Research On Ultra High Speed Multiplexer (MUX) Integrated Circuit

Until now, there has been no research on MUX (multiplexer) over 10 Gb/s domesticly, which is a key chip in optical transceiver. In this paper, detailed research and discussion are made on the MUX over 10 Gb/s in system structures, device modeling, circuits design & simulation, chip test, etc.In this paper, different structures of MUX are analyzed and compared in detail, and then, a proper one of 2:1 or 4:1 MUX which is fitted to be used over 10 Gb/s, is discussed. Moreover, a MUX structure with the clock supplied by a frequency doubler is firstly presented.Some attentions for circuit's designer to the DC, AC, and large signal characteristics of GaAS PHEMT are pointed out and illustrated by OMMIC ED02AH technology. Micro strips, grounded coplanar waveguides, and coupled micro strips are also described in some depth for the use in ultra high speed integrated circuits.In this paper, a 2:1 MUX with the clock supplied by a frequency doubler are realized with OMMIC ED02AH technology and SCFL, and its test results verify this structure practicable. Furthermore, another 2:1 multiplexer (without frequency doubler), and frequency multiplier, are also realized independently with the same technology. The test results of the 2:1 multiplexer imply that this chip can work leastly at the speed of 24 Gb/s. For the chip of frequency multiplier, 2 and 16 times of frequency multiplier with 23 GHz output are both gotten by test.At last, by applying matching methods usually used in the fields of RF (Radio Frequency) and MW (Microwave) circuits, a selector is designed with OMMIC D01PH technology. This chip can function well at the speed of 80, 90, and 100 Gb/s.In conclusion, many creative works have been done in this paper.