Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1990-12-04
1992-12-08
LaRoche, Eugene R.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307360, 3072965, H03K 5153, H03K 500
Patent
active
051700760
ABSTRACT:
A threshold comparator counts the instances when an alternating periodic signal crosses a level. To prevent false counts due to fluctuations in supply and ground potentials, a dual threshold comparator is constituted by a first inverter and a second inverter receiving the signal to be detected through a capacitor. The connected inputs of these inverters are biased by a source of bias voltage (Vbias) provided by a third inverter, the output of which is looped to the input. The geometries of the transistors of these three inverters are chosen as follows: the ratio between the geometries of the two transistors of the first inverter is slightly different from the corresponding ratio for the second inverter, and the ratio for the third inverter is in between the first two ratios. This makes it possible to have two change-over thresholds which are close to each other and make the comparator immune to noise.
REFERENCES:
patent: 3768024 (1973-10-01), Letosky
patent: 4326136 (1982-04-01), Le Can et al.
patent: 4356481 (1982-10-01), Kuki
patent: 4521696 (1985-06-01), Raghunathan
patent: 4571504 (1986-02-01), Iwamoto et al.
patent: 4794283 (1988-12-01), Allen et al.
LaRoche Eugene R.
Lester Evelyn A.
SGS-Thomson Microelectronics S.A.
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