Method and apparatus converting digital signals to analog signals and simultaneous transmission of AC power and signals over wire conductors

• US 5,065,133 A
• Filed: 08/25/1989
• Issued: 11/12/1991
• Est. Priority Date: 08/25/1989
• Status: Expired due to Fees

• Current Assignee: Siemon Company The (The Siemon Company Incorporated)
• Original Assignee: The Siemon Company Incorporated
• Inventors: Howard, Gary
• Primary Examiner(s): Ng, Jin F.
• Assistant Examiner(s): Jackson, Jill
• Application Number:
  US07/398,784
• Time in Patent Office: 809 Days
• Field of Search: 375/35, 375/36, 375/17, 375/49, 370/44, 340/310 A, 340/310 R
• US Class Current: 375/258
• CPC Class Codes: H04L 12/10 Current supply arrangements
• CPC Class Codes: H04L 25/03127 using only passive components H04L25/03121 takes precedence

Abstract

A method and apparatus for enhancing digital signal transmission is provided for (1) converting a digital signal to an enhanced analog signal having a specified polarity and angular velocity; (2) transmitting that enhanced analog signal from one electronic component to another electronic component; and (3) converting the enhanced analog signal back to a reconstituted digital signal. The enhanced analog signal comprises a smooth non-periodic function of voltage, current and time which preferably has the waveform of a versine function signal with specified polarity. A method of supplying power to remote locations of the apparatus for enhancing digital signals is also presented.

Claims

1. A method of enhancing digital signal transmission over at least two pairs of twisted pair wire conductors defining a transmitting pair and a receiving pair, comprising the steps of:

(1) converting a digital signal to an analog signal having a specified angular velocity and a specified polarity to define an enhanced analog signal comprising a waveform generated from a smooth function of voltage, current and time;

(2) transmitting said enhanced analog signal over said transmitting pair with said enhanced analog signal being received by said receiving pair;

(3) tuning said enhanced analog signal on said transmitting pair to a first angular velocity;

(4) tuning said enhanced analog signal on said receiving pair to a second angular velocity; and

(5) reconverting said enhanced analog signal back to said digital signal.

2. The method of claim 1 including:

converting said digital signal to said enhanced analog signal at each state transition of said digital signal.

3. The method of claim 1 wherein:

said smooth function comprises a selected function wherein one selected frequency component prevails.

4. The method of claim 1 wherein:

said smooth function comprises a non-periodic versine function.

5. The method of claim 4 including:

converting said digital signal to said enhanced analog signal at each state transition of said digital signal.

6. The method of claim 5 wherein said versine function is characterized by the following equations for low-to-high digital state transitions (V_p) and for high-to-low digital state transitions (V_n):

##EQU4## where τ

=the period of the full-cycle versine;

t=time; and

t is limited to the domain;

≦

t≦

τ

.

7. A method of enhancing digital signal transmission comprising the steps of:

(1) converting a digital signal to an analog signal having a specified angular velocity and a specified polarity to define an enhanced analog signal comprising a waveform generated from a smooth function of voltage, current and time;

(2) transmitting said enhanced analog signal on at least one pair of unshielded twisted pair wire conductors;

(3) coupling AC power at a selected frequency onto said at least one pair of twisted pair wire conductors; and

(4) reconverting said enhanced analog signal back to said digital signal.

8. A method of enhancing digital signal transmission over at least two pairs of twisted pair wire conductors defining a transmitting pair and a receiving pair, comprising the steps of:

(1) converting a digital signal to an analog signal having a specified angular velocity and a specified polarity to define an enhanced analog signal comprising a waveform generated from a smooth function of voltage, current and time;

(2) transmitting said enhanced analog signal over said transmitting pair with said enhanced analog signal being received by said receiving pair;

(3) coupling AC power at a selected frequency onto each pair of said at least two pairs of twisted pair wire conductors; and

(4) reconverting said enhanced analog signal back to said digital signal.

9. The method of claim 8 wherein each of said pairs of twisted pair wire conductors is associated with a transformer and wherein said step of coupling AC power includes:

using transformer center tap means driven differentially to common mode couple the AC power onto each transformer associated with each pair of said at least two pairs of twisted pair wire conductors.

10. The method of claim 8 wherein each of said pairs of twisted pair wire conductors is associated with a transformer and wherein said step of coupling AC power includes:

using series capacitor means to capacitively couple the AC power onto each transformer associated with each of said at least two pairs of twisted pair wire conductors.

11. A device for enhancing digital signal transmission over at least two pairs of twisted pair wire conductors defining a transmitting pair and a receiving pair, comprising:

(1) first converting means for converting a digital signal to an analog signal having a specified angular velocity and a specified polarity to define an enhanced analog signal comprising a waveform generated from a smooth function of voltage, current and time;

(2) transmitting means for transmitting said enhanced analog signal over said transmitting pair with said enhanced analog signal being received by said receiving pair;

(3) first tuning means for tuning said enhanced analog signal on said transmitting pair to a first angular velocity; and

(4) second tuning means for tuning said enhanced analog signal on said receiving pair to a second angular velocity; and

(5) second converting means for reconverting said enhanced analog signal back to said digital signal.

12. The device of claim 11 wherein:

said first converting means includes means for converting said digital signal to said enhanced analog signal at each state transition of said digital signal.

13. The device of claim 11 wherein:

said smooth function comprises a selected function wherein one selected frequency component prevails.

14. The device of claim 11 wherein said first converting means comprises:

differential receiver means for receiving digital signal input;

first transistor means connected to said differential receiver means;

first inductor means connected to said first transistor means;

first capacitor means connected to said inductor means, said first inductor means and said first capacitor means being tuned for resonance at said specified angular velocity;

first resistor means connected to said first capacitor means;

second transistor means connected to said first resistor means;

second resistor means connected to said second transistor means; and

transformer means connected to said second resistor, said transformer means coupling said enhanced analog signal to said at least two pairs of twisted pair wire conductors.

15. The device of claim 11 wherein said second converting means comprises:

transformer means for coupling said enhanced analog signal from said at least two pairs of twisted pair wire conductors;

first capacitor means connected to said transformer means;

first inductor means connected to said first capacitor means;

first resistor means connected to said first inductor means;

amplifier means connected to said first resistor means;

second resistor means connected to said amplifier means;

voltage comparator means connected to said second resistor means;

means for establishing hysteresis associated with said voltage comparator means and changing said enhanced analog signal to a digital signal;

third resistor means connected to said voltage comparator means; and

differential transmitter means connected to said third resistor means for transmitting the digital signal.

16. The device of claim 15 wherein said amplifier means comprises:

transistor means connected between said first and second resistor means;

fourth resistor means connected between said transistor means and said first resistor means;

fifth resistor means connected between said transistor means and said second resistor means;

voltage divider means connected between said fourth and fifth resistor means; and

second capacitor means connected between said fourth resistor means and said voltage divider means.

17. The device of claim 11 wherein:

said smooth function comprises a non-periodic versine function.

18. The device of claim 17 wherein:

said first converting means includes means for converting said digital signal to said enhanced analog signal at each state transition of said digital signal.

19. The device of claim 18 wherein said versine function is characterized by the following equations for low-to-high digital state transitions (V_p) and for high-to-low digital state transitions (V_n):

##EQU5## where τ

=the period of the full-cycle versine;

t=time; and

t is limited to the domain;

≦

t≦

τ

.

20. A device for enhancing digital signal transmissions comprising:

(1) first converting means for converting a digital signal to an analog signal having a specified angular velocity and a specified polarity to define an enhanced analog signal comprising a waveform generated from a smooth function of voltage, current and time;

(2) transmitting means for transmitting said enhanced analog signal on at least one pair of unshielded twisted pair wire conductors;

(3) means for coupling AC power at a selected frequency onto said at least one pair of twisted pair wire conductors; and

(4) second converting means for reconverting said enhanced analog signal back to said digital signal.

21. A device for enhancing digital signal transmission over at least two pairs of twisted pair wire conductors defining a transmitting pair and a receiving pair, comprising:

(1) first converting means for converting a digital signal to an analog signal having a specified angular velocity and a specified polarity to define an enhanced analog signal comprising a waveform generated from a smooth function of voltage, current and time;

(2) transmitting means for transmitting said enhanced analog signal over said transmitting pair with said enhanced analog signal being received by said receiving pair;

(3) means for coupling AC power at a selected frequency onto each pair of said at least two pairs of twisted pair wire conductors; and

(4) second converting means for reconverting said enhanced analog signal back to said digital signal.

22. The device of claim 21 wherein each of said pairs of twisted pair wire conductors is associated with a transformer and wherein said coupling means includes:

center tap transformer means driven differentially to common mode couple the AC power onto each transformer associated with each pair of said at least two pairs of twisted pair wire conductors.

23. The device of claim 21 wherein each of said pairs of twisted pair wire conductors is associated with a transformer and wherein said coupling means includes:

series capacitor means to capacitively couple AC power onto each transformer associated with each of said at least two pairs of twisted pair wire conductors.

24. A method for transmitting AC power over wire conductors to remote electronic devices simultaneously with the transmission of signals over the same wire conductors comprising the step of:

coupling AC power at a selected frequency onto the wire conductors;

wherein the wire conductors include at least two pairs of twisted pair wire conductors and wherein each of said pairs of twisted pair wire conductors is associated with a transformer and wherein said step of coupling AC power includes;

using transformer center tap means driven differentially to common mode couple the AC power onto each transformer associated with each pair of said at least two pairs of twisted pair wire conductors.

25. A method for transmitting AC power over wire conductors to remote electronic devices simultaneously with the transmission of signals over the same wire conductors comprising the step of:

coupling AC power at a selected frequency onto the wire conductors;

wherein the wire conductors include at least two pairs of twisted pair wire conductors and wherein each of said pairs of twisted pair wire conductors is associated with a transformer and wherein said step of coupling AC power includes;

using series capacitor means to capacitively couple the AC power onto each transformer associated with each of said at least two pairs of twisted pair wire conductors.

26. A device for transmitting AC power over wire conductors to remote electronic devices simultaneously with the transmission of signals over the same wire conductors comprising:

coupling means for coupling AC power at a selected frequency onto the wire conductors;

wherein the wire conductors include at least two pairs of twisted pair wire conductors and wherein each of said pairs of twisted pair wire conductors is associated with a transformer and wherein said coupling means includes;

center tap transformer means driven differentially to common mode couple the AC power onto each transformer associated with each pair of said at least two pairs of twisted pair wire conductors.

27. A device for transmitting AC power over wire conductors to remote electronic devices simultaneously with the transmission of signals over the same wire conductors comprising:

coupling means for coupling AC power at a selected frequency onto the wire conductors;

wherein the wire conductors include at least two pairs of twisted pair wire conductors and wherein each of said pairs of twisted pair wire conductors is associated with a transformer and wherein said coupling means includes;

series capacitor means to capacitively couple AC power onto each transformer associated with each of said at least two pairs of twisted pair wire conductors.