VARIABLE CAPACITY CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a variable capacity circuit that uses a MOS switch for attaining the high breakdown voltage of a switch without using a high breakdown voltage process.

SOLUTION: Since this variable capacity unit circuit is provided with a p MOS switch control circuit 1 for controlling the gate of Q1 to be a VHH and the gate of Q2 to be a VDD or its neighborhood to thereby be able to be turned off so as to prevent high voltage from being applied to a MOSFET, the variable capacity unit circuit does not have to use a high breakdown voltage process so that its manufacturing cost can be reduced.

COPYRIGHT: (C)2006,JPO&NCIPI