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:
Mar. 18, 2003
Filed:
Feb. 02, 2001
James Maligeorgos, Austin, TX (US);
Other;
Abstract
A frequency multiplication circuit is disclosed. The circuit includes a ring oscillator formed of an even number of phase shifting stages. Each phase shifting stage provides a high frequency output comprised of harmonics of the oscillation frequency of the oscillator. An input signal having a first frequency is injected into a feedback node of the oscillator, thereby injection locking the oscillator to the input signal such that the oscillation frequency of the oscillator is equal to the first frequency. An output signal is extracted from two of the phase shifting stages. One of the harmonic frequencies may be isolated in the output signal, thereby providing a clean output at a multiple of the input frequency. When the circuit is operated at high frequencies, the output signal consists substantially of the second harmonic frequency and the circuit operates as a frequency doubler. A pair of frequency doublers may be cascaded to form a frequency quadrupler capable of providing an output signal with a frequency greater than 10 GHz.