US5909643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmitter power varying device having a bypass line for a power amplifier
Assignee: Collabo Innovations Inc
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Filing: 1996-09-26
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Granted: 1999-06-01
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Expires: 2016-09-26
Abstract
Abstract A transmitter section of a mobile telephone set of a cellular telephone system includes a high-frequency signal oscillator, a modulator, a variable gain amplifier, a power amplifier, an antenna duplexer, and an antenna. Two high-frequency signal changeover switches are respectively provided upstream and downstream of the power amplifier. In transmitting a signal at a low output power, the power amplifier is turned off and the two changeover switches cause a high-frequency signal to go through a bypass line, that is, bypass the power amplifier. Thus, transmitter power control with a wide dynamic range can be attained while the power consumption is greatly reduced.
Inventors
- 👤 Yuukichi Aihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:01
CPC Classifications
H; H03; H03G; H03G1/00; H03G1/0005; H03G1/0088; H03F; H03F2203/00; H03F2203/72; H03F2203/7239; H04; H04B; H04B1/00; H04B1/02; H04B1/04; H04B2001/0408; H04B2001/0416
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
121 words
A transmitter power varying device comprising: a variable gain amplifier for amplifying a transmission signal with a variable gain; a power amplifier for amplifying the transmission signal which is to be transmitted from an antenna; a bypass line provided parallel with the power amplifier; and first and second high-frequency signal changeover switches respectively provided upstream and downstream of the power amplifier and the bypass line, for causing the transmission signal to go through the bypass line while bypassing the power amplifier in response to an output power of the transmission signal being reduced below a first threshold value; wherein the gain of the variable gain amplifier is increased to compensate for a gain reduction due to bypassing of the power amplifier.
Claim 2
Dependent Claim
121 words
A transmitter power varying device comprising: a variable gain amplifier for amplifying a transmission signal with a variable gain; a power amplifier for amplifying the transmission signal which is to be transmitted from an antenna; a bypass line provided parallel with the power amplifier; and first and second high-frequency signal changeover switches respectively provided upstream and downstream of the power amplifier and the bypass line, for causing the transmission signal to go through the bypass line while bypassing the power amplifier in response to an output power of the transmission signal being reduced below a first threshold value; wherein the gain of the variable gain amplifier is increased to compensate for a gain reduction due to bypassing of the power amplifier.
Claim 3
Dependent Claim
20 words
The transmitter power varying device according to claim 1, wherein the power amplifier is made off while it is bypassed.
Claim 4
Dependent Claim
60 words
The transmitter power varying device according to claim 1, wherein the first and second high-frequency signal changeover switches cause the transmission signal to go through the power amplifier in response to the output power of the transmission signal being increased above a second threshold value that is larger than the first threshold value, to provide a hysteretic output control characteristic.
Claim 5
Dependent Claim
20 words
The transmitter power varying device according to claim 1, further comprising an isolator that is provided in the bypass line.
Claim 6
Dependent Claim
21 words
The transmitter power varying device according to claim 1, further comprising a resistive attenuator that is provided in the bypass line.
Claim 7
Dependent Claim
74 words
The transmitter power varying device according to claim 4, further comprising a circulator that is connected to an output side of the isolator and to an output side of the power amplifier via the second high-frequency signal changeover switch, wherein the second high-frequency signal changeover switch is so constructed as to selectively connect the output side of the isolator to the output side of the power amplifier or a ground side via the circulator.
Claim 8
Dependent Claim
34 words
The transmitter power varying device according to claim 1, further comprising, upstream of the first high-frequency signal changeover switch, a cascade connection of a high-frequency signal oscillator, a modulator, and a variable gain amplifier.
Claim 9
Dependent Claim
44 words
The transmitter power varying device according to claim 1, further comprising, upstream of the first high-frequency signal changeover switch, a cascade connection of an IF signal oscillator, an IF signal modulator, an IF band variable gain amplifier, an up-converter mixer, and a RF amplifier.
Claim 10
Dependent Claim
47 words
The transmitter power varying device according to claim 1, further comprising upstream of the first high-frequency signal changeover switch, a cascade connection of an IF signal oscillator, an IF signal modulator, an IF band variable gain amplifier, an up-converter mixer, and a RF band variable gain amplifier.
Claim 11
Dependent Claim
25 words
The transmitter power varying device according to claim 1, wherein each of the first and second high-frequency signal changeover switches is a single-pole double-throw switch.
Claim 12
Dependent Claim
27 words
The transmitter power varying device according to claim 1, wherein each of the first and second high-frequency signal changeover switches is a pair of single-pole single-throw switches.
Claim 13
Dependent Claim
26 words
The transmitter power varying device according to claim 1, wherein each of the first and second high-frequency signal changeover switches is a pair of on/off switches.
Claim 14
Dependent Claim
21 words
The transmitter power varying device according to claim 1, further comprising a bandpass filter that is provided in the bypass line.
Claim 15
Dependent Claim
24 words
The transmitter power varying device according to claim 1, further comprising an isolator that is provided downstream of the second high-frequency signal changeover switch.
Claim 16
Dependent Claim
117 words
A transmitter power varying device comprising: a variable gain amplifier for amplifying a transmission signal with a variable gain; a power amplifier for amplifying the transmission signal which is to be transmitted from an antenna; a quarter-wavelength line provided parallel with the power amplifier; and a high-frequency signal changeover switch provided upstream or downstream of the power amplifier and the quarter-wavelength line, for causing the transmission signal to go through the quarter-wavelength line while bypassing the power amplifier in response to an output power of the transmission signal being reduced below a threshold value; wherein the gain of the variable gain amplifier is increased to compensate for a gain reduction due to bypassing of the power amplifier.
Claim 17
Dependent Claim
117 words
A transmitter power varying device comprising: a variable gain amplifier for amplifying a transmission signal with a variable gain; a power amplifier for amplifying the transmission signal which is to be transmitted from an antenna; a quarter-wavelength line provided parallel with the power amplifier; and a high-frequency signal changeover switch provided upstream or downstream of the power amplifier and the quarter-wavelength line, for causing the transmission signal to go through the quarter-wavelength line while bypassing the power amplifier in response to an output power of the transmission signal being reduced below a threshold value; wherein the gain of the variable gain amplifier is increased to compensate for a gain reduction due to bypassing of the power amplifier.
Claim 18
Dependent Claim
186 words
A transmitter power varying device comprising: a variable gain amplifier for amplifying a transmission signal with a variable gain; a power amplifier for amplifying the transmission signal which is to be transmitted from an antenna; a bypass line provided parallel with the power amplifier; first and second high-frequency signal changeover switches respectively provided upstream and downstream of the power amplifier and the bypass line, for causing the transmission signal to go through the bypass line while bypassing the power amplifier, reducing a power of the transmission signal below a first threshold value; an isolator provided in the bypass line; and a circulator that is connected to an output side of the isolator and to an output side of the power amplifier via the second high-frequency signal changeover switch, wherein the second high-frequency signal changeover switch is so constructed as to selectively connect the output side of the isolator to the output side of the power amplifier or a ground side via the circulator; wherein the gain of the variable gain amplifier is increased to compensate for a gain reduction due to bypassing of the power amplifier.
Claim 19
Dependent Claim
186 words
A transmitter power varying device comprising: a variable gain amplifier for amplifying a transmission signal with a variable gain; a power amplifier for amplifying the transmission signal which is to be transmitted from an antenna; a bypass line provided parallel with the power amplifier; first and second high-frequency signal changeover switches respectively provided upstream and downstream of the power amplifier and the bypass line, for causing the transmission signal to go through the bypass line while bypassing the power amplifier, reducing a power of the transmission signal below a first threshold value; an isolator provided in the bypass line; and a circulator that is connected to an output side of the isolator and to an output side of the power amplifier via the second high-frequency signal changeover switch, wherein the second high-frequency signal changeover switch is so constructed as to selectively connect the output side of the isolator to the output side of the power amplifier or a ground side via the circulator; wherein the gain of the variable gain amplifier is increased to compensate for a gain reduction due to bypassing of the power amplifier.
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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) | 2002-05-31 | 2002-11-30 | 2003-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-05-31 | 2006-11-30 | 2007-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-05-31 | 2010-11-30 | 2011-06-01 | $7700.00 | Window Closed / Lapsed |