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:
Sep. 10, 2019
Filed:
Mar. 02, 2017
Applicant:
Spreadtrum Communications Usa Inc., San Diego, CA (US);
Inventors:
Aram Akhavan, La Jolla, CA (US);
Daniel Ralston, La Jolla, CA (US);
Assignee:
SPREADTRUM COMMUNICATIONS USA INC., San Diego, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03B 5/36 (2006.01); H03L 7/00 (2006.01);
U.S. Cl.
CPC ...
H03B 5/364 (2013.01); H03B 5/362 (2013.01); H03L 7/00 (2013.01); H03B 2200/0082 (2013.01);
Abstract
A low-power crystal oscillator circuit operating in Class B includes a PMOS transistor, an NMOS transistor, a step-down voltage regulator, and a bias voltage generator. A feedback mechanism includes an inverter whose input is connected to the drains of the PMOS and NMOS transistors and whose output is capacitively coupled to the gate of the PMOS transistor to provide positive feedback.