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:
Apr. 27, 2021
Filed:
Jan. 21, 2020
Blue Danube Systems, Inc., New Providence, NJ (US);
Giovanni Marzin, Springfield, NJ (US);
Yiping Feng, Skillman, NJ (US);
Blue Danube Systems, Inc., New Providence, NJ (US);
Abstract
A method for initializing a phase adder circuit including a multiplier circuit with its two inputs receiving signals of frequency f, a mixer circuit, an amplifier circuit, a low pass loop filter, and a voltage controlled oscillator (VCO), the method including: during a first phase, determining a reference voltage which when applied to the VCO causes it to produce a signal having a frequency of nf; during a second phase, supplying a signal of frequency nfto a first input of the mixer and a signal of frequency (nf+Δf) to a second input of the mixer; and determining an adjustment signal which when applied to the amplifier circuit causes the amplifier circuit to output a signal having a DC component equal to the reference voltage; and during a third phase, forming a primary phase locked loop (PLL) circuit including the mixer, the amplifier circuit, the low pass loop filter and the VCO; and applying the adjustment signal to the amplifier circuit.