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:
Feb. 25, 2014
Filed:
Oct. 11, 2012
Teledyne Scientific & Imaging, Llc, Thousand Oaks, CA (US);
Myung-Jun Choe, Thousand Oaks, CA (US);
Kang-Jin Lee, Thousand Oaks, CA (US);
Munkyo Seo, Thousand Oaks, CA (US);
Teledyne Scientific & Imaging, LLC, Thousand Oaks, CA (US);
Abstract
A 'multiple return-to-zero' (MRZ) current switching DAC. In operation, the outputs of respective current sources are selectively directed to respective intermediate nodes in response to respective control signals which vary with a digital input word, and in synchronization with a clock CK1. A plurality of MRZ current switches are connected between respective intermediate nodes and the DAC's analog output. The MRZ switches are driven with a clock CK2 which toggles in synchronization with CK1 at a frequency f=N*f. The MRZ switches are operated such that switching noise that arises when CK1 is asserted is prevented from appearing on the analog output. When properly arranged, the DAC can generate a direct digital waveform at RF frequencies, with N chosen to produce an output spectrum such that the DAC's output power is relatively high within the desired frequency range.