Patent ID: 7979040

Claim:
A method for adjusting the tuning frequency of a tuning circuit comprised of a coil and a plurality of series circuits Ai, each including a capacitor Ci and a switch device Qi where i=1 to n and where n denotes an integer at least equal to two, by varying said tuning frequency by adjusting a control data bi which turns on and off said switch devices Qi, said method including the steps of: determining a desired control data bi for a desired tuning frequency from a first control data bi for a tuning frequency equal to a first frequency and a second control data bi for a tuning frequency equal to a second frequency; and applying said desired control data bi to said first switch devices Qi, wherein, said parallel circuit also includes series circuits Aj each including a capacitor Cj other than said capacitor Ci and a switch device Qj other than said switch device Qi where j=one to m, m<n, m denotes an integer at least equal to two, said switch devices Qi are turned on and off in order to carry out a main adjustment process, and said other switch devices Qj are turned on and off in order to carry out a tracking adjustment process.