Differential amplifier
AssigneeFujitsu Limited
InventorsAkiyoshi Matsuda, Tsunehiko Moriuchi, Hiroko Haraguchi
Life of this patent
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Abstract
A differential amplifier of the present invention comprises transistors where to each of which one of two inputs to said differential amplifier is provided; current mirror circuits where each of which delivers one of the outputs of the differential amplifier to the load side; and cut-off prevention units where each of which is connected to the connecting point of a transistor to which a monitor current of one of the current mirror circuits flows, and one of the transistors to which the inputs are provided, and applies a current for preventing cutting off the transistor to which the monitor current flows, when the input to the transistor to which the input is provided is L.
Claims37
A differential amplifier, comprising:
- a first and second transistor to which the inputs to the differential amplifier are respectively provided and
- first and second current sources each connected between a ground and each terminal of said first and second transistors which provides the output point of said differential amplifier.
A differential amplifier, comprising:
- a first and second transistor to which the inputs to the differential amplifier are respectively provided and
- a circuit element connected between the terminals of said first and second transistors which provide the output point of said differential amplifier.
A differential amplifier, comprising:
- two transistors which constitute the differential amplifier and which are connected to each terminal which can be the output point for the differential amplifier among the terminals of each transistor to which one of the two inputs for the differential amplifier is provided, and one of which turns off when the other is on, and one of which turns on when the other is off;
- and
- the current source connected between the two transistors and the grounding wires.
A differential amplifier, comprising:
- a transistor which constitutes the differential amplifier and to which one of two inputs to the differential amplifier is provided;
- and
- a cut-off prevention device which is connected to the connecting point of the transistor to which a monitor current of the current mirror circuit flows to deliver the output of the differential amplifier to the load side and which makes the current flow which does not cut off the transistor to which the monitor current flows even when the input to the transistor to which the input is provided is L.
A differential amplifier, comprising:
- two transistors, which are respectively connected to terminals which can be output points of the differential amplifier, out of the terminals of each transistor to which one of two inputs to the differential amplifier is provided, where both of them constitute the differential amplifier, wherein
- said two transistors are turned on when the input applied to said connected transistor which has a terminal which can be the output point of said differential amplifier is L and turned off when the input is H;
- and further comprising:
- a current source which is connected between said two transistors and the grounding wires.
A differential amplifier comprising:
- transistors where both of which constitute said differential amplifier and to each of which one of two inputs to said differential amplifier is provided, respectively;
- current mirror circuits where each of which delivers one of the outputs of the differential amplifier to the load side;
- and
- cut-off prevention units where each of which is connected to the connecting point of a transistor to which a monitor current of one of the current mirror circuits flows, and one of the transistors to which the inputs are provided, and apply a current to prevent cutting off the transistor to which the monitor current flows, only when the input to the transistor to which the input is provided is L.
Dependencies are inferred from the claim text.