H - Electricity – 03 – M
Patent
H - Electricity
03
M
354/67
H03M 7/00 (2006.01) H04B 3/00 (2006.01) H04B 10/12 (2006.01) H04L 25/49 (2006.01)
Patent
CA 2007369
ABSTRACT OF THE DISCLOSURE A high bandwidth signal may be transmitted on a coaxial cable and accurately decoded by providing at the receiving end a receiving circuit which is not sensitive to the amplitude of a received signal, but is responsive only to the time at which transition of the signal occurs. In this decoding method, signals meeting the requirement are provided by differentiating the receiving signal which is transmitted in a code wherein zeros are indicated by a lack of transition, and ones are indicated by a transition, the differentiation providing an indication of the time at which the transition occurs. The signal which was origi- nally transmitted is reconstructed by comparing the signal which is received at the end of the coaxial cable, with a signal received at a time T+.DELTA.T, in a standard differential comparator. The actual comparison can be expressed as VOUT(T) = K1*(VIN(T) - K2*Vin(T) - AT). In this expression VIN is the received signal at the end of the serial cable, and VOUT is the signal provided to the receiver chip for decoding. K1 is the gain of the differential comparator, which is a standard chip. K2 is defined by the ratio of a pair of series connected resistors connected between one end of a delay line having a characteristic delay .DELTA.T and ground. The connecting point between the two resisters is connected to one input of the comparator, the other input of the comparator being connected directly to the serial cable output. By choosing the sum of the two resistors to be equal to the characteristic line impedance of the coaxial cable, these resistors also provide the desired termination impedance for the cable. The output of the comparator is connected directly to the receiver chip. A-49228/TOH/JAS
Digital Equipment Corporation
Smart & Biggar
Thacker Charles P.
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