| 摘要 |
A data coupler comprises two CMOS drivers which are supplied with a data signal and a delayed version of the data signal to drive a primary winding of a transformer with narrow pulses of opposite polarity corresponding to respective edges of the data signal. A secondary winding of the transformer is coupled via a low pass filter to a data receiver, with a ground path for ac from one end of the secondary winding. The drivers are scaled with a ratio (N-1):(N+1), where the transformer has a primary-to-secondary turns ratio of N:1 and N is greater than one, to equalize voltage drops in the drivers due to consequent unequal common mode currents in the drivers.
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