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CONVERTER OF DIGITAL DATA INTO ANALOGUE DATA

  • US 3,825,925 A
  • Filed: 04/10/1973
  • Issued: 07/23/1974
  • Est. Priority Date: 04/10/1972
  • Status: Expired due to Term
First Claim
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1. A device for converting signals representative of binary data into an alternating voltage representative of analogue data corresponding to said binary data, said device comprising:

  • a plurality of conversion networks, each having an input terminal adapted to receive one of the binary data signals, supply means adapted to be connected with a source of alternating current operating potential and having a pair of output supply terminals, and a transformer primary winding having first and second end terminals and a tap therebetween, one of said pair of supply terminals connected directly to said tap and the other of said pair of supply terminals connected to an inversing circuit;

    said inversing circuit connected with said input terminal and responsive to the binary state of the signals thereon for coupling said other supply terminal to one of said first and second end terminals, respectively, of said winding causing said winding to be supplied with an alternating current signal in phase synchronization or phase opposition, respectively, said inversing circuit including first and second semiconductor switching networks connected between said other supply terminal and said first and second winding end terminals, respectively, a control electrode of one of said networks connected directly with said input terminal and a control electrode of the other network connected to said input terminal through a phase inverter; and

    an output winding circuit electromagnetically coupled to said transformer primary windings of each of said conversion networks for providing a composite output analogue voltage having a component from each of said primary windings, said supply means and said primary and secondary windings cooperating to provide a different transformation weight for each conversion network corresponding to the binary weight of its associated binary data input signal.

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