Semiconductor integrated circuit device

A semiconductor integrated circuit device, comprising:

• an external connection terminal receiving an input signal from the outside;
• a differential amplifier circuit coupled to the external connection terminal;
• a first and a second transistor constituting the first differential input section and the second differential input section, respectively;
• a third transistor used as the tail current source of the first and second transistors;
• and
• a current detection section detecting a current flowing through the first transistor,
• wherein the differential amplifier circuit includes a first differential input section receiving the input signal from the external terminal, a second differential input section receiving a reference voltage, and a tail current source receiving a current of the first differential input section and a current of the second differential input section,
• wherein a current on the first differential input section side is detected and fed back to the tail current source so as to control a tail current flowing through the tail current source, and
• wherein the third transistor controls a current amount of the tail current in the tail current source based on a current which the current detection section detects.

A semiconductor integrated circuit device, comprising:

• a first external connection terminal receiving a first signal of differential signals;
• a second external connection terminal receiving a second signal that is an inverted signal of the first signal of the differential signals;
• a first differential amplifier circuit including a first differential input section receiving the first signal from the first external connection terminal and a second differential input section receiving a reference voltage, the first differential amplifier circuit carrying out a differential amplification of the first signal and the reference voltage;
• and
• a second differential amplifier circuit including a third differential input section receiving the second signal from the second external connection terminal and a fourth differential input section receiving the reference voltage, the second differential amplifier circuit carrying out a differential amplification of the second signal and the reference voltage,
• wherein the first differential amplifier circuit detects a current on the first differential input section side, and feeds this back to a first tail current source of the first differential amplifier circuit to control a tail current in the first tail current source, and
• wherein the second differential amplifier circuit detects a current on the third differential input section side, and feeds this back to a second tail current source of the second differential amplifier circuit to control the second tail current.

A semiconductor integrated circuit device, comprising:

• a first external connection terminal receiving a first signal of differential signals;
• a second external connection terminal receiving a second signal that is an inverted signal of the first signal of the differential signals;
• a first differential amplifier circuit including a first differential input section receiving the first signal from the first external connection terminal and a second differential input section receiving a reference voltage, the first differential amplifier circuit carrying out a differential amplification of the first signal and the reference voltage;
• and
• a second differential amplifier circuit including a third differential input section receiving the second signal from the second external connection terminal and a fourth differential input section receiving the reference voltage, the second differential amplifier circuit carrying out a differential amplification of the second signal and the reference voltage,
• wherein the first differential amplifier circuit includes a fifth and a sixth transistor constituting the first differential input section and the second differential input section, respectively, a seventh transistor coupled to the fifth and sixth transistors to constitute the first tail current source, and a first current detection section detecting a current flowing through the fifth transistor,
• wherein the seventh transistor controls a current amount of a tail current flowing through the seventh transistor based on the current which the first current detection section detects,
• wherein the second differential amplifier circuit includes an eighth and a ninth transistor constituting the third differential input section and the fourth differential input section, respectively, a tenth transistor coupled to the eighth transistor and the ninth transistor to constitute the second tail current source, and a second current detection section detecting a current flowing through the tenth transistor, and
• wherein the tenth transistor controls a current amount of a tail current flowing through the tenth transistor based on the current which the second current detection section detects.

A semiconductor integrated circuit device, comprising:

• an external connection terminal receiving an input signal from the outside;
• and
• a differential amplifier circuit coupled to the external connection terminal and including a first differential input section receiving an input signal from the external connection terminal, and a second differential input section receiving a reference voltage,
• wherein the differential amplifier circuit includes a first and a second load element, a first and a second input transistor, and a tail transistor,
• wherein gate terminal of the first input transistor is coupled to the first differential input section,
• wherein a gate terminal of the second input transistor is coupled to the second differential input section,
• wherein a drain terminal of the first input transistor and a first conduction terminal of the first load element are electrically coupled to each other,
• wherein a drain terminal of the second input transistor and a first conduction terminal of the second load element are electrically coupled to each other,
• wherein other end of a first resistor and other end of a second resistor are coupled to a first power supply line to which a first power supply voltage is supplied,
• wherein source terminals of the first and second input transistors are coupled to a second power supply line to which a second power supply voltage is supplied via the tail transistor,
• wherein one end of the first resistor is coupled to a gate terminal of the transistor, and
• wherein the external connection terminal is coupled to a memory chip that transfers data in synchronization with rising and falling of a clock signal.