Dc offset cancellation circuit
US-2017302238-A1 · Oct 19, 2017 · US
Distortion control device and method
US8995565B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8995565-B2 |
| Application number | US-30074507-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 17, 2007 |
| Priority date | May 17, 2006 |
| Publication date | Mar 31, 2015 |
| Grant date | Mar 31, 2015 |
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Abstract
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This invention includes a waveform analyzing means ( 13 ) for calculating an estimated value of a back-off value required by a power amplifier ( 2 ), which amplifies a high-frequency signal generated from a baseband signal (I, Q) to a predetermined transmission power, by analyzing the waveform of the baseband signal (I, Q), and a control means ( 14 ) for controlling at least one of the amplitude of high-frequency power input to the power amplifier ( 2 ) and the supply power of the power amplifier ( 2 ) on the basis of the estimated value. The invention calculates the estimated value of a back-off value by analyzing the waveform of a baseband in this manner, and hence need not generate a table in advance by calculating a back-off value for each combination of code channels. The invention can therefore be applied to even a case in which the number of code channels greatly increases, and can effectively prevent an increase in adjacent channel leakage power due to a signal obtained by multiplexing these code channels.
First claim
Opening claim text (preview).
The invention claimed is: 1. A distortion control device comprising: a variable gain amplifier which amplifies a high-frequency signal generated from a baseband signal that is output from a digital baseband unit according to a control signal and outputs the amplified signal to a power amplifier which amplifies the amplified signal output from the variable gain amplifier to a predetermined transmission power; a waveform analyzing unit which calculates an estimated value of a back…
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Electricity · mapped topic
Electricity · mapped topic
- H03G3/3047Primary
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
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Frequently asked questions
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- What does patent US8995565B2 cover?
- This invention includes a waveform analyzing means ( 13 ) for calculating an estimated value of a back-off value required by a power amplifier ( 2 ), which amplifies a high-frequency signal generated from a baseband signal (I, Q) to a predetermined transmission power, by analyzing the waveform of the baseband signal (I, Q), and a control means ( 14 ) for controlling at least one of the amplitud…
- Who is the assignee on this patent?
- Ichihara Masaki, Lenovo Innovations Ltd Hong Kong
- What technology area does this patent fall under?
- Primary CPC classification H03G3/3047. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Mar 31 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).