Amplifier core and amplifier
US-2024204733-A1 · Jun 20, 2024 · US
Digital demodulation circuit using automatic gain control circuit having temperature compensation function
US8934858B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8934858-B2 |
| Application number | US-201213979109-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 17, 2012 |
| Priority date | Jan 17, 2011 |
| Publication date | Jan 13, 2015 |
| Grant date | Jan 13, 2015 |
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Abstract
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A digital demodulation circuit amplifies a received signal of an intermediate frequency with a variable gain control amplifier so as to convert it into a baseband signal, which is separated into a common-mode component and an orthogonal component. A first gain control voltage is generated based on the common-mode component and the orthogonal component. Additionally, a temperature correction value is generated by smoothing a pulse-width modulation signal, having a pulse width corresponding to ambient temperature, and by adding a predetermined gain and an offset thereto. A second gain control voltage is generated by adding the temperature correction value to the first gain control voltage. The variable gain control amplifier amplifies a received signal with the second gain control voltage. Thus, it is possible to achieve a temperature compensation function and an automatic gain control function in the digital demodulation circuit with a simple circuit configuration.
First claim
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The invention claimed is: 1. A digital demodulation circuit comprising: a variable gain control amplifier which amplifies a received signal of an intermediate frequency; an orthogonal demodulator which converts the received signal, amplified by the variable gain control amplifier, into a baseband signal so as to separate it into a common-mode component and an orthogonal component; an A/D converter which converts the common-mode component and the orthogonal component of the bas…
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Classifications
- H03G3/3052Primary
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
- H03D9/00Primary
Electricity · mapped topic
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Frequently asked questions
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- What does patent US8934858B2 cover?
- A digital demodulation circuit amplifies a received signal of an intermediate frequency with a variable gain control amplifier so as to convert it into a baseband signal, which is separated into a common-mode component and an orthogonal component. A first gain control voltage is generated based on the common-mode component and the orthogonal component. Additionally, a temperature correction val…
- Who is the assignee on this patent?
- Suzuki Yuuzou, Nec Corp
- What technology area does this patent fall under?
- Primary CPC classification H03G3/3052. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jan 13 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).