Question

resistor? 4. Explain why the differential signaling used in the CAN bus is more resistant to problems with the electrical noise in a car than the single-ended signaling used by the other buses.

Answer 1

Q.4 Answare is Here. Vsignal an Vsignal Vsignal Vsignal 7 Ground A) single-ended signaling single-ended signaling is a simple and common way of transmitting electrical signal from receiver. The electrical signal transmitted by voltage referenced to fixed potential usually ov node or ground! B) Differentical signaling sender to is voltage ( variable which is a VE It r 1- 2 5 Vsignal Vsignal I Ground = It-Ico Ground Vcm ( common mon mode volt) Vom ( Differential made VDM -(V+) -(V-)

single-ended Vaigh 1 6 Veogic Vlow Differential out 1 X-A XX L. Vom vº Ivan Ver It is less common than order SO one one carries the carries the Differential signalling av single- ended signaling it employs two complimentary voltage signals in to transmit one information signal signal requires a two conductors , signal and other inverted signal Reasons due to which Differential signaling is better than single. Ended signaling is No return current. no return current the ground reference dess important ground polential can be different at the sender of and receiver since we don't have becomes because

to need Howeaver we be careful because De compted differential signaling Cus By RS-485 shared CAND require ground potential. ji) Resistance to Incoming EMI and Cross talk. 97 EMIC electromagnetic interference) or Crosstalk is intro duced from outside, it is added equally to the inverted and non-inverted signal since reciever gets only difference in reciever circuitry wide the amplitude the interference voltage, thus reduce cross- talk . of ЕМІ. so iii) Reduction of Outgoing EMI - and cross talk Rapid transistion ( from bone rising and falling of signal) can generate significant amount of the differential pair creates Electromagnetic fields care equal in magnitude and oppossite in polarity. conjunction with techniques that maintain close proximity bw two conductors (twisted pair cable) ensures the cancellation of that This in noise .

very high ensure Because V Low voltage Operation single- ended signal maintains voltage to adequate signal-to-noise ratio ( SNR) [ Voltage 3.3v to 5v) of their improved resistance to noise differential signals can use lower voltage and still maintain Also, SNR is automatically increased by factor of two relative to single ended implementatiom. radiated EMI power consumption high frequency operation good SNR 97 reduces reduces Allow f