公开(公告)号：US08159291B2

公开(公告)日：2012-04-17

申请号：US12848661

申请日：2010-08-02

Applicant: Aydin Arrigo

Inventor： Aydin Arrigo

IPC: H03D1/00 ,  H03D1/08 ,  H03D1/10

CPC classification number: H03J1/10

Abstract: An RFID reader device (31), of the type comprising a demodulator (6) for receiving from a RFID tag (11) an AM (Amplitude Modulation) wave (20) having a predetermined frequency (f) and for retrieving, from the AM wave (20), a demodulated output (6a) associated to predetermined positive or negative Amplitudes of said AM wave (20), said demodulated output having a portion with a frequency F. The AM demodulation system comprises at least a second demodulator (26) for receiving the AM wave (20) and retrieving a second demodulated output (26a) associated to Amplitudes opposite to the predetermined positive or negative Amplitudes, said second demodulated output having a portion with said frequency F; the RFID reader includes a block (27) having, in input, the demodulated output (6a) and the second demodulated output (26a) and returning, in output, an enforced demodulated output (30) with a portion with frequency (f1) doubled with respect to said frequency (F).

Abstract translation: 一种RFID读取器装置（31），包括用于从RFID标签（11）接收具有预定频率（f）的AM（幅度调制）波（20）并用于从AM 波（20），与所述AM波（20）的预定正或负幅度相关联的解调输出（6a），所述解调输出具有频率为F的部分.AM解调系统至少包括第二解调器（26） 用于接收AM波（20）并检索与预定正或负幅度相反的幅度相关联的第二解调输出（26a），所述第二解调输出具有所述频率F的一部分; RFID读取器包括在输入中具有解调输出（6a）和第二解调输出（26a）并且在输出端返回具有频率（f1）倍的部分的强制解调输出（30）的块（27） 相对于所述频率（F）。

公开(公告)号：US2413021A

公开(公告)日：1946-12-24

申请号：US48352243

申请日：1943-04-17

Applicant: INT STANDARD ELECTRIC CORP

Inventor： HENRY WOLFSON ,  CARDEN SHEPARD STANLEY

IPC: G01R21/04 ,  G01R29/10 ,  H01C7/04 ,  H03D1/08

CPC classification number: H01C7/04 ,  G01R21/04 ,  G01R29/10 ,  H03D1/08

公开(公告)号：US1549737A

公开(公告)日：1925-08-18

申请号：US32374519

申请日：1919-09-15

Applicant: GEN ELECTRIC

Inventor： ALEXANDERSON ERNST F W

IPC: H03D1/08 ,  H04B1/10

CPC classification number: H04B1/10 ,  H03D1/08

公开(公告)号：US1454085A

公开(公告)日：1923-05-08

申请号：US14486717

申请日：1917-01-27

Applicant: SPERRY ELMER A

Inventor： SPERRY ELMER A

IPC: H03D1/08

CPC classification number: H03D1/08

公开(公告)号：US20160173050A9

公开(公告)日：2016-06-16

申请号：US14214437

申请日：2014-03-14

Applicant: DockOn AG

Inventor： Forrest Brown ,  Patrick Rada ,  Alexandre Dupuy

IPC: H03G11/04 ,  H03D1/08

CPC classification number: H01P5/19 ,  H01Q7/00 ,  H01Q21/0075 ,  H03D1/08 ,  H03D1/18 ,  H03D7/02 ,  H03D7/12 ,  H03D7/165 ,  H03D7/166 ,  H03D11/04 ,  H03D11/08 ,  H03D2200/0043 ,  H03D2200/0098 ,  H03F1/08 ,  H03F3/04 ,  H03F3/191 ,  H03F2200/165 ,  H03F2200/294 ,  H03G11/04

Abstract: A logarithmic amplifier (LDA) is described that includes an amplifier configured to oscillate a modulated input signal, a feedback establishing a 180 degree phase shift between the amplifier input and the output and maintaining oscillation of the input signal, a parallel resonant circuit connected to the amplifier output causing the amplifier to resonate at or around a center frequency, and a controller connected to the amplifier input cyclically terminating oscillation of the input signal each time a pre-determined threshold of current is detected, the controller including a low pass filter configured to generate a second output signal having a repetition frequency. The LDA may be used for AM with or without a PLL and/or a superhetrodyne. The LDA may be implemented as a mixer and used for phase demodulation. The LDA may be used for phase demodulation. The LDA may be used in place of a low noise amplifier.

Abstract translation: 描述了对数放大器（LDA），其包括被配置为振荡调制输入信号的放大器，在放大器输入和输出之间建立180度相移并保持输入信号的振荡的反馈，并联谐振电路 放大器输出使得放大器在中心频率处或周围谐振，以及连接到放大器输入端的控制器，每当检测到电流的预定阈值时循环地终止输入信号的振荡，则控制器包括低通滤波器， 产生具有重复频率的第二输出信号。 LDA可用于具有或不具有PLL和/或超临界的AM。 LDA可以实现为混频器并用于相位解调。 LDA可用于相位解调。 可以使用LDA代替低噪声放大器。

公开(公告)号：US20140253229A1

公开(公告)日：2014-09-11

申请号：US13964119

申请日：2013-08-12

Applicant: Wanfu Ye ,  Xiang Gao ,  Dongpeng Hou

Inventor： Wanfu Ye ,  Xiang Gao ,  Dongpeng Hou

IPC: H03D1/08

CPC classification number: H03D1/08 ,  H03D1/10 ,  H03D1/18

Abstract: A BASK demodulator includes a signal modifying circuit and a low pass filter (LPF) that couples an amplifier to an output of the modifying circuit. The modifying circuit includes a signal scaling circuit, a rectifying circuit and an AC coupling circuit. A signal shaping circuit couples an output of the amplifier to an output of the demodulator. The signal scaling circuit scales an input BASK modulated signal to provide an unclipped scaled and biased alternating signal that alternates about a bias voltage at a minimum carrier frequency. The rectifying circuit rectifies the unclipped signal to provide a partially rectified signal that is decoupled by the AC coupling circuit to provide a clipped scaled and biased alternating signal. The LPF removes the signal from the clipped scaled and biased alternating signal to provide a demodulated signal, which then is amplified by the amplifier and shaped by the shaping circuit.

Abstract translation: BASK解调器包括将放大器耦合到修改电路的输出的信号修正电路和低通滤波器（LPF）。 修正电路包括信号缩放电路，整流电路和AC耦合电路。 信号整形电路将放大器的输出耦合到解调器的输出。 信号缩放电路对输入的BASK调制信号进行缩放以提供在最小载波频率上绕偏置电压交替的未切割的定标和偏置交替信号。 整流电路对未剪切信号进行整流，以提供由AC耦合电路解耦的部分整流信号，以提供限幅和偏置的交替信号。 LPF从被裁剪和偏置的交替信号中去除信号以提供解调信号，然后被放大器放大并由整形电路成形。

公开(公告)号：US08829987B2

公开(公告)日：2014-09-09

申请号：US13349070

申请日：2012-01-12

Applicant: Dirk Marien

Inventor： Dirk Marien

IPC: H03D1/08 ,  H03D1/10 ,  H04L27/06 ,  G06K19/07

CPC classification number: H04L27/06 ,  G06K19/0723 ,  H03D1/08 ,  H03D1/10 ,  H03D2200/0011

Abstract: The invention relates to modulation and demodulation circuits, such as envelope detectors used to demodulate amplitude-modulated (AM) signals. By coupling an analog circuit to a port of a digital component, a compact envelope detector can be obtained, which achieves demodulation of AM signals for direct coupling into a digital input port. Accordingly, a compact envelope detector may be used in the data receiving part of a sealed device requiring post-manufacturing data transfer, in combination with additional components that provide electromagnetic coupling, such as inductive, capacitive, or radiative. An example of such a device is a credit card sized authentication token.

Abstract translation: 本发明涉及调制和解调电路，例如用于解调幅度调制（AM）信号的包络检测器。 通过将模拟电路耦合到数字部件的端口，可以获得紧凑的包络检测器，其实现用于直接耦合到数字输入端口的AM信号的解调。 因此，紧凑的包络检测器可以与需要后期制造数据传输的密封装置的数据接收部分结合使用提供诸如感应，电容或辐射的电磁耦合的附加部件。 这种设备的示例是信用卡大小的认证令牌。

公开(公告)号：US3227958A

公开(公告)日：1966-01-04

申请号：US23961762

申请日：1962-11-23

Applicant: MARELLI LENKURT S P A

Inventor： BASILIO CATANIA

IPC: H03D1/08

CPC classification number: H03D1/08

公开(公告)号：US2714635A

公开(公告)日：1955-08-02

申请号：US54848944

申请日：1944-08-07

Applicant: SCHMITT OTTO H

Inventor： SCHMITT OTTO H

IPC: G01R33/025 ,  G01R33/04 ,  H03D1/08

CPC classification number: G01R33/025 ,  G01R33/04 ,  H03D1/08

公开(公告)号：US2460109A

公开(公告)日：1949-01-25

申请号：US38505441

申请日：1941-03-25

Applicant: BELL TELEPHONE LABOR INC

Inventor： SOUTHWORTH GEORGE C

IPC: H01G7/02 ,  H03C5/00 ,  H03D1/08

CPC classification number: H03D1/08 ,  H01G7/02 ,  H03C5/00