公开(公告)号：US20120112831A1

公开(公告)日：2012-05-10

申请号：US13349070

申请日：2012-01-12

Applicant: Dirk Marien

Inventor： Dirk Marien

IPC: H03D1/02

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：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：US773340A

公开(公告)日：1904-10-25

申请号：US1903170816

申请日：1903-08-26

Applicant: ELECTRICITE ET D AUTOMOBILES MORS SA D ,  ROCHEFORT OCTAVE

Inventor： ROCHEFORT OCTAVE

CPC classification number: H03D1/08

公开(公告)号：US762829A

公开(公告)日：1904-06-14

申请号：US1902117306

申请日：1902-07-28

Applicant: LODGE OLIVER JOSEPH ,  MUIRHEAD ALEXANDER ,  ROBINSON EDWARD ERNEST

Inventor： LODGE OLIVER JOSEPH ,  MUIRHEAD ALEXANDER ,  ROBINSON EDWARD ERNEST

CPC classification number: H03D1/08

公开(公告)号：US741767A

公开(公告)日：1903-10-20

申请号：US1902122749

申请日：1902-09-10

Applicant: THOMAS E CLARK WIRELESS TELEGRAPH TELEPHONE CO

Inventor： CLARK THOMAS E

CPC classification number: H03D1/08

公开(公告)号：US708071A

公开(公告)日：1902-09-02

申请号：US1901080388

申请日：1901-10-29

Applicant: CONS WIRELESS TELEGRAPH AND TELEPHONE COMPANY

Inventor： PICKARD GREENLEAF W

CPC classification number: H03D1/08

公开(公告)号：US644497A

公开(公告)日：1900-02-27

申请号：US1899736198

申请日：1899-11-07

Applicant: AMERICAN WIRELESS TELEPHONE AND TELEGRAPH COMPANY

Inventor： COLLINS ARCHIE FREDERICK

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。