Distributed architecture communication system having bus voltage compensation
First Claim
1. A distributed architecture system including multiple electronic modules that communicate with each other over a communication bus, including at least one electronic module that transmits messages over said communication bus by modulation of a bus current while receiving messages over said communication bus by de-modulation of a received bus voltage, the improvement comprising:
- compensation circuitry responsive to the modulation of the bus current by said at least one electronic module for increasing said received bus voltage by an amount that counteracts decreases in said received bus voltage due to said modulation of bus current.
4 Assignments
0 Petitions
Accused Products
Abstract
An improved distributed architecture system including multiple electronic modules that communicate with each other over a communication bus through concurrent modulation of bus current and bus voltage, wherein the bus voltage detected by a receiver in the remote module is compensated to ensure reliable reception of a voltage modulated bus communication despite the modulation of bus current by the remote module. A remote module is coupled to the communication bus via input resistors to provide resistive isolation from the bus in the event of a short circuit failure in the remote module, and a charge pump and current mirror circuit in the remote module produce a compensation voltage across a resistor coupling the receiver to the bus, with the compensation voltage substantially canceling the influence of bus current modulation on the received bus voltage.
-
Citations
5 Claims
-
1. A distributed architecture system including multiple electronic modules that communicate with each other over a communication bus, including at least one electronic module that transmits messages over said communication bus by modulation of a bus current while receiving messages over said communication bus by de-modulation of a received bus voltage, the improvement comprising:
compensation circuitry responsive to the modulation of the bus current by said at least one electronic module for increasing said received bus voltage by an amount that counteracts decreases in said received bus voltage due to said modulation of bus current. - View Dependent Claims (2, 3, 4, 5)
Specification