit for a transmission output is used in a TDMA system radio transmitter or the like and can control a transmission output burst wave stably with high accuracy over a wide range. There is provided a closed loop system in which part of the transmission output is taken out and detected to be compared with a reference voltage to control a power amplifier and an open loop system for controlling a drive amplifier connected to an input of the power amplifier, so that a wide range operation of the transmission output and multi-stage control are attained by combining controls of both the loops.
Inventors
- 👤 Yukichi Aihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:49
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036; H03G3/3042; H03G3/3047
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
162 words
A control circuit for a transmission output generated through variable output drive amplifier means, to be driven by a high-frequency signal from an oscillation source, and controllable power amplifier means cascade-connected to said drive amplifier means, said control circuit comprising: a feed back loop including detection means for detecting part of the transmission output to provide a detected output, and variable amplifier means receiving said detected output and providing an amplified detected output, a comparator means for comparing said amplified detected output with a reference signal and providing a difference output, indicating a difference between said amplified detected output and said reference signal, for controlling said power amplifier means; and a feed forward control loop including a control means for producing a first output signal to control said variable amplifier means and a second output signal to control said drive amplifier means in accordance with a control signal that represents a desired transmission output and that is input to said control means.
Claim 2
Dependent Claim
162 words
A control circuit for a transmission output generated through variable output drive amplifier means, to be driven by a high-frequency signal from an oscillation source, and controllable power amplifier means cascade-connected to said drive amplifier means, said control circuit comprising: a feed back loop including detection means for detecting part of the transmission output to provide a detected output, and variable amplifier means receiving said detected output and providing an amplified detected output, a comparator means for comparing said amplified detected output with a reference signal and providing a difference output, indicating a difference between said amplified detected output and said reference signal, for controlling said power amplifier means; and a feed forward control loop including a control means for producing a first output signal to control said variable amplifier means and a second output signal to control said drive amplifier means in accordance with a control signal that represents a desired transmission output and that is input to said control means.
Claim 3
Dependent Claim
27 words
A control circuit according to claim 1, wherein said variable amplifier means includes a variable attenuator controlled by said first control signal produced by said control means.
Claim 4
Dependent Claim
36 words
A control circuit according to claim 2, wherein said reference signal is a variable reference voltage and said control means generates said variable reference voltage in accordance with said control signal input to said control means.
Claim 5
Dependent Claim
21 words
A control circuit according to claim 1, wherein said variable amplifier means includes a high-frequency amplifier having a fixed amplification degree.
Claim 6
Dependent Claim
49 words
A control circuit according to claim 1, wherein said control means generates said second control signal to cause an output of said drive amplifier means to increase for a high power level of said transmission output as compared with that for a lower power level of said transmission output.
Claim 7
Dependent Claim
37 words
A control circuit according to claim 1, wherein said control means includes a digital circuit and a digital-to-analog converter for converting an output of said digital circuit into said first control signal and said second control signal.
Claim 8
Dependent Claim
45 words
A control circuit according to claim 1, wherein said drive amplifier means includes a plurality of cascade-connected FET amplifier circuits and an amplification degree of at least one of said FET amplifier circuits is controlled by said second control signal produced by said control means.
Claim 9
Dependent Claim
22 words
A control circuit according to claim 7, wherein a dual gate FET is used as an FET of said FET amplifier circuit.
Claim 10
Dependent Claim
81 words
A control circuit according to claim 1, wherein: said transmission output comprises a burst wave having rise and fall portions, and said control means includes means for controlling said rise and fall portions and including: a ROM that stores data for controlling said rise and fall portions, and means, including a D/A converter, for reading said data from said ROM and D/A converting said data to obtain an analog signal which is supplied to said comparator means as said reference signal.
Claim 11
Dependent Claim
67 words
A control circuit according to claim 9, wherein: said first control signal controls a gain of said variable amplifier means in correspondence with a power level of said desired transmission output, and said detected amplified output of said variable amplifier means and an output of said drive amplifier means, which is controlled by said second control signal, cooperate to control a power level of said transmission output.
Claim 12
Dependent Claim
15 words
A control circuit according to claim 1, wherein said detection means comprises a directional coupler.
Claim 13
Dependent Claim
32 words
A control circuit according to claim 1, wherein said first control signal controls a gain of said variable amplifier means in one-to-one correspondence with a power level of said desired transmission output.
Claim 14
Independent Claim
159 words
A method for controlling a transmission output, comprising the steps of: providing a transmission output by driving both a variable drive amplifier means by a high-frequency signal from an oscillation source and a power amplifier means cascade-connected to said variable drive amplifier means; effecting a feedback loop control by (i) amplifying the transmission output by a variable gain amplifier, (ii) detecting part of the amplified transmission output to obtain a detected output, (iii) comparing said detected output with a reference signal corresponding to a desired transmission output, and (iv) controlling said power amplifier means by a difference output produced by the comparing step, said difference output representing a difference between said detected output and said reference signal; and effecting feed forward control loop control including (i) controlling an output level of said drive amplifier means in correspondence with said desired transmission output and (ii) controlling a gain of said variable gain amplifier in correspondence with the desired transmission output.
Claim 15
Independent Claim
159 words
A method for controlling a transmission output, comprising the steps of: providing a transmission output by driving both a variable drive amplifier means by a high-frequency signal from an oscillation source and a power amplifier means cascade-connected to said variable drive amplifier means; effecting a feedback loop control by (i) amplifying the transmission output by a variable gain amplifier, (ii) detecting part of the amplified transmission output to obtain a detected output, (iii) comparing said detected output with a reference signal corresponding to a desired transmission output, and (iv) controlling said power amplifier means by a difference output produced by the comparing step, said difference output representing a difference between said detected output and said reference signal; and effecting feed forward control loop control including (i) controlling an output level of said drive amplifier means in correspondence with said desired transmission output and (ii) controlling a gain of said variable gain amplifier in correspondence with the desired transmission output.
Claim 16
Dependent Claim
26 words
A method according to claim 13, further comprising deriving said desired transmission output by receiving and decoding an electric wave for command from a base station.
Claim 17
Dependent Claim
19 words
A method according to claim 13, wherein said reference signal comprises a burst wave having rise and fall portions.
Claim 18
Independent Claim
147 words
A method for controlling a transmission output, comprising the steps of: providing a transmission output by driving both a variable drive amplifier means by a high-frequency signal from an oscillation source and a power amplifier means cascade-connected to said variable drive amplifier means; effecting a feedback loop control by (i) detecting part of the transmission output to obtain a detected output, (ii) comparing said detected output with a reference signal corresponding to a desired transmission output, and (iii) controlling said power amplifier means by a difference output produced by the comparing step, said difference output representing a difference between said detected output and said reference signal; and effecting feed forward control loop control of an output level of said drive amplifier means in correspondence with said desired transmission output, said method further comprising variably amplifying said detected output by an amount dependent upon said desired transmission output.
Claim 19
Independent Claim
147 words
A method for controlling a transmission output, comprising the steps of: providing a transmission output by driving both a variable drive amplifier means by a high-frequency signal from an oscillation source and a power amplifier means cascade-connected to said variable drive amplifier means; effecting a feedback loop control by (i) detecting part of the transmission output to obtain a detected output, (ii) comparing said detected output with a reference signal corresponding to a desired transmission output, and (iii) controlling said power amplifier means by a difference output produced by the comparing step, said difference output representing a difference between said detected output and said reference signal; and effecting feed forward control loop control of an output level of said drive amplifier means in correspondence with said desired transmission output, said method further comprising variably amplifying said detected output by an amount dependent upon said desired transmission output.
Claim 20
Dependent Claim
158 words
A control circuit, comprising: means for generating a transmission output by driving both a variable drive amplifier means by a high-frequency signal from an oscillation source and a power amplifier means cascade-connected to said variable drive amplifier means; means for effecting a feedback loop control by (i) amplifying the transmission output by a variable gain amplifier, (ii) detecting part of said amplified transmission output to obtain a detected output, (iii) comparing said detected output with a reference signal corresponding to a desired transmission output, and (iv) controlling said power amplifier means by a difference output produced by the comparing operation, said difference output representing a difference between said detected output and said reference signal; and means for effecting feed forward control loop control including (i) controlling an output level of said drive amplifier means in correspondence with said desired transmission output and (ii) controlling a gain of said variable gain amplifier in correspondence with said desired transmission output.
Claim 21
Dependent Claim
158 words
A control circuit, comprising: means for generating a transmission output by driving both a variable drive amplifier means by a high-frequency signal from an oscillation source and a power amplifier means cascade-connected to said variable drive amplifier means; means for effecting a feedback loop control by (i) amplifying the transmission output by a variable gain amplifier, (ii) detecting part of said amplified transmission output to obtain a detected output, (iii) comparing said detected output with a reference signal corresponding to a desired transmission output, and (iv) controlling said power amplifier means by a difference output produced by the comparing operation, said difference output representing a difference between said detected output and said reference signal; and means for effecting feed forward control loop control including (i) controlling an output level of said drive amplifier means in correspondence with said desired transmission output and (ii) controlling a gain of said variable gain amplifier in correspondence with said desired transmission output.
Claim 22
Dependent Claim
86 words
A control circuit according to claim 17, wherein: said transmission output comprises a burst wave having rise and fall portions, and said control circuit includes means for controlling said rise and fall portions and including: a ROM that stores data for controlling said rise and fall portions, and means, including a D/A converter, for reading said data from said ROM and D/A converting said data to obtain an analog signal which is supplied to said means for effecting the closed loop control as said reference signal.
Claim 23
Dependent Claim
20 words
A control circuit according to claim 17, wherein said reference signal comprises a burst wave having rise and fall portions.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-12-26 | 1998-06-27 | 1998-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-26 | 2002-06-27 | 2002-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-26 | 2006-06-27 | 2006-12-27 | $7700.00 | Window Closed / Lapsed |