Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2005-04-12
2005-04-12
Tokar, Michael (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
C341S153000
Reexamination Certificate
active
06879276
ABSTRACT:
A DAC (10) including an operational amplifier (12) having an input terminal; a plurality of current paths coupled to the input terminal; a plurality of current sources (I1/2 -I4/2); and an arrangement (11) for switchably coupling current from at least two of the cells to a respective one of the paths in response to an input signal. In a specific embodiment, the inventive DAC (10) further includes a first resistive element (2R1-2R4) disposed in each of the current paths, a second resistive element (R1-R4) disposed between the current paths, and a feedback resistor (RF) disposed between an output terminal of the amplifier and the input terminal thereof. In the illustrative embodiment, the coupling arrangement includes a plurality of switches (SW1-SW4); each of the switches is adapted to switch half of the current from a first source and half of the current from a second source into a respective one of the paths. The invention is adapted to lower the distortion of digital to analog converters by improving differential nonlinearities and integral nonlinearities, caused primarily by current source gradient errors, without the need for trimming.
REFERENCES:
patent: 5283580 (1994-02-01), Brooks et al.
patent: 5296857 (1994-03-01), Carobolante
patent: 5729231 (1998-03-01), Kikuchi
patent: 5825317 (1998-10-01), Anderson et al.
patent: 5920273 (1999-07-01), Hirano
patent: 6608577 (2003-08-01), Nishimura
patent: 6617989 (2003-09-01), Deak
Devendorf Don C.
Hirata Erick M.
Kosaka Roger N.
Langit Christopher B.
Linder Lloyd F.
Morrison & Foerster / LLP
Nguyen Linh V
TelASIC Communications, Inc.
Tokar Michael
LandOfFree
Split cell bowtie digital to analog converter and method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Split cell bowtie digital to analog converter and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Split cell bowtie digital to analog converter and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3417371