Patents Assigned to Jet City Electronics
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Patent number: 7436865Abstract: A tunable optical oscillator with a period based on the speed of light is used to produce a periodic pulsed light signal with low jitter, low drift and high spectral purity. The pulsed light signal is generated through the use of a light source such as a laser, an optical switch, and two variable optical paths acting as delay elements. The variable delay elements form the basis of the system timing. The propagation time of the light signals passing through the delay elements determine the frequency of operation. The output frequency is based on the speed of light through these delay elements. The delay elements can be produced with materials that have a stable index of refraction over a temperature range and therefore the speed of light remains constant over a wide temperature range.Type: GrantFiled: March 2, 2007Date of Patent: October 14, 2008Assignee: Jet City Electronics, Inc.Inventor: Stephen A. Tibbitts
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Patent number: 6954113Abstract: A programmable crystal oscillator is provided having a memory for storing frequency-defining parameters. Typically, one of these parameters is used to program an adjustable capacitive load circuit coupled to a crystal to thereby adjust the crystal source frequency. Additional parameters are used to program the output frequency of a phase locked loop circuit coupled to receive the adjusted source frequency. A further parameter can also be used to divide the output frequency of the phase locked loop circuit to supply a specified output frequency. The oscillators can be manufactured as generic programmable crystal oscillators without regard for output frequency and then quickly programmed to produce customer-specified output frequencies with a high degree of accuracy.Type: GrantFiled: February 19, 2003Date of Patent: October 11, 2005Assignees: Fox Electronics, Inc., Jet City ElectronicsInventors: John W. Fallisgaard, Eugene S. Trefethan
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Patent number: 6664860Abstract: A programmable crystal oscillator is provided having a memory for storing frequency-defining parameters. Typically, one of these parameters is used to program an adjustable capacitive load circuit coupled to a crystal to thereby adjust the crystal source frequency. Additional parameters are used to program the output frequency of a phase locked loop circuit coupled to receive the adjusted source frequency. A further parameter can also be used to divide the output frequency of the phase locked loop circuit to supply a specified output frequency. The oscillators can be manufactured as generic programmable crystal oscillators without regard for output frequency and then quickly programmed to produce customer-specified output frequencies with a high degree of accuracy.Type: GrantFiled: January 5, 2001Date of Patent: December 16, 2003Assignees: Fox Enterprises, Inc., Jet City ElectronicsInventors: John W. Fallisgaard, Eugene S. Trefethan
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Patent number: 6528842Abstract: An Electrically Erasable Programmable Read Only Memory (EEPROM) cell uses a single standard NMOS (or PMOS) transistor with its gate connected to a Metal-Insulator-Metal, or Poly-Insulator-Poly capacitor such that a floating gate is formed. The floating gate is programmed and erased via Fowler-Nordheim tunneling.Type: GrantFiled: December 31, 2001Date of Patent: March 4, 2003Assignee: Jet City Electronics, Inc.Inventors: Thomas M. Luich, David Byrd
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Publication number: 20010017573Abstract: A programmable crystal oscillator is provided having a memory for storing frequency-defining parameters. Typically, one of these parameters is used to program an adjustable capacitive load circuit coupled to a crystal to thereby adjust the crystal source frequency. Additional parameters are used to program the output frequency of a phase locked loop circuit coupled to receive the adjusted source frequency. A further parameter can also be used to divide the output frequency of the phase locked loop circuit to supply a specified output frequency. The oscillators can be manufactured as generic programmable crystal oscillators without regard for output frequency and then quickly programmed to produce customer-specified output frequencies with a high degree of accuracy.Type: ApplicationFiled: January 5, 2001Publication date: August 30, 2001Applicant: Fox Enterprises, Inc., a Florida Corporation and Jet City Electronic, a Washington CorporationInventors: John W. Fallisgaard, Eugene S. Trefethan
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Patent number: 6188290Abstract: A programmable crystal oscillator is provided having a memory for storing frequency-defining parameters. Typically, one of these parameters is used to program an adjustable capacitive load circuit coupled to a crystal to thereby adjust the crystal source frequency. Additional parameters are used to program the output frequency of a phase locked loop circuit coupled to receive the adjusted source frequency. A further parameter can also be used to divide the output frequency of the phase locked loop circuit to supply a specified output frequency. The oscillators can be manufactured as generic programmable crystal oscillators without regard for output frequency and then quickly programmed to produce customer-specified output frequencies with a high degree of accuracy.Type: GrantFiled: May 3, 1999Date of Patent: February 13, 2001Assignees: Fox Enterprises, Inc., Jet City ElectronicsInventors: John W. Fallisgaard, Eugene S. Trefethen
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Patent number: 5952890Abstract: A programmable crystal oscillator is provided having a memory for storing frequency-defining parameters. Typically, one of these parameters is used to program an adjustable capacitive load circuit coupled to a crystal to thereby adjust the crystal source frequency. Additional parameters are used to program the output frequency of a phase locked loop circuit coupled to receive the adjusted source frequency. A further parameter can also be used to divide the output frequency of the phase locked loop circuit to supply a specified output frequency. The oscillators can be manufactured as generic programmable crystal oscillators without regard for output frequency and then quickly programmed to produce customer-specified output frequencies with a high degree of accuracy.Type: GrantFiled: February 5, 1997Date of Patent: September 14, 1999Assignees: Fox Enterprises, Inc., Jet City ElectronicsInventors: John W. Fallisgaard, Eugene S. Trefethan