| 摘要 |
A transmission circuit provides two outputs. The two outputs carry both signal information as a differential voltage and carry a signal as a common mode voltage. The differential voltage is sensed by a comparator. The common mode voltage is sensed by a single-ended amplifier. This transmission circuit is combined with another one so that the signal, which is carried as the common mode signal, is carried on the first pair of differential signals as well as a second pair of differential signals. Thus, one signal is carried as a differential signal on two lines, a third signal is carried as a differential signal on two additional lines, and the common mode signal is carried on all four lines. The first two lines provide the differential signal which is sensed by a comparator. The second pair of lines carries a differential signal which is sensed by another comparator. The first pair of lines is combined to provide a common mode signal. The second pair of lines is combined to provide a complementary common mode signal. The true and the complementary common mode signals are sensed by a comparator. Thus, four lines carry 3 differential signals which are all capable of high speed and may be synchronous or asynchronous.
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