Patent ID: 8288895
Filing Date: 2012-10-16
Classification: H03J

Abstract:
1. A tunable capacitor device, comprising: a first capacitor; a second capacitor; a third capacitor, wherein the first, second, and third capacitors are connected in series, wherein the second capacitor is positioned between the first capacitor and the third capacitor; and at least one switch transistor, wherein the at least one switch transistor is connected in parallel with the second capacitor, and wherein during an ON state of the at least one transistor, the tunable capacitor device provides a first total capacitance defined by a series combination of only the first capacitor and the third capacitor, and further wherein during an OFF state of the at least one transistor, the tunable capacitor device provides a second total capacitance defined by a series combination of the first capacitor, the third capacitor, and an equivalent capacitance, wherein the equivalent capacitance is a parallel combination of the second capacitor and a parasitic capacitance of the at least one switch transistor.