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US6130910A
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Method and apparatus for high efficiency wideband power amplification
Assignee: Motorola Solutions Inc
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Filing: 1997-11-03
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Granted: 2000-10-10
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Expires: 2017-11-03
Abstract
Abstract A method and apparatus for efficient power amplification of a wideband signal with a correspondingly wide modulation bandwidth includes an envelope detector (220), an interleaved class S modulator (270), and a power amplifier (260). The interleaved class S modulator (270) amplifies includes multiple channels (272) which each include a portion of a class S modulator. Each class S modulator has a duty cycle and time offset associated therewith. The duty cycles of the channels (272) can be the same with the time offsets different, or the duty cycles can also be different. For an interleaved class S modulator with N channels (272), the slew rate increases by as much as N, and the output ripple decreases by as much as N 2 .
Inventors
- 👤 Dale Anderson
- 👤 Pallab Midya
- 👤 Ronald Gene Myers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:14
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/02; H03F1/0205; H03F1/0211; H03F1/0216; H03F1/0222; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036; H03K; H03K7/00; H03K7/08; H03F2200/00; H03F2200/102; H03F2200/351
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
108 words
A method of amplifying an input signal, said method comprising: splitting said input signal into an envelope component and a phase component; generating an envelope signal representing amplitude information of said envelope component; creating a plurality of pulsewidth modulated signals in response to said envelope signal; combining said plurality of pulsewidth modulated signals to produce an amplified envelope signal; and receiving said phase component as an input to an amplifier stage and said amplified envelope signal as a power supply to said amplifier stage such that said phase component is remodulated and amplitude of said input signal is restored to reproduce a substantial replica of said input signal.
Claim 2
Independent Claim
108 words
A method of amplifying an input signal, said method comprising: splitting said input signal into an envelope component and a phase component; generating an envelope signal representing amplitude information of said envelope component; creating a plurality of pulsewidth modulated signals in response to said envelope signal; combining said plurality of pulsewidth modulated signals to produce an amplified envelope signal; and receiving said phase component as an input to an amplifier stage and said amplified envelope signal as a power supply to said amplifier stage such that said phase component is remodulated and amplitude of said input signal is restored to reproduce a substantial replica of said input signal.
Claim 3
Dependent Claim
37 words
The method of claim 1 wherein creating a plurality of pulsewidth modulated signals comprises: creating a first pulsewidth modulated signal having a first duty cycle; and creating a second pulsewidth modulated signal having a second duty cycle.
Claim 4
Dependent Claim
37 words
The method of claim 2 wherein said first duty cycle is proportional to a more significant portion of said input signal and said second duty cycle is proportional to a less significant portion of said input signal.
Claim 5
Dependent Claim
37 words
The method of claim 1 wherein creating a plurality of pulsewidth modulated signals comprises: creating a first pulsewidth modulated signal having a first time offset; and creating a second pulsewidth modulated signal having a second time offset.
Claim 6
Dependent Claim
18 words
The method of claim 4 wherein said first time offset and said second time offset are not equal.
Claim 7
Dependent Claim
202 words
An amplifier comprising: a divider configured to split an input signal into an amplitude path signal and a phase path signal; an detector configured to detect an envelope of said amplitude path signal and generate an envelope signal representing amplitude information; a modulator configured to receive said envelope signal and produce an amplified envelope signal, said modulator comprising: a plurality of pulsewidth modulators configured to receive said envelope signal, each of said plurality of pulsewidth modulators configured to produce a pulsewidth modulated signal having a duty cycle substantially related to an amplitude of said envelope signal; a combining network configured to combine each pulsewidth modulated signal of said plurality of pulsewidth modulators to produce a composite signal; and a filter configured to filter said composite signal and produce said amplified envelope signal; a delay element configured to delay said phase path signal in order to compensate for a delay of said amplitude path signal to produce a time delayed signal; and a power amplifier configured to receive said amplified envelope signal as a power supply such that said time delayed signal is remodulated and said envelope of said amplitude path signal is restored to reproduce a substantial replica of said input signal.
Claim 8
Dependent Claim
202 words
An amplifier comprising: a divider configured to split an input signal into an amplitude path signal and a phase path signal; an detector configured to detect an envelope of said amplitude path signal and generate an envelope signal representing amplitude information; a modulator configured to receive said envelope signal and produce an amplified envelope signal, said modulator comprising: a plurality of pulsewidth modulators configured to receive said envelope signal, each of said plurality of pulsewidth modulators configured to produce a pulsewidth modulated signal having a duty cycle substantially related to an amplitude of said envelope signal; a combining network configured to combine each pulsewidth modulated signal of said plurality of pulsewidth modulators to produce a composite signal; and a filter configured to filter said composite signal and produce said amplified envelope signal; a delay element configured to delay said phase path signal in order to compensate for a delay of said amplitude path signal to produce a time delayed signal; and a power amplifier configured to receive said amplified envelope signal as a power supply such that said time delayed signal is remodulated and said envelope of said amplitude path signal is restored to reproduce a substantial replica of said input signal.
Claim 9
Dependent Claim
43 words
The amplifier of claim 6 wherein said plurality of pulsewidth modulators is comprised of: a first pulsewidth modulator having a first duty cycle and a first time offset; and a second pulsewidth modulator having a second duty cycle and a second time offset.
Claim 10
Dependent Claim
37 words
The amplifier of claim 7 wherein said first duty cycle is proportional to a more significant portion of an input signal, and said second duty cycle is proportional to a less significant portion of said input signal.
Claim 11
Dependent Claim
18 words
The amplifier of claim 7, wherein said first time offset and said second time offset are not equal.
References Cited (Backward Citations)
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