公开(公告)号：US20130221980A1

公开(公告)日：2013-08-29

申请号：US13862035

申请日：2013-04-12

Applicant: Tektronix, Inc.

Inventor： Patrick A. Smith ,  David L. Kelly ,  Que T. Tran ,  Shane A. Hazzard

IPC: G01R31/02

CPC classification number: G06F19/00 ,  G01R13/02 ,  G01R13/0254 ,  G01R31/02

Abstract: A test and measurement apparatus, system, and method for synchronizing an acquisition or triggering system to a specific burst of interest. The subject apparatus and method triggers on varying energy content of a signal qualified by time in the presence of high-frequency input signal bursts, by using an adjustable pulse width envelope detector, disposed in the signal path of the trigger circuitry, as a digital rectifier or to otherwise process and extract an envelope signal. An RF envelope probe having an analog envelope detector among other suitable components is disclosed. A method is implemented for isolating an interval of interest in a signal under test. An envelope detector circuit produces an envelope signal from the signal. Trigger circuitry receives the envelope signal from the envelope detector, and isolates the interval of interesting in the signal under test using the envelope signal.

公开(公告)号：US10481179B2

公开(公告)日：2019-11-19

申请号：US15172541

申请日：2016-06-03

Applicant: Tektronix, Inc.

Inventor： David L. Kelly ,  Patrick A. Smith

IPC: G01R23/02 ,  G01R13/32 ,  G01R13/02

Abstract: A test and measurement instrument including an input port configured to receive an input signal. One or more divider circuits, coupled to the input port, employ a plurality of divide ratios such that each divide ratio scales an event signal indicating events in the input signal by a predetermined integer value. A control system is also included. The control system is configured to iteratively determine an estimated signal frequency of the event signal, and automatically select a divide ratio for the event signal based on the estimated signal frequency. The instrument may also include one or more counters to count triggers in the event signal subsequent to application of the divide ratio. The instrument may also employ frequency hysteresis to prevent chatter in divide ratio selection.

公开(公告)号：US20180372780A1

公开(公告)日：2018-12-27

申请号：US15796722

申请日：2017-10-27

Applicant: Tektronix, Inc.

Inventor： David L. Kelly ,  Jed H. Andrews ,  Patrick A. Smith ,  Michael A. Martin

IPC: G01R13/02

Abstract: A test and measurement instrument, such as an oscilloscope, including one or more ports to receive one or more signals from a device under test, a trigger enable logic circuit configured to output a trigger enabled signal when a trigger enable event occurs within the one or more signals, the trigger enable event being a real-time event of the one or more signals, one or more trigger logic circuits configured to generate a plurality of trigger signals when the trigger enable signal is received, each trigger signal being generated when a trigger event occurs within one of the one or more signals, and an acquisition circuit configured to acquire and store data in a memory in response to each of the trigger signals.

公开(公告)号：US20170207987A1

公开(公告)日：2017-07-20

申请号：US15395600

申请日：2016-12-30

Applicant: Tektronix, Inc.

Inventor： David L. Kelly ,  Patrick A. Smith ,  Jed H. Andrews ,  Keith D. Rule

IPC: H04L12/26 ,  H04L12/24

CPC classification number: H04L43/08 ,  H04L41/0631 ,  H04L41/0816 ,  H04L41/22 ,  H04L43/04 ,  H04L43/50

Abstract: An apparatus and method that captures a complete history of serial network Link Training negotiations by continuously monitoring multiple analog signals representing both sides of full duplex lanes in real-time by pattern matching the Link Training Frame Marker and the subsequent negotiation request/response data values. The apparatus and method compare the digitized version of the incoming signal against a nominal pattern at the start to find the Frame Markers and Control Channel data, storing only those Control Channel data values that do not match the current compare pattern, and further by updating the current compare pattern to the new pattern just received, so that only the transitions in the data values are stored, thereby vastly reducing the amount of data presented to the user, but nonetheless retaining the complete substantive history of the Link Training negotiations.