Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1992-07-20
1993-10-26
Pellinen, A. D.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341144, H03M 180
Patent
active
052570274
ABSTRACT:
A modified sign-magnitude DAC includes first internal DAC circuitry including a first number of bit switch circuits responsive to an input word including a sign bit and a digital data word. Each bit switch circuit is coupled to a corresponding current source transistor. Second internal DAC circuitry includes the same number of bit switch circuits responsive to the input word. Each bit switch circuit of the second internal DAC circuitry is coupled to a corresponding current source transistor. The same number of binarily weighted bit current determining resistor circuits corresponding to bits of the digital data word are connected to a reference voltage conductor. The emitter of the current source transistor of each bit switch circuit of the first internal DAC circuitry is coupled by a first gain balancing resistor to the corresponding bit current determining resistor. The emitters of the current source transistor of each bit switch circuit of the second internal DAC circuitry is connected by a second gain balancing resistor to the same corresponding bit current determining resistor. The sharing of the bit current determining resistor reduces the number required by half, and also reduces the physical size of each by half, since its resistance is halved for the same bit current magnitude.
REFERENCES:
patent: 3221323 (1965-11-01), Beck
patent: 4346368 (1982-08-01), Johnson
patent: 4473818 (1984-09-01), Youngquist
patent: 4490714 (1984-12-01), van de Plassche
patent: 4918447 (1990-04-01), Michel
patent: 4972188 (1990-11-01), Clement et al.
patent: 5017918 (1991-05-01), Matsusako
Burr-Brown Corporation
Pellinen A. D.
Young Brian K.
LandOfFree
Modified sign-magnitude DAC 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 Modified sign-magnitude DAC and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modified sign-magnitude DAC and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-962103