Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1990-06-18
1992-03-24
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
3072962, 3072968, 307354, 307491, 307359, 307362, H03K 524, H03K 5153
Patent
active
050991469
ABSTRACT:
In a controlled threshold type electric device having first and second transistors and a differential amplifier which receives a reference input voltage, a voltage corresponding to the threshold voltage of the first transistor itself is applied to the differential amplifier as a feedback input voltage. The differential amplifier compares the received feed back input voltage with the reference input voltage and applies a control voltage to the backgate of the first transistor so that the threshold value of the first transistor converges to a desired value. This control voltage is also applied to the backgate of the second transistor so that the threshold voltage of the second transistor also converges to a desired value. Since the voltage corresponding to the threshold value of the first transistor is applied to the differential amplifier, an accurate feed back control is made. Further, since the differential amplifier can be manufactured through the MOS standard process, the manufacturing cost can be reduced.
REFERENCES:
patent: 4791318 (1988-12-01), Lewis et al.
H. N. Leighton, "Back Gate Control Circuits", IBM Technical Disclosure Bulletin, vol. 27, No. 6, Nov. 1984, pp. 3607-3608.
Hosotani Shiro
Kumamoto Toshio
Miki Takahiro
Mitsubishi Denki & Kabushiki Kaisha
Zazworsky John
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