| 摘要 |
PROBLEM TO BE SOLVED: To provide a differential amplification circuit that can operate at higher speed and on lower power than the prior art.SOLUTION: The differential amplification circuit having a differential operational amplifier including a differential pair circuit and operating on a constant bias current supplied from a bias current source circuit includes: a bias current generation circuit including a current monitor circuit for detecting two currents flowing through the differential pair circuit in response to differential input voltages input into the differential pair circuit, and detecting the lower of the two currents as a monitor current for a differential voltage of the differential input voltages, a current comparison circuit for comparing the monitor current with the constant bias current supplied from the bias current source circuit, and outputting a voltage corresponding to the result of comparison, and a current amplification circuit for amplifying the voltage corresponding to the result of comparison, and controlling a current flowing to the differential pair circuit on the basis of the amplified voltage. The bias current generation circuit performs negative feedback adaptive control such that the bias current flowing to the differential pair circuit increases with decreasing monitor current. |
