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. 29, 2001
Filed:
Jan. 21, 2000
Applicant:
Inventor:
Danish Ali, South Croydon, GB;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03B 5/02 ;
U.S. Cl.
CPC ...
H03B 5/02 ;
Abstract
A transmitter having an integratable quadrature oscillator network for simultaneously producing a sine wave and a cosine wave. The digital direction of rotation (whether the frequency is positive or negative) input is slow rate limited (R, C,) and fed into a low gm transconductor (MOS,MOS,) to softly switch between two pairs of transconductor amplifiers (TR,TR,and TR,TR,) which together with two capacitors (C,C,) form quadrature oscillators of opposite direction of rotation. By softly switching the quadrature oscillators out-of-band emissions are minimized in a subsequent mixing with a carrier signal to generate a frequency modulated signal.