Binarily weighted D to a converter ladder with inherently reduce

Details Binarily weighted D to a converter ladder with inherently reduce Binarily weighted D to a converter ladder with inherently reduce

1983-06-03

1986-04-01

Shoop, Jr., William M.

Communications: electrical

Audible indication

Percussion-type sound producer

H03M 100

Patent

active

045801312

ABSTRACT:
A digital to analog signal converter having a resistor ladder and switching network of the R-2R type is provided with the 2R resistor legs divided into two parallel 4R resistors, the most significant bit stage replaced with a switchable terminating 4R resistor stage, and logic means provided for each remaining bit stage responsive to its own bit stage input signal as well as the MSB stage signal such that, at the mid scale, the added 4R terminating resistor is switchable in and there is no switching at the other 4R resistor legs. By reducing the switching noise at the lowest input signal level, the system signal to noise ratio is substantially increased. To further reduce switching noise, additional bit stages may be replaced by terminating resistors and the 2R resistor legs appropriately modified.

REFERENCES:
patent: 3216001 (1965-11-01), Hinrichs
patent: 3588882 (1971-06-01), Propster
patent: 3735392 (1973-05-01), Kaneko
patent: 4318085 (1982-03-01), Whiteside et al.
patent: 4381499 (1983-04-01), Struthoff
patent: 4415883 (1983-11-01), von Sichart

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