| 主权项 |
1. A differential amplification circuit comprising:
a first transistor and a second transistor which form a differential pair; a first load and a second load which are connected between the drains of the first transistor and the second transistor, and one of power source lines, respectively; current sources which are connected between the sources of the first transistor and the second transistor, and the other of the power source lines, respectively; and a resistor circuit which is connected between the sources of the first transistor and the second transistor, wherein the resistor circuit includes:
a coarse adjustment part configured to change a resistance value of the resistor circuit in intervals equal to or greater than a first value; anda fine adjustment part configured to change the resistance value of the resistor circuit in intervals equal to or less than a second value, the second value being smaller than the first value, one of the coarse adjustment part and the fine adjustment part includes a first lateral adjustment part and a second lateral adjustment part which have the same circuit configuration, the first lateral adjustment part and the second lateral adjustment part are connected symmetrically to both sides of a central adjustment part, and are connected to the sources of the first transistor and the second transistor, respectively, the central adjustment part being the other of the coarse adjustment part and the fine adjustment part and at the same time, and the central adjustment part has a circuit configuration symmetrical with respect to two connection nodes with the first lateral adjustment part and the second lateral adjustment part. |
