Patent ID: 8564258

Claim:
A semiconductor integrated circuit configured to control a MEMS-type variable capacitance capacitor having primary electrodes with a MEMS structure for frequency modulation and auxiliary electrodes for changing a distance between the primary electrodes to change the capacitor's electrostatic capacitance, the semiconductor integrated circuit comprising: a first pump circuit configured to generate a first voltage for decreasing the distance between the primary electrodes; a second pump circuit configured to generate a second voltage for keeping the distance between the primary electrodes constant and having first supplying capacity; and a third pump circuit configured to generate the second voltage and having second supplying capacity lower than the first supplying capacity, wherein, when a supplying voltage of the first pump circuit reaches the first voltage and a deformation of the MEMS-type variable capacitance capacitor stops, the second voltage is supplied by the third pump circuit instead of the second pump circuit.