Patents by Inventor Josiah A. Bartlett

Josiah A. Bartlett has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20190170790
    Abstract: A test and measurement probe coupler that may include a substrate, a first signal tap conductor, a first signal contact, a first ground tap conductor, and a first ground contact. The first signal tap conductor may extends a first length along the substrate. The first signal contact may be electrically coupled to the first signal tap conductor, and the first ground tap conductor may extend a second length along the substrate. The first ground tap conductor may be substantially parallel to the first signal tap conductor. The first ground tap conductor may be disposed in a first lateral direction away from the first signal tap conductor, and the first ground contact electrically may be coupled to the first ground tap conductor.
    Type: Application
    Filed: October 16, 2018
    Publication date: June 6, 2019
    Applicant: Tektronix, Inc.
    Inventor: Josiah A. Bartlett
  • Patent number: 10215776
    Abstract: Test and measurement probes include a body, an adjustable member moveably coupled to the body and having a changeable position relative to the body, and a transducer subsystem structured to measure the position of the adjustable member and configured to output a position signal indicative of the position of the adjustable member. A change in the position of the adjustable member causes a change in an electrical characteristic of the probe. A position-dependent correction factor may be used to correct the change in the electrical characteristic. Methods of compensating for a change in a response of a test and measurement system include monitoring a position sensor output to detect a position change of a first part of a probe relative to a second part, determining that the position sensor output value has crossed a boundary value between a first and second range, and applying a compensation factor corresponding to the second range to modify the response of the system.
    Type: Grant
    Filed: October 26, 2015
    Date of Patent: February 26, 2019
    Assignee: Tektronix, Inc.
    Inventors: Julie A. Campbell, Josiah A. Bartlett, David A. Sailor, Jay Schwichtenberg
  • Publication number: 20170115325
    Abstract: Test and measurement probes include a body, an adjustable member moveably coupled to the body and having a changeable position relative to the body, and a transducer subsystem structured to measure the position of the adjustable member and configured to output a position signal indicative of the position of the adjustable member. A change in the position of the adjustable member causes a change in an electrical characteristic of the probe. A position-dependent correction factor may be used to correct the change in the electrical characteristic. Methods of compensating for a change in a response of a test and measurement system include monitoring a position sensor output to detect a position change of a first part of a probe relative to a second part, determining that the position sensor output value has crossed a boundary value between a first and second range, and applying a compensation factor corresponding to the second range to modify the response of the system.
    Type: Application
    Filed: October 26, 2015
    Publication date: April 27, 2017
    Inventors: Julie A. Campbell, Josiah A. Bartlett, David A. Sailor, Jay Schwichtenberg
  • Patent number: 9581675
    Abstract: System and methods may allow an operator of a signal measurement instrument to characterize and calibrate a network with unsupported connector types, e.g., not traceable to known standards. Adapters having supported and unsupported interfaces can be used to measure the system responses of networks in a system under test. These measurements can be mathematically cascaded to deduce virtual models that produce an accurate and fully calibrated total system response.
    Type: Grant
    Filed: February 21, 2013
    Date of Patent: February 28, 2017
    Assignee: TEKTRONIX, Inc.
    Inventors: Laudie J. Doubrava, Josiah A. Bartlett
  • Patent number: 8810258
    Abstract: A signal acquisition system has a signal acquisition probe having probe tip circuitry coupled to a resistive center conductor signal cable. The resistive center conductor signal cable of the signal acquisition probe is coupled to a compensation system in a signal processing instrument via an input node and input circuitry in the signal processing instrument. The signal acquisition probe and the signal processing instrument have mismatched time constants at the input node with the compensation system having an input amplifier with feedback loop circuitry and a shunt pole-zero pair coupled to the input circuitry providing pole-zero pairs for maintaining flatness over the signal acquisition system frequency bandwidth.
    Type: Grant
    Filed: January 4, 2013
    Date of Patent: August 19, 2014
    Assignee: Tektronix, Inc.
    Inventors: Josiah A. Bartlett, Ira G. Pollock, Daniel G. Knierim, Michael D. Stevens
  • Patent number: 8791706
    Abstract: A signal acquisition system has a signal acquisition probe having probe tip circuitry coupled to a resistive center conductor signal cable. The resistive center conductor signal cable is coupled to a compensation system in a signal processing instrument via an input node and input circuitry in the signal processing instrument. The signal acquisition probe and the signal processing instrument have mismatched time constants at the input node with the compensation system having an input amplifier with feedback loop circuitry and a compensation digital filter providing pole-zero pairs for maintaining flatness over the signal acquisition system frequency bandwidth.
    Type: Grant
    Filed: June 14, 2012
    Date of Patent: July 29, 2014
    Assignee: Tektronix, Inc.
    Inventors: Josiah A. Bartlett, Ira G. Pollock, Daniel G. Knierim, Michael Duane Stevens
  • Patent number: 8723530
    Abstract: A signal acquisition system has a signal acquisition probe having probe tip circuitry coupled to a resistive center conductor signal cable. The resistive center conductor signal cable of the signal acquisition probe is coupled to a compensation system in a signal processing instrument via an input node and input circuitry in the signal processing instrument. The signal acquisition probe and the signal processing instrument have mismatched time constants at the input node with the compensation system providing pole-zero pairs for maintaining flatness over the signal acquisition system frequency bandwidth.
    Type: Grant
    Filed: April 1, 2013
    Date of Patent: May 13, 2014
    Assignee: Tektronix, Inc.
    Inventors: Josiah A. Bartlett, Ira G. Pollock, Daniel G. Knierim, Lester L. Larson, Scott R. Jansen, Kenneth P. Dobyns, Michael Duane Stevens
  • Publication number: 20140058693
    Abstract: System and methods may allow an operator of a signal measurement instrument to characterize and calibrate a network with unsupported connector types, e.g., not traceable to known standards. Adapters having supported and unsupported interfaces can be used to measure the system responses of networks in a system under test. These measurements can be mathematically cascaded to deduce virtual models that produce an accurate and fully calibrated total system response.
    Type: Application
    Filed: February 21, 2013
    Publication date: February 27, 2014
    Applicant: TEKTRONIX, INC.
    Inventors: Laudie J. Doubrava, Josiah A. Bartlett
  • Patent number: 8611436
    Abstract: A balun structure is disclosed having positive and negative going signal paths coupled to a ninety degree hybrid. The positive signal path has a circuit trace and a phase shaper structure that provides three hundred and sixty degrees of phase shift at Port 1 of the hybrid. The negative going signal path has a circuit trace and a second order phase shaper that provides four hundred and fifty degrees of phase shift at Port 2 of the hybrid. Port 1 is coupled to Port 3 of the hybrid and functions as an output port. The first order phase shaper and the second order phase shaper compensate for the signal loss caused by a signal cable coupled to the output port and provide a frequency band from DC to at least 15 GHz and a transient response having less than ten percent pre-shoot.
    Type: Grant
    Filed: December 31, 2011
    Date of Patent: December 17, 2013
    Assignee: Tektronix, Inc.
    Inventors: Daniel G. Knierim, James S. Lamb, Josiah A. Bartlett
  • Patent number: 8564308
    Abstract: A signal acquisition system has a signal acquisition probe having probe tip circuitry coupled to a resistive center conductor signal cable. The resistive center conductor signal cable of the signal acquisition probe is coupled to a compensation system in a signal processing instrument via an input node and input circuitry in the signal processing instrument. The signal acquisition probe and the signal processing instrument have mismatched time constants at the input node with the compensation system having an input amplifier with feedback loop circuitry and a shunt pole-zero pair coupled to the input circuitry providing pole-zero pairs for maintaining flatness over the signal acquisition system frequency bandwidth.
    Type: Grant
    Filed: July 29, 2010
    Date of Patent: October 22, 2013
    Assignee: Tektronix, Inc.
    Inventors: Josiah A. Bartlett, Ira G. Pollock, Daniel G. Knierim, Lester L. Larson, Scott R. Jansen, Kenneth P. Dobyns, Michael Duane Stevens
  • Publication number: 20130245977
    Abstract: A test and measurement instrument and method for providing post-acquisition trigger control and presentation of associated waveforms on a display. An electrical signal under test is sampled and digitized, and stored in an acquisition memory as a data record. A display device draws a waveform associated with the signal under test. After the acquisition of the digital samples is stopped, a user selects trigger criteria using trigger controls such as a trigger level control. A trigger circuit detects a post-acquisition trigger event in the data record based on the trigger criteria causing an automatic adjustment of the waveform to conform to a time of the post-acquisition trigger event. One or more configurable trigger controls can be used to adjust a display of post-acquisition trigger events and waveforms. Upon resumption of the live-acquisition of data, the live waveform conforms to the newly selected trigger criteria as previewed during the post-acquisition mode.
    Type: Application
    Filed: May 1, 2013
    Publication date: September 19, 2013
    Applicant: Tektronix, Inc.
    Inventors: Josiah A. Bartlett, Kristie L. Veith, Steven K. Sullivan
  • Patent number: 8456173
    Abstract: A signal acquisition system has a signal acquisition probe having probe tip circuitry coupled to a resistive center conductor signal cable with the signal cable coupled to a signal processing instrument via an input node. The input node is coupled to an input current amplifier via input circuitry. The input circuitry provides at least one of resistive and capacitive termination of the resistive center conductor signal cable. The termination of the resistive center conductor signal cable in the signal processing instrument provides a signal acquisition system where the capacitive loading of a device under test at higher frequencies is reduced by reducing the input capacitance of the probe tip circuitry resulting in an increase in the signal acquisition system bandwidth.
    Type: Grant
    Filed: July 29, 2010
    Date of Patent: June 4, 2013
    Assignee: Tektronix, Inc.
    Inventors: Daniel G. Knierim, Josiah A. Bartlett, Ira G. Pollock, Lester L. Larson
  • Patent number: 8436624
    Abstract: A signal acquisition system has a signal acquisition probe having probe tip circuitry coupled to a resistive center conductor signal cable. The resistive center conductor signal cable of the signal acquisition probe is coupled to a compensation system in a signal processing instrument via an input node and input circuitry in the signal processing instrument. The signal acquisition probe and the signal processing instrument have mismatched time constants at the input node with the compensation system providing pole-zero pairs for maintaining flatness over the signal acquisition system frequency bandwidth.
    Type: Grant
    Filed: July 29, 2010
    Date of Patent: May 7, 2013
    Assignee: Tektronix, Inc.
    Inventors: Josiah A. Bartlett, Ira G. Pollock, Daniel G. Knierim, Lester L. Larson, Scott R. Jansen, Kenneth P. Dobyns, Michael Duane Stevens
  • Publication number: 20130022133
    Abstract: A balun structure is disclosed having positive and negative going signal paths coupled to a ninety degree hybrid. The positive signal path has a circuit trace and a phase shaper structure that provides three hundred and sixty degrees of phase shift at Port 1 of the hybrid. The negative going signal path has a circuit trace and a second order phase shaper that provides four hundred and fifty degrees of phase shift at Port 2 of the hybrid. Port 1 is coupled to Port 3 of the hybrid and functions as an output port. The first order phase shaper and the second order phase shaper compensate for the signal loss caused by a signal cable coupled to the output port and provide a frequency band from DC to at least 15 GHz and a transient response having less than ten percent pre-shoot.
    Type: Application
    Filed: December 31, 2011
    Publication date: January 24, 2013
    Applicant: TEKTRONIX, INC.
    Inventors: Daniel G. Knierim, James S. Lamb, Josiah A. Bartlett
  • Publication number: 20120268140
    Abstract: A signal acquisition system has a signal acquisition probe having probe tip circuitry coupled to a resistive center conductor signal cable. The resistive center conductor signal cable is coupled to a compensation system in a signal processing instrument via an input node and input circuitry in the signal processing instrument. The signal acquisition probe and the signal processing instrument have mismatched time constants at the input node with the compensation system having an input amplifier with feedback loop circuitry and a compensation digital filter providing pole-zero pairs for maintaining flatness over the signal acquisition system frequency bandwidth.
    Type: Application
    Filed: June 14, 2012
    Publication date: October 25, 2012
    Applicant: Tektronix, Inc.
    Inventors: Josiah A. Bartlett, Ira G. Pollock, Daniel G. Knierim, Michael Duane Stevens
  • Patent number: 8278940
    Abstract: A signal acquisition system has a signal acquisition probe having probe tip circuitry coupled to a resistive center conductor signal cable. The resistive center conductor signal cable is coupled to a compensation system in a signal processing instrument via an input node and input circuitry in the signal processing instrument. The signal acquisition probe and the signal processing instrument have mismatched time constants at the input node with the compensation system having an input amplifier with feedback loop circuitry and a compensation digital filter providing pole-zero pairs for maintaining flatness over the signal acquisition system frequency bandwidth.
    Type: Grant
    Filed: July 29, 2010
    Date of Patent: October 2, 2012
    Assignee: Tektronix, Inc.
    Inventors: Josiah A. Bartlett, Ira G. Pollock, Daniel G. Knierim, Lester L. Larson, Scott R. Jansen, Kenneth P. Dobyns
  • Patent number: 8024141
    Abstract: A test and measurement instrument and method for providing post-acquisition trigger control and presentation of associated waveforms on a display. An electrical signal under test is sampled and digitized, and stored in an acquisition memory as a data record. A display device draws a waveform associated with the signal under test. After the acquisition of the digital samples is stopped, a user selects trigger criteria using trigger controls such as a trigger level control. A trigger circuit detects a post-acquisition trigger event in the data record based on the trigger criteria causing an automatic adjustment of the waveform to conform to a time of the post-acquisition trigger event. One or more configurable trigger controls can be used to adjust a display of post-acquisition trigger events and waveforms. Upon resumption of the live-acquisition of data, the live waveform conforms to the newly selected trigger criteria as previewed during the post-acquisition mode.
    Type: Grant
    Filed: October 8, 2009
    Date of Patent: September 20, 2011
    Assignee: Tektronix, Inc.
    Inventors: Josiah A. Bartlett, Kristie L. Veith, Steven K. Sullivan
  • Publication number: 20110074391
    Abstract: A signal acquisition system has a signal acquisition probe having probe tip circuitry coupled to a resistive center conductor signal cable. The resistive center conductor signal cable is coupled to a compensation system in a signal processing instrument via an input node and input circuitry in the signal processing instrument. The signal acquisition probe and the signal processing instrument have mismatched time constants at the input node with the compensation system having an input amplifier with feedback loop circuitry and a compensation digital filter providing pole-zero pairs for maintaining flatness over the signal acquisition system frequency bandwidth.
    Type: Application
    Filed: July 29, 2010
    Publication date: March 31, 2011
    Applicant: TEKTRONIX, INC.
    Inventors: Josiah A. Bartlett, Ira G. Pollock, Daniel G. Knierim, Lester L. Larson, Scott R. Jansen, Kenneth P. Dobyns, Michael Duane Stevens
  • Publication number: 20110074441
    Abstract: A low capacitance signal acquisition system has a signal acquisition probe having a low capacitance input circuit coupled to a compensation amplifier in a signal processing instrument via a signal cable. The low capacitance input circuit, the signal cable and the signal processing instrument input have mismatched time constants with the compensation amplifier having feedback loop circuitry providing adjustable gain and pole-zero pairs for maintaining flatness over the low capacitance signal acquisition system frequency bandwidth.
    Type: Application
    Filed: September 30, 2009
    Publication date: March 31, 2011
    Applicant: TEKTRONIX, INC.
    Inventors: Josiah A. Bartlett, Ira G. Pollock, Daniel G. Knierim, Lester L. Larson, Scott R. Jansen, Kenneth P. Dobyns, Michael Duane Stevens
  • Publication number: 20110074390
    Abstract: A signal acquisition system has a signal acquisition probe having probe tip circuitry coupled to a resistive center conductor signal cable. The resistive center conductor signal cable of the signal acquisition probe is coupled to a compensation system in a signal processing instrument via an input node and input circuitry in the signal processing instrument. The signal acquisition probe and the signal processing instrument have mismatched time constants at the input node with the compensation system providing pole-zero pairs for maintaining flatness over the signal acquisition system frequency bandwidth.
    Type: Application
    Filed: July 29, 2010
    Publication date: March 31, 2011
    Applicant: TEKTRONIX, INC.
    Inventors: Josiah A. Bartlett, Ira G. Pollock, Daniel G. Knierim, Lester L. Larson, Scott R. Jansen, Kenneth P. Dobyns, Michael Duane Stevens