To appropriately design the values of a settling time, mutual conductance, and capacitance by constituting the circuit by using a specific operational amplifier and a specific on-chip clock oscillator.
Two circuit has an operational amplifier, an on-chip clock oscillator which generates a clock signal, a capacitor K0, and a switch S0, and while the device operates through the operational amplifier clocked with the clock signal, the capacitor K0 is charged or discharged through it. Then a resistor and a frequency collaborative determination oscillator resistor, which determine the cutoff (dark) current and stationary current of the operational amplifier, are both actualized as the on-resistance of a MOS transistor which operates in a permanently conductive state. In the case of, for example, a current control clock oscillator, a resistor is a CMOS current mirror and includes a series circuit of transistors P1 and N1 and transistors P2 and N2.
ENVEC MESS UND REGELTECHN GMBH
GRIESHABER VEGA KG
KAVLICO CORP