公开(公告)号：US09292721B2

公开(公告)日：2016-03-22

申请号：US14186029

申请日：2014-02-21

Applicant: Texas Instruments Incorporated

Inventor： Abhishek Agrawal ,  Yogesh Darwhekar

IPC: G06K19/06 ,  G06K7/10

CPC classification number: H04W4/80 ,  G06K7/10237 ,  H04B5/0056

Abstract: An electronic communication device includes an antenna configured to receive a radio frequency (RF) signal and generate a differential current signal at a first tag pin and a second tag pin. A first variable resistor is coupled to the first tag pin and a second variable resistor is coupled to the second tag pin. A mixer circuit is coupled across the first variable resistor and the second variable resistor and is configured to generate an output voltage. The output voltage is used for RF signal detection at all RF signal levels.

Abstract translation: 电子通信装置包括：天线，被配置为在第一标签引脚和第二标签引脚处接收射频（RF）信号并产生差分电流信号。 第一可变电阻器耦合到第一标签引脚，第二可变电阻器耦合到第二标签引脚。 混频器电路跨越第一可变电阻器和第二可变电阻器耦合，并且被配置为产生输出电压。 输出电压用于所有RF信号电平的RF信号检测。

公开(公告)号：US09246552B2

公开(公告)日：2016-01-26

申请号：US14318606

申请日：2014-06-28

Applicant: Texas Instruments Incorporated

Inventor： Abhishek Agrawal ,  Yogesh Darwhekar ,  Gireesh Rajendran

IPC: H04B5/00 ,  H04B17/00 ,  H02M7/217

CPC classification number: G05F1/613 ,  H02M7/217 ,  H04B5/0031

Abstract: A digital shunt regulator receives a radio frequency (RF) signal at an antenna which generates a differential output signal over a differential path. A peak detector is coupled to the antenna and receives the differential output signal over the differential path. A first comparator receives a voltage output of the peak detector and a first voltage. A second comparator receives the voltage output of the peak detector and a second voltage. A digital state machine receives an output of the first comparator and an output of the second comparator. A plurality of shunt NMOS transistors receives an output of the digital state machine. The digital state machine is configured to control the number of shunt NMOS transistors that are activated to maintain the voltage output of the peak detector between the first voltage and the second voltage.

Abstract translation: 数字分流调节器在天线处接收射频（RF）信号，其在差分路径上产生差分输出信号。 峰值检测器耦合到天线，并通过差分路径接收差分输出信号。 第一比较器接收峰值检测器的电压输出和第一电压。 第二比较器接收峰值检测器的电压输出和第二电压。 数字状态机接收第一比较器的输出和第二比较器的输出。 多个并联NMOS晶体管接收数字状态机的输出。 数字状态机被配置为控制被激活的并联NMOS晶体管的数量，以将峰值检测器的电压输出保持在第一电压和第二电压之间。