| 摘要 |
<p>The multiplexer for differential signals comprises a plurality of channels, each channel having a pair of differential amplifiers (Q1, Q2, Q4, Q5) forming an input stage for receiving a differential input signal and a pair of output transistors (Q3, Q6) for forming an output stage producing a differential output signal. Each differential amplifier has a pair of emitter-coupled transistors, with each transistor having an additional emitter cross-coupled to the additional emitter of the opposite transistor of the other emitter-coupled pair. A plurality of current sources (I1-I2) are provided to bias the emitter-coupled and emitter cross-coupled pairs. By selectively enabling the current sources, the input signals forming the differential input signal can be applied with normal polarity or inverted polarity to a respective transistor of the output stage to produce a normal or inverted differential output signal or to both transistors of the output stage to produce no differential output signal.</p> |
