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Device and method for a wireless transmitter

A wireless transmitter and voltage technology, which is applied in the direction of near-field transmission system using transceivers, components of amplifiers, amplifiers with semiconductor devices/discharge tubes, etc., can solve the problems that cannot be modulated by ASK

Pending Publication Date: 2021-01-05
STMICROELECTRONICS SRL +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although this general solution works for OOK modulation, this solution creates a non-monotonic waveform and thus cannot be used for ASK modulation

Method used

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  • Device and method for a wireless transmitter
  • Device and method for a wireless transmitter
  • Device and method for a wireless transmitter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] figure 1 An integrated circuit CI comprising a wireless transmitter TX configured, for example, to perform wireless communication according to the ISO 14443 Type A standard and / or the ISO 14443 Type B standard and / or the ISO 15693 standard and / or JIS.X.6319 is illustrated.

[0041] The wireless transmitter TX comprises a first supply (for example a first low dropout voltage regulator LDO_RF), a second supply (for example a second low dropout voltage regulator LDO_ASK), a control circuit CTRL and a signal for controlling the modulation pulse Envelope shape driver TX_DR.

[0042] The driver TX_DR comprises two channels RFO1 , RFO2 outputting signals in phase quadrature. Each channel comprises a respective modulation pre-driver PDR1, PDR2 and a respective modulation driver RFO1_DR, RFO2_DR.

[0043] The pre-driver PDRi is intended to amplify the input initially at logic level to a higher level capable of controlling the modulation driver RFOi_DR.

[0044] The control c...

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Abstract

The present invention describes a device and a method for a wireless transmitter. The method for controlling a signal envelope shape of modulation pulses in a driver of a wireless transmitter includessupplying a first voltage to the driver during a non-modulated state, supplying a second voltage configurable by a configurable modulation index value to the driver during a modulated state, switching between the non-modulated state and the modulated state comprising setting the modulation index value to configure the second voltage level at the same level as the first voltage and then switchingbetween supplying the first voltage to the driver and supplying the second voltage to the driver, and filtering to a limited bandwidth the variations of the second voltage resulting from configuring the modulation index value.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of European Application No. 19305889.8 filed on 1 July 2019, which is hereby incorporated by reference. technical field [0003] Embodiments relate to integrated circuits and methods, and in particular to integrated circuits including wireless transmitters including drivers for controlling the shape of the signal envelope of modulated pulses. Background technique [0004] The RFID ("Radio Frequency Identification") and NFC ("Near Field Communication") standards specify the modulation shape (rising edge, falling edge, overshoot, undershoot, and edge non-monotonicity). [0005] RFID and NFC systems are magnetically coupled systems where the presence of the receiver antenna affects the parameters of the transmitter antenna. This is often referred to as the "loading effect". Loading effects (magnetic coupling) can detune the transmitter antenna, which then usually leads to distortion...

Claims

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Application Information

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IPC IPC(8): H04L27/04H04B1/04
CPCH04L27/04H04B1/04H03C1/62H04B5/48H04B5/72H03F1/0227H03F3/217H03F3/24H03F2200/102H03F2200/351H04L25/4902H04L27/2613
Inventor K·考瓦斯克C·格伦德里切B·勒迪克A·斯特恩
Owner STMICROELECTRONICS SRL