| 摘要 |
A tripler for multiplying three input signals operable at a low power source voltage such as 3 V or less, which contains a first emitter-coupled pair of first and second bipolar transistors, a second emitter-coupled pair of third and fourth bipolar transistors, and a multiplier. Collectors of the first and third transistors are coupled together and those of the second and fourth transistors are coupled together. A tripler output is derived from the collectors coupled of the first and third transistors and those of the second and fourth transistors. Bases of the first and fourth transistors are coupled together and those of the second and third transistors are coupled together. A first input voltage is applied across the bases coupled of the first and is fourth transistors and those of the second and third transistors. The multiplier has a second pair of input ends to be applied with a second input voltage, a third pair of input ends to be applied with a third input voltage, and a pair of output ends from which a differential output current of the multiplier is derived. The first and second emitter-coupled pairs are driven by the differential output current of the multiplier.
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