| 摘要 |
PROBLEM TO BE SOLVED: To reduce an undesired change in a frequency characteristic of a built-in filter. SOLUTION: A semiconductor integrated circuit includes a proofreading circuit 200, and a built-in capacitor element 70:151 has a plurality of capacitor elements and switches. V-I converters 20 and 30 convert reference voltage into current, and time integrators 40 and 50 responding to current execute time integration of charging or discharging of a capacitor element 70, and a voltage comparator 80 compares the reference voltage with terminal voltage of the built-in capacitor element 70. Time integration of a plurality of times and voltage comparison of a plurality of times are sequentially carried out during proofreading operation, and sequentially generated results of the voltage comparison of the plurality of times are sequentially stored in a latch 90. Each on-off control of the plurality of switches of the built-in capacitor element 70:151 and a frequency characteristic of a built-in filter 150 are determined according to a storage result of the latch when the proofreading operation is completed. The V-I converters include a switch element SWO. The plurality of switches of the built-in capacitor element 70: 151 and the switch element of the V-I converters are an MOS transistor. COPYRIGHT: (C)2010,JPO&INPIT
|
