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US 5,313,115 AGranted
Comparator
AssigneeCanon Kabushiki Kaisha
InventorYasushi Matsuno
Life of this patent
Estimating the term…
Abstract
A comparator comprises transistors to turn on/off an input terminal and a control circuit to enable the transistors in a high impedance input state. The high impedance input state can be detected by the above construction without additionally providing any wire and connector.
Claims2
A comparator comprising:
- a pair of transistors (Q.sub.4, Q.sub.5) connected to an input terminal (IN) to which an input signal is supplied and to an output terminal (OUT) for supplying an output signal, a base of one of the pair of transistors being connected to the input terminal, and a collector of the other of the pair of transistors being connected to the output terminal;
- a control circuit (Q.sub.1, Q.sub.2, Q.sub.3, I.sub.1) connected to the input terminal for controlling a potential of the input terminal responsive to a high impedance condition of the input terminal;
- and
- a circuit (Q.sub.8, Q.sub.9, Q.sub.10, I.sub.3) being identical with said control circuit, and being connected to one (Q.sub.5) of the pair of the transistors connected to said output terminal.
1 more element
Dependencies are inferred from the claim text.