Patent US5251331A successfully refreshed from Google Patents.
US5251331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High efficiency dual mode power amplifier apparatus
Assignee: Motorola Mobility LLC
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Filing: 1992-03-13
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Granted: 1993-10-05
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Expires: 2012-03-13
Abstract
Abstract The dual mode power amplifier apparatus of the present invention is comprised of a number of power amplifiers (101-103) coupled to a voltage convertor (104) through their collector supply lines. A mode select line (105) is connected to the voltage convertor (104) to select a digital or analog mode. The preferred embodiment of the present invention is used in a hybrid digital/analog radiotelephone. In the digital mode, the voltage convertor (104) is turned off and the voltage convertor (104) supply voltage is allowed through to the collectors of the power amplifiers (101-103). This permits the power amplifiers (101-103) to operate with optimum linearity in a digital transmission environment. In an analog environment, the voltage convertor (104) is on and supplying a reduced voltage to the power amplifiers (101-103) allowing more efficient operation in this mode.
Inventors
- 👤 Dale G. Schwent
- 👤 Rashid M. Osmani
- 👤 Gary M. Cristiano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:05
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036; H03G3/3042; H03G3/3047; H03G3/004
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
134 words
A dual mode power amplifier apparatus comprising: at least one amplifier having a supply input, a signal input, and an output, the amplifier generating a signal at the output that has amplified characteristics of an input signal coupled to the signal input; and a switching power supply having a mode select input, a power input, and an output, the switching power supply being off in a first mode, thereby allowing a signal at the power input to pass through to the output, and the switching power supply being on in a second mode, thereby supplying a predetermined voltage to the switching power supply output, the first and second modes being selected in response to a mode select signal coupled to the mode select input, the switching power supply output coupled to the supply input.
Claim 2
Dependent Claim
134 words
A dual mode power amplifier apparatus comprising: at least one amplifier having a supply input, a signal input, and an output, the amplifier generating a signal at the output that has amplified characteristics of an input signal coupled to the signal input; and a switching power supply having a mode select input, a power input, and an output, the switching power supply being off in a first mode, thereby allowing a signal at the power input to pass through to the output, and the switching power supply being on in a second mode, thereby supplying a predetermined voltage to the switching power supply output, the first and second modes being selected in response to a mode select signal coupled to the mode select input, the switching power supply output coupled to the supply input.
Claim 3
Dependent Claim
25 words
The dual mode power amplifier apparatus of claim 1 wherein the first mode is a digital mode and the second mode is an analog mode.
Claim 4
Dependent Claim
24 words
The dual mode power amplifier apparatus of claim 2 wherein the input signal is a constant envelope signal when the analog mode is selected.
Claim 5
Dependent Claim
24 words
The dual mode power amplifier apparatus of claim 2 wherein the input signal is a variable envelope signal when the digital mode is selected.
Claim 6
Dependent Claim
172 words
A radiotelephone comprising: a modulator that generates a modulated signal for transmission; a demodulator for demodulating a received signal; a processor for controlling the radiotelephone; and a dual mode power amplifier apparatus coupled to the modulated signal, the dual mode power amplifier comprising: at least one amplifier having a supply input, a signal input, and an output, the amplifier generating a signal at the output that has amplified characteristics of the modulated signal that is coupled to the signal input; and a switching power supply having a mode select input, a power input, and an output, the switching power supply being off in a first mode, thereby allowing a signal at the power input to pass through to the output, and the switching power supply being on in a second mode, thereby supplying a predetermined voltage to the switching power supply output, the first and second modes being selected in response to a mode select signal coupled to the mode select input, the switching power supply output coupled to the supply input.
Claim 7
Dependent Claim
172 words
A radiotelephone comprising: a modulator that generates a modulated signal for transmission; a demodulator for demodulating a received signal; a processor for controlling the radiotelephone; and a dual mode power amplifier apparatus coupled to the modulated signal, the dual mode power amplifier comprising: at least one amplifier having a supply input, a signal input, and an output, the amplifier generating a signal at the output that has amplified characteristics of the modulated signal that is coupled to the signal input; and a switching power supply having a mode select input, a power input, and an output, the switching power supply being off in a first mode, thereby allowing a signal at the power input to pass through to the output, and the switching power supply being on in a second mode, thereby supplying a predetermined voltage to the switching power supply output, the first and second modes being selected in response to a mode select signal coupled to the mode select input, the switching power supply output coupled to the supply input.
References Cited (Backward Citations)
US4870698A
Cited
US5168516A
Cited
US4994757A
Cited
US5126688A
Cited
US5060294A
Cited
US5175871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-10-04 | 1997-04-05 | 1997-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-04 | 2001-04-05 | 2001-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-04 | 2005-04-05 | 2005-10-05 | $7700.00 | Window Closed / Lapsed |