Floating point digital to analog converter

Details Floating point digital to analog converter Floating point digital to analog converter

1996-06-17

1997-11-04

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341144, H03M 178

Patent

active

056844832

ABSTRACT:
A digital to analog converter (DAC) is shown which converts a floating point digital signal into an analog output. This is accomplishing by using one R-2R ladder network having more nodes than there are current generators to be connected to the nodes. The current generators representing the mantissa part of the digital signal are connected to the nodes of the single ladder network in a contiguous block arrangement and in order from the LSB to the MSB of the mantissa. The position of the block of current generators is controlled by the exponent part resulting in the proper scaling of the mantissa value in the output analog signal. Thus using fewer parts that must be accurately matched to provide a consistent accuracy and resolution over a wide range of input signal.

REFERENCES:
patent: 4177457 (1979-12-01), Howlett
patent: 4393369 (1983-07-01), Daries
patent: 4539883 (1985-09-01), Chihana
patent: 4727355 (1988-02-01), Kohdaka et al.
patent: 4951054 (1990-08-01), Kohdaka
patent: 5021785 (1991-06-01), Kohdaka et al.

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