Mixer of a near field communication (NFC) receiver device supporting single-ended and differential inputs
US-9960735-B1 · May 1, 2018 · US
Contactless communication device with differential receiver input voltage stabilization
US10291291B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10291291-B2 |
| Application number | US-201715646955-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 11, 2017 |
| Priority date | Jul 11, 2017 |
| Publication date | May 14, 2019 |
| Grant date | May 14, 2019 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
A contactless communication device includes a receiver unit having differential input terminals for connecting to an antenna. The receiver unit is coupled to a transmitting device and receives an RF signal transmitted by the transmitting device. A first comparator is adapted to generate a first comparator output signal indicative of a relationship between a voltage at a positive input terminal of the receiver unit and a first reference voltage. A second comparator is adapted to generate a second comparator output signal indicative of a relationship between a voltage at a negative input terminal of the receiver unit and a second reference voltage. A first voltage regulation circuit is adapted to regulate the voltage at the positive input terminal in response to the first comparator output signal. A second voltage regulation circuit is adapted to regulate the voltage at the negative input terminal in response to the second comparator output signal.
First claim
Opening claim text (preview).
What is claimed is: 1. A contactless communication device comprising: a receiver unit having differential input terminals for connecting to an antenna, said differential input terminals of the receiver unit including a positive input terminal and a negative input terminal; a first comparator adapted to generate a first comparator output signal indicative of a relationship between a voltage at the positive input terminal of the receiver unit and a first reference voltage; a second comparator adapted to generate a second comparator output signal indicative of a relationship between a voltage at the negative input terminal of the receiver unit and a second reference voltage; a first voltage regulation circuit coupled to the first comparator and to the positive input terminal of the receiver unit, the first voltage regulation circuit being adapted to regulate the voltage at the positive input terminal in response to the first comparator output signal; and a second voltage regulation circuit coupled to the second comparator and to the negative input terminal of the receiver unit, the second voltage regulation circuit being adapted to regulate the voltage at the negative input terminal in response to the second comparator output signal. 2. The contactless communication device of claim 1 , wherein the first voltage regulation circuit is adapted to regulate an amplitude and a phase of the voltage at the positive input terminal of the receiver unit; and wherein the second voltage regulation circuit is adapted to regulate an amplitude and a phase of the voltage at the negative input terminal of the receiver unit. 3. The contactless communication device of claim 1 , wherein the first voltage regulation circuit is adapted to regulate an amplitude of the voltage at the positive input terminal of the receiver unit; and wherein the second voltage regulation circuit is adapted to regulate an amplitude of the voltage at the negative input terminal of the receiver unit. 4. The contactless communication device of claim 1 , wherein the first voltage regulation circuit comprises a controller and a first programmable attenuator connected to the positive input terminal of the receiver unit; and wherein the second voltage regulation circuit comprises the controller and a second programmable attenuator connected to the negative input terminal of the receiver unit. 5. The contactless communication device of claim 4 , wherein the first programmable attenuator includes a first M-bit controlled resistor array and a first N-bit controlled capacitor array, the first M-bit controlled resistor array being adapted to regulate an amplitude of the voltage at the positive input terminal of the receiver unit, the first N-bit controlled capacitor array being adapted to regulate a phase of the voltage at the positive input terminal of the receiver unit; and wherein the second programmable attenuator includes a second M-bit controlled resistor array and a second N-bit controlled capacitor array, the second M-bit controlled resistor array being adapted to regulate an amplitude of the voltage at the negative input terminal of the receiver unit, the second N-bit controlled capacitor array being adapted to regulate a phase of the voltage at the negative input terminal of the receiver unit. 6. The contactless communication device of claim 4 , wherein the first programmable attenuator includes a first M-bit controlled resistor array, the first M-bit controlled resistor array being adapted to regulate an amplitude of the voltage at the positive input terminal of the receiver unit; and wherein the second programmable attenuator includes a second M-bit controlled resistor array, the second M-bit controlled resistor array being adapted to regulate an amplitude of the voltage at the negative input terminal of the receiver unit. 7. The contactless communication device of claim 1 , wherein said device is incorporated in a mobile device and adapted to be powered by the mobile device. 8. A contactless communication device comprising: a receiver unit having differential input terminals for connecting to an antenna, said differential input terminals of the receiver unit including a positive input terminal and a negative input terminal; a comparator adapted to generate a comparator output signal indicative of a relationship between a voltage at a selected one of the positive input terminal and the negative input terminal of the receiver unit and a reference voltage; a first voltage regulation circuit coupled to the comparator and to the positive input terminal of the receiver unit, the first voltage regulation circuit being adapted to regulate a voltage at the positive input terminal in response to the comparator output signal if the positive input terminal is selected; and a second voltage regulation circuit coupled to the comparator and to the negative input terminal of the receiver unit, the second voltage regulation circuit being adapted to regulate a voltage at the negative input terminal in response to the comparator output signal if the negative input terminal is selected; wherein the first voltage regulation circuit comprises a controller and a first programmable attenuator connected to the positive input terminal of the receiver unit; wherein the second voltage regulation circuit comprises the controller and a second programmable attenuator connected to the negative input terminal of the receiver unit; wherein the first programmable attenuator includes a first M-bit controlled resistor array and a first N-bit controlled capacitor array, the first M-bit controlled resistor array being adapted to regulate an amplitude of the voltage at the positive input terminal of the receiver unit, the first N-bit controlled capacitor array being adapted to regulate a phase of the voltage at the positive input terminal of the receiver unit; and wherein the second programmable attenuator includes a second M-bit controlled resistor array and a second N-bit controlled capacitor array, the second M-bit controlled resistor array being adapted to regulate an amplitude of the voltage at the negative input terminal of the receiver unit, the second N-bit controlled capacitor array being adapted to regulate a phase of the voltage at the negative input terminal of the receiver unit. 9. A contactless communication device comprising: a receiver unit having differential input terminals for connecting to an antenna, said differential input terminals of the receiver unit including a positive input terminal and a negative input terminal; a comparator adapted to generate a comparator output signal indicative of a relationship between a voltage at a selected one of the positive input terminal and the negative input terminal of the receiver unit and a reference voltage; a first voltage regulation circuit coupled to the comparator and to the positive input terminal of the receiver unit, the first voltage regulation circuit being adapted to regulate a voltage at the positive input terminal in response to the comparator output signal if the positive input terminal is selected; and a second voltage regulation circuit coupled to the comparator and to the negative input terminal of the receiver unit, the second voltage regulation circuit being adapted to regulate a voltage at the negative input terminal in response to the comparator output signal if the negative input terminal is selected; wherein the first voltage regulation circuit comprises a controller and a first programmable attenuator connected to the positive input terminal of the receiver unit; wherein the second voltage regulation circuit comprises the controller and a second programmable attenuator connected to the negative input terminal
Assignees
Inventors
Classifications
using continuously variable impedance elements · CPC title
concerning mainly a recovery circuit for the reference signal · CPC title
- H04B5/0025Primary
Electricity · mapped topic
Terminal devices · CPC title
being attenuating element · CPC title
Patent family
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Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US10291291B2 cover?
- A contactless communication device includes a receiver unit having differential input terminals for connecting to an antenna. The receiver unit is coupled to a transmitting device and receives an RF signal transmitted by the transmitting device. A first comparator is adapted to generate a first comparator output signal indicative of a relationship between a voltage at a positive input terminal …
- Who is the assignee on this patent?
- Nxp Bv
- What technology area does this patent fall under?
- Primary CPC classification H04B5/0025. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue May 14 2019 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 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).