| 摘要 |
PURPOSE:To contrive the attainment of a stable operation by connecting a common connection emitter (node) of two sets of differential transistors (TRs) being components of an emitter coupling logic (ECL) FF circuit to a prescribed potential point via a leakage resistor. CONSTITUTION:A resistor RL is provided between emitters of common connection of differential transistors T1, T2 of the ECLFF circuit, that is, nodes n1, n2. Parasitic capacitance exists between the nodes n1, n1 and ground and when TRs 3, 6 are transited alternately by a clock CK, the collector current of the TRs 1, 2 or 4, 5 in the on-state is changed. Thus, the base-emitter voltage VBE of the TRs 1, 2 or TRs 4, 5 in the on-state is changed and the parasitic capacitance, i.e., the potential of the nodes n1, n2 tends to be changed, but its change is suppressed by the presence of the RL. Thus, the charge/discharge current of the parasitic capacitance is decreased, the AC noise caused thereby is suppressed and the operation of the ECLFF circuit is stabilized.
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