| 摘要 |
PURPOSE:To improve the operating margin of a sense amplifier by connecting a constant current circuit in series with a starting transistor (TR) so as to make the operation of the constant current circuit independent of the power supply voltage thereby limiting the current from a latch signal line at starting to a constant value. CONSTITUTION:A TR Q5 whose 1st input/output terminal is connected to the latch signal line S and whose control terminal is connected to the 1st clock signal line P1 and a constant current circuit Q6 with a current control terminal inserted between the 2nd input/output terminal of the TR and the power supply line are provided and the 2nd clock signal line P2 is connected to the current control terminal. The depletion MOSFET Q6 is inserted between the source of the enhancement MOSFET Q5 and the ground power supply line and the gate is controlled by the clock signal P2 so as to allow the titled circuit to be operated stably with a constant current absorbing capability at starting and then to reach the high speed operation.
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