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:
Nov. 08, 2016
Filed:
Jul. 13, 2015
Lattice Semiconductor Corporation, Hillsboro, OR (US);
Vinh Ho, Milpitas, CA (US);
Magathi Jayaram, San Jose, CA (US);
Hamid Ghezel, Santa Cruz, CA (US);
David Li, San Jose, CA (US);
LATTICE SEMICONDUCTOR CORPORATION, Portland, OR (US);
Abstract
In one embodiment, a voltage-controlled oscillator has a ring of delay stages and power-regulating circuitry regulating power to each delay stage. Each delay stage has at least one inverter having a leg having a current regulator that controls current flowing through the leg and thereby controlling gain of the delay stage. The VCO receives three control signals that affect the amount of delay applied by each delay stage and therefore the VCO output frequency: a first applied to control the power-regulating circuitry, a second applied to at least one transistor gate in the current regulator, and a third applied to at least one transistor body in the current regulator. The power-regulating circuitry has a parallel configuration of a power-regulating transistor, a first capacitor, and a switched-capacitor leg having a second capacitor and a switch for controlling settling time. The capacitors regulate the power supply without a dedicated, opamp-based voltage regulator.