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Circuit arrangement for signal coupling between circuit parts having supply lines isolated from one another

  • US 6,304,043 B1
  • Filed: 06/29/2000
  • Issued: 10/16/2001
  • Est. Priority Date: 07/01/1999
  • Status: Expired due to Fees
First Claim
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1. A circuit arrangement for signal coupling between circuit parts having supply lines isolated from one another, whereina) the circuit arrangement comprises a first circuit part (1) and at least one further circuit part (2), the first circuit part (1) being connected to a first supply line (3) having a first ground potential (GND1), and the other further circuit part(s) (2) being connected to a supply line (4) which is different than the first supply line (3) and has an associated second ground potential (GND2), the supply line (4) or the associated line for the ground potential (GND2) being connectable and disconnectable at least in one of said further circuit parts (2), b) there are one or more signal paths (6, 7, 8, 9) between the first circuit part (1) and the other further circuit part(s) (2), each of said signal paths (6, 7, 8, 9) containing a coupling capacitor (11, 12, 13, 14) for capacitively transmitting useful signals (N1, N2, N3, N4) between the first circuit part and the other circuit part(s), c) each said circuit part (1, 2) contains, on both sides of the coupling capacitors (11, 12, 13, 14), logic units (16, 17, 18, 19, 20, 21, 22, 23) for transmitting and receiving the useful signals (N1, N2, N3, N4) which are to be transmitted via the signal paths (6, 7, 8, 9), d) at least one of the circuit parts (1 or 2) contains a clock generator (15) which outputs a clock signal (TS) to the logic units (16, 17, 18, 19, 20, 21, 22, 23), and e) a useful signal (N1, N2, N3, N4) to be transmitted being logically combined with the clock signal (TS) in the logic units (16, 17, 18, 19, 20, 21, 22, 23) both at transmitter end and at receiver end using an EXCLUSIVE OR function in each case.

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