| 摘要 |
PURPOSE: To simplify the configuration by detecting the presence of a negative charge on a gate so as to generate a signal corresponding to a programmed state for a transistor(TR) pair. CONSTITUTION: A pair of programmable TRs 1, 2 functions in a mode similar to that of floating gate electronic avalanche injection MOS TRs. A strong coupling of a voltage of a programming voltage source Vpp with respect to a gate of the TR 2 is obtained by selecting a counter channel static capacitance, that is, a capacitance range of a gate of a P-channel TR 1 to be higher than a counter channel static capacitance, that is, a capacitance range of entire gates in combination with TRs 2-4. Detection means 3-5 detect the presence/ absence of a negative charge on a common gate of the programmable pair TRs 1, 2. Thus, the increase in the cost and the man-hours resulting form the floating gate configuration is avoided. |
