Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1986-04-18
1988-06-14
Shoop, Jr., William M.
Communications: electrical
Audible indication
Percussion-type sound producer
H03M 178
Patent
active
047514973
ABSTRACT:
The disclosure relates to a digital to analog converter capable of suppressing "glitches" or transient spikes in the analog output signal. The digital to analog converter includes a plurality of current switches corresponding to the number of digital input bit signals and a resistive ladder of the conventional R-2R configuration. The R-2R ladder network has a plurality of input ports each connected to the output of a corresponding current switch. Logic inputs to the current switches determine which of the current switches are to be turned on to supply reference currents to corresponding input ports of the ladder network which in turn decrements the received reference currents by a factor of 2 as they pass through each stage to provide an analog output signal at the output terminal of the converter. To improve the accuracy of D/A conversion of the invention, compensating capacitors affording delay time equalization are provided for the least and most significant bit positions as well as between each two adjacent bit positions. These compensating capacitors operate to compensate for the stray capacitance of each current switch due to the parasitic collector-base capacitance of switching transistors to thereby equalize the impedance of the ladder network as viewed from each input port of the ladder network to the output terminal of the converter.
REFERENCES:
patent: 3579023 (1971-05-01), Fox
Blum Richard K.
Iwatsu Electric Co. Ltd.
Shoop Jr. William M.
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