Patent US5532646A successfully refreshed from Google Patents.
US5532646A
Expired / Lapsed
US
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High frequency power amplifier
Assignee: Panasonic Holdings Corp
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Filing: 1994-11-14
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Granted: 1996-07-02
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Expires: 2014-11-14
Abstract
Abstract In a high frequency power amplifier reduction of current consumption at the time of power down and an improvement in distortion of linearly modulated wave at the time of generation of its maximum output are automatically effected at the same time. Part of the high frequency output of a pre-stage amplifier is derived by a directional coupler inserted in the input part of a post-stage amplifier to be superposed through a DC voltage generator circuit on a gate bias voltage applied to the gate terminal of an FET in the post-stage amplifier, so that the gate bias voltage can be automatically controlled to its optimum value according to the output level required for the power amplifier.
Inventors
- 👤 Yukichi Aihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:08
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/02; H03F1/0205; H03F1/0261; H03F1/0266; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036; H03G3/3042; H03F2200/00; H03F2200/201; H03F2200/411
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
132 words
A high frequency power amplifier comprising a plurality of amplifiers connected in cascade, each of said amplifiers including an amplifying element, and first DC voltage generator means including means for detecting an input power level to one of said plurality of amplifiers and means for generating and applying a DC voltage having a level corresponding to said input power level to an input terminal of said amplifying element of said one of said plurality of amplifiers, said first DC voltage generator means including an input coupler means for extracting a part of an input signal to said one of said plurality of amplifiers and means for converting said part of said input signal extracted by said input coupler means to said DC voltage applied to said one of said plurality of amplifiers.
Claim 2
Dependent Claim
132 words
A high frequency power amplifier comprising a plurality of amplifiers connected in cascade, each of said amplifiers including an amplifying element, and first DC voltage generator means including means for detecting an input power level to one of said plurality of amplifiers and means for generating and applying a DC voltage having a level corresponding to said input power level to an input terminal of said amplifying element of said one of said plurality of amplifiers, said first DC voltage generator means including an input coupler means for extracting a part of an input signal to said one of said plurality of amplifiers and means for converting said part of said input signal extracted by said input coupler means to said DC voltage applied to said one of said plurality of amplifiers.
Claim 3
Dependent Claim
52 words
A high frequency power amplifier according to claim 1, further comprising second DC voltage generator means for generating and applying a DC voltage to said input terminal of said amplifying element of said one of said plurality of amplifiers simultaneously with said DC voltage applied by said first DC voltage generator means.
Claim 4
Dependent Claim
70 words
A high frequency power amplifier according to claim 2, wherein said DC voltage generated by said second DC voltage generator means is constant and said DC voltage generated by said first DC voltage generator means is variable in accordance with said input power level and is superimposed on said constant DC voltage and applied to said input terminal of said amplifying element of said one of said plurality of amplifiers.
Claim 5
Dependent Claim
34 words
A high frequency power amplifier according to claim 1, wherein said first DC voltage generator means changes its output DC voltage in an analog mode in accordance with changes in said input power level.
Claim 6
Dependent Claim
34 words
A high frequency power amplifier according to claim 1, wherein said first DC voltage generator means detects said input power level at an output side of a first-stage amplifier of said plurality of amplifiers.
Claim 7
Dependent Claim
34 words
A high frequency power amplifier according to claim 1, wherein said first DC voltage generator means detects said input power level at an input side of a first-stage amplifier of said plurality of amplifiers.
Claim 8
Dependent Claim
34 words
A high frequency power amplifier according to claim 1, wherein said first DC voltage generator further comprises a lowpass filter connected between said means for converting and said one of said plurality of amplifiers.
Claim 9
Dependent Claim
17 words
A high frequency power amplifier according to claim 1, wherein said means for converting includes a diode.
Claim 10
Dependent Claim
176 words
A high frequency power amplifier comprising a plurality of amplifiers connected in cascade, each of said amplifiers including an amplifying element; first DC voltage generator means including means for detecting an input power level to said plurality of amplifiers and means for generating and applying a DC voltage having a level corresponding to said input power level to an input terminal of said amplifying element of one of said plurality of amplifiers; and second DC voltage generator means for generating and applying a DC voltage to said input terminal of said amplifying element of said one of said plurality of amplifiers simultaneously with said DC voltage applied by said first DC voltage generator means, wherein said first DC voltage generator means includes an input coupler, a DC cut capacitor, a detector circuit, a lowpass filter, a resistor and a coil and is provided at an input part of said amplifying element of said one of said plurality of amplifiers, and said one of said plurality of amplifiers is the last-stage amplifier of said plurality of amplifiers.
Claim 11
Dependent Claim
176 words
A high frequency power amplifier comprising a plurality of amplifiers connected in cascade, each of said amplifiers including an amplifying element; first DC voltage generator means including means for detecting an input power level to said plurality of amplifiers and means for generating and applying a DC voltage having a level corresponding to said input power level to an input terminal of said amplifying element of one of said plurality of amplifiers; and second DC voltage generator means for generating and applying a DC voltage to said input terminal of said amplifying element of said one of said plurality of amplifiers simultaneously with said DC voltage applied by said first DC voltage generator means, wherein said first DC voltage generator means includes an input coupler, a DC cut capacitor, a detector circuit, a lowpass filter, a resistor and a coil and is provided at an input part of said amplifying element of said one of said plurality of amplifiers, and said one of said plurality of amplifiers is the last-stage amplifier of said plurality of amplifiers.
Claim 12
Dependent Claim
17 words
A high frequency power amplifier according to claim 9, wherein said input coupler is a directional coupler.
Claim 13
Dependent Claim
24 words
A high frequency power amplifier according to claim 10, wherein said amplifying element is an FET, and said input terminal is a gate terminal.
Claim 14
Dependent Claim
51 words
A high frequency power amplifier according to claim 9, wherein said input coupler interconnects the first-stage amplifier and a later-stage amplifier of said plurality of amplifiers and said first DC voltage generator means detects said input power level by detecting a component of a signal which passes through said input coupler.
Claim 15
Dependent Claim
20 words
A high frequency power amplifier according to claim 12, wherein said component of said signal is a radio frequency component.
Claim 16
Dependent Claim
49 words
A high frequency power amplifier according to claim 9, wherein an output of said detector circuit represents said input power level and is applied to said lowpass filter and an output of said lowpass filter is provided to said amplifying element of said one of said plurality of amplifiers.
Claim 17
Dependent Claim
16 words
A high frequency power amplifier according to claim 9, wherein said detector is a detection diode.
Claim 18
Dependent Claim
17 words
A high frequency power amplifier according to claim 9, wherein said input coupler is a hybrid divider.
Claim 19
Dependent Claim
24 words
A high frequency power amplifier according to claim 16, wherein said amplifying element is an FET, and said input terminal is a gate terminal.
Claim 20
Dependent Claim
17 words
A high frequency power amplifier according to claim 9, wherein said input coupler is a resistance-type divider.
Claim 21
Dependent Claim
24 words
A high frequency power amplifier according to claim 18, wherein said amplifying element is an FET, and said input terminal is a gate terminal.
Claim 22
Dependent Claim
144 words
A high frequency power amplifier comprising a plurality of amplifiers connected in cascade, each of said amplifiers including an amplifying element, and first DC voltage generator means including means for detecting an input power level of an input signal to a first stage amplifier of said plurality of amplifiers and means for generating and applying a DC voltage having a level corresponding to said input power level to an input terminal of said amplifying element of a later stage amplifier of said plurality of amplifiers, said first DC voltage generator means including an input coupler means for extracting part of said input signal to said first stage amplifier of said plurality of amplifiers and means for converting said part of said input signal extracted by said input coupler means to said DC voltage applied to said later stage amplifier of said plurality of amplifiers.
Claim 23
Dependent Claim
144 words
A high frequency power amplifier comprising a plurality of amplifiers connected in cascade, each of said amplifiers including an amplifying element, and first DC voltage generator means including means for detecting an input power level of an input signal to a first stage amplifier of said plurality of amplifiers and means for generating and applying a DC voltage having a level corresponding to said input power level to an input terminal of said amplifying element of a later stage amplifier of said plurality of amplifiers, said first DC voltage generator means including an input coupler means for extracting part of said input signal to said first stage amplifier of said plurality of amplifiers and means for converting said part of said input signal extracted by said input coupler means to said DC voltage applied to said later stage amplifier of said plurality of amplifiers.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1999-07-02 | 2000-01-01 | 2000-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-02 | 2004-01-01 | 2004-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-02 | 2008-01-01 | 2008-07-02 | $7700.00 | Window Closed / Lapsed |