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

• Current Assignee: Gaston Joseph Drusch
• Original Assignee: Gaston Joseph Drusch
• Inventors: Drusch, Gaston Joseph
• Primary Examiner(s): Sloyan, Thomas J.
• Application Number:
  US05/349,864
• Time in Patent Office: 469 Days
• Field of Search: 340/347DA,347SY 336/137,143
• US Class Current: 341/149
• CPC Class Codes: H03M 1/00 Analogue/digital conversion; Digital/analogue conversion conversion of analogue values to or from differential modulation H03M3/00
• CPC Class Codes: H03M 1/08 of noise H03M1/0617 takes precedence

Abstract

The present device includes a number of networks each having an analogue output corresponding to the weight of a digital signal applied to an input terminal thereof. The inputs are connected to respective outputs of a digital source, and the outputs of the networks are connected in series for applying an analogue version of the complete digital input signal to a receiving device.

Claims

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.

2. A device as set forth in claim 1 wherein said supply means of each of said conversion networks comprises a transformer circuit having a transformation ratio proportional to the given weight of its associated binary data input signal.

3. A device as set forth in claim 2 wherein said transformer circuit includes a common primary winding connected to a source of alternating current and a common secondary winding having a plurality of taps connected, respectively, to each of said conversion networks and positioned to establish the appropriate transformation ratio for each of said networks.

4. A device as set forth in claim 1 wherein said supply means comprises a direct connection of said pair of supply terminals to a source of alternating current operating potential, and wherein the transformation ratio between each said primary winding and said secondary transformer winding is weighted in proportion to a given weight of its associated binary data input signal.

5. A device as set forth in claim 4 wherein each conversion network comprises a primary winding having the same number of turns, and wherein said primary windings and said secondary windings are coupled by a magnetic circuit having plural sections each proportional to the given weight of a binary input data signal.

6. A device as set forth in claim 1 wherein each of said semi-conductor switching networks comprises first and second triacs;

the anode electrode of said first triac connected with the control electrode of said second triac through a diode bridge and further connected to one end terminal of said priMary winding;

the anode of said second triac connected with the other end terminal of said primary winding;

the cathodes of both triacs connected with said supply means; and

the control electride of said first triac coupled with said input terminal.

7. A device as set forth in claim 1 wherein each of said semi-conductor switching networks comprises a triac and a pair of controlled solid state switches.

8. A device as set forth in claim 7 wherein said solid state switches comprise transistor devices.

9. A device as set forth in claim 8 wherein said transistors of each pair are of opposite conductivity type.

10. A device as set forth in claim 7 wherein said solid state switches comprise thyristor devices.

11. A device as set forth in claim 1 further including means connecting said output transformer winding in series with said source of alternating current.