摘要:
A binary DC balanced code and an encoder circuit for producing such code is described, which translates an 8 bit byte of information into 10 binary digits for transmission over electromagnetic or optical transmission lines subject to timing and low frequency constraints. The significance of this code is that it combines a low circuit count for implementation with excellent performance near the theoretical limits, when measured with the commonly accepted criteria. The 8B/10B coder (12,14,16,18) is partitioned into a 5B/6B (12) and 3B/4B (14) coder. The input code points are assigned to the output code points so the number of bit changes required for translation is minimized and can be grouped into a few classes.
摘要:
A binary DC balanced code and an encoder circuit for producing such code is described, which translates an 8 bit byte of information into 10 binary digits for transmission over electromagnetic or optical transmission lines subject to timing and low frequency constraints. The significance of this code is that it combines a low circuit count for implementation with excellent performance near the theoretical limits, when measured with the commonly accepted criteria. The 8B/10B coder (12,14,16,18) is partitioned into a 5B/6B (12) and 3B/4B (14) coder. The input code points are assigned to the output code points so the number of bit changes required for translation is minimized and can be grouped into a few classes.
摘要:
Each cascaded amplifier stage comprises two input transistors (118, 120) and two control transistors (110, 112) respectively supplied with bias voltage V and bias current I. The differential current flowing through transistors (118,120) is amplified by each stage. By connecting diode loads, (D1 D2); (D3, D4) and (D5, D6) in the connections between the emitters of transistors (118', 120') and the base collector connections of transistors (110'/112') and (120'/110) etc., the amplification in each stage is increased so that the differential current is amplified at a higher rate than the proportion of 12:11; 13:12 etc.