The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 13, 1997
Filed:
May. 09, 1996
Frederick G Weiss, Newberg, OR (US);
Analog Devices, Corvallis, OR (US);
Abstract
Both differential and single-ended band-switchable VCOs are described. The single-ended version of the voltage controlled oscillator in its most basic form includes a load, two transistors, two delay elements, and a switchable current source. The first transistor includes a collector, an emitter and a base coupled to the load to form an output terminal for providing an oscillator output signal. The first delay element is connected between the collector and the base of the first transistor. The second transistor includes a collector, an emitter and a base connected to the base of the first transistor. The second delay element is connected between the collector of the first transistor and the collector of the second transistor. The switchable current source is connected to the emitters of the first and second transistors to provided a current to one of the transistors responsive to a control signal wherein the oscillator output signal has a first frequency of oscillation that is inversely proportional to the delay of the first transistor when the first transistor is turned on and a second frequency of oscillation inversely proportional to the sum of the first and second delay element delays when the second transistor is turned on.