JOHN ROBERT BURGOON, III
Pilots at Twyla Ln, Campbell, CA
License number
California A0253205
Issued Date
Feb 2016
Expiration Date
Feb 2018
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
4023 Twyla Ln, Campbell, CA 95008
Professional information
Crystal Oscillator Having Low Noise Signal Extraction Circuit
US Patent:
4283691, Aug 11, 1981
Filed:
May 29, 1979
Appl. No.:
6/043591
Inventors:
John R. Burgoon - Campbell CA
Assignee:
Hewlett-Packard Company - Palo Alto CA
International Classification:
H03B 536
US Classification:
331116R
Abstract:
A method and apparatus for minimizing the noise component of the output signal from a resonator oscillator. A single transistor or Darlington pair of transistors in the common base configuration is placed in series with the crystal resonator of the oscillator with a selected output load impedance connected between the base and collector of the transistors. By making use of this configuration, it is possible to use the crystal resonator as an initial filter to minimize the noise component of the output signal contributed by the oscillator loop as well as minimizing the inherent noise component from the output buffer amplifiers in the output signal. A common base configuration of both of these embodiments provides a low impedance load on the oscillator loop thus minimizing the effect on tuning or Q of the oscillator while making it possible to select an output impedance load that is of sufficient size to present an output signal having a sufficiently high signal to noise ratio to provide the minimization sought.
Oscillator Mode Suppression Apparatus Having Bandpass Effect
US Patent:
4378532, Mar 29, 1983
Filed:
Aug 27, 1981
Appl. No.:
6/296746
Inventors:
John R. Burgoon - Campbell CA
Assignee:
Hewlett Packard Company - Palo Alto CA
International Classification:
H01P 118
US Classification:
331158
Abstract:
An apparatus utilizing the basic oscillation characteristics of the Colpitts or Pierce and Hartley oscillator configurations. In this embodiment the basic shunt reactive shunt arms are replaced with a selected pair of tank circuits or one of the shunt arms with a series-parallel tank circuit.
These tank circuits are tuned such that the sign of their effective reactances are the same between the range of resonant frequencies of the individual tank circuits or of the series and parallel resonant frequencies of the series-parallel tank. When this occurs and their sign differs from the sign of the effective reactance of the series reactive element, there is a 180. degree. signal phase shift in the feedback loop, and therefore oscillation.