公开(公告)号：US20200162076A1

公开(公告)日：2020-05-21

申请号：US16193649

申请日：2018-11-16

Applicant: Analog Devices Global Unlimited Company

Inventor： Alan Patrick Cahill ,  Michal Brychta ,  Patrick C. Kirby

IPC: H03K19/0175 ,  H03C3/02 ,  H03D7/00 ,  H04B1/04 ,  H04B1/16 ,  H04L27/12

Abstract: Techniques for mixing, or modulating, a high-frequency, digital communication signal with a low-frequency, analog current loop signal are provided. In certain examples, the techniques allow mixing the signals in a non-AC coupled manner. In certain examples, such mixing techniques can allow for simplified connections between a modem chip and an analog current loop interface chip of an analog I/O module.

公开(公告)号：US10181853B2

公开(公告)日：2019-01-15

申请号：US15456160

申请日：2017-03-10

Applicant: Analog Devices Global

Inventor： Colm Slattery ,  Patrick C. Kirby ,  Albert O'Grady ,  Denis O'Connor ,  Michael Collins ,  Valerie Hamilton ,  Aidan J. Cahalane ,  Michal Brychta

IPC: H03K19/0175 ,  H01L27/02 ,  H03K19/177 ,  G01R31/317

Abstract: Systems for monitoring or control can include reconfigurable input and output channels. Such reconfigurable channels can include as few as a single terminal and a ground pin, or such channels can include three or four terminal configuration such as for use in four-terminal resistance measurements. Channel reconfiguration can be accomplished such as using software-enabled or firmware-enabled control of channel hardware. Such channel hardware can include analog-to-digital and digital-to-analog conversion capability, including use of a digital-to-analog converter to provide field power or biasing. In an example, the interface circuit can provide a selectable impedance.

公开(公告)号：US20170023506A1

公开(公告)日：2017-01-26

申请号：US15187398

申请日：2016-06-20

Applicant: Analog Devices Global

Inventor： Colin G. Lyden ,  Donal Bourke ,  Dennis A. Dempsey ,  Dermot G. O'Keeffe ,  Patrick C. Kirby

IPC: G01N27/02 ,  G01N27/49 ,  G01N27/327 ,  H03F3/45 ,  H03F1/34

CPC classification number: G01N27/028 ,  G01N27/3273 ,  G01N27/49 ,  H03F1/34 ,  H03F3/45475 ,  H03F2200/261 ,  H03F2200/462 ,  H03L5/00

Abstract: A control circuit for use with a four terminal sensor, the sensor having first and second drive terminals and first and second measurement terminals, the control circuit arranged to drive at least one of the first and second drive terminals with an excitation signal, to sense a voltage difference between the first and second measurement terminals, and control the excitation signal such that the voltage difference between the first and second measurement terminals is within a target range of voltages, and wherein the control circuit includes N poles in its transfer characteristic and N−1 zeros in its transfer characteristic such that when a loop gain falls to unity the phase shift around a closed loop is not substantially 2π radians or a multiple thereof, where N is greater than 1.

Abstract translation: 一种与四端子传感器一起使用的控制电路，所述传感器具有第一和第二驱动端子以及第一和第二测量端子，所述控制电路被布置成用激励信号驱动第一和第二驱动端子中的至少一个，以感测 并且控制所述激励信号，使得所述第一测量端子与所述第二测量端子之间的电压差在目标电压范围内，并且其中所述控制电路在其传输特性中包括N极，并且所述N- 1的零传递特性使得当环路增益下降到1时，围绕闭环的相移基本上不是2π弧度或其倍数，其中N大于1。