Patent ID: 7843287
Filing Date: 2010-11-30
Classification: H03H

Abstract:
1. A semiconductor integrated circuit comprising: over a semiconductor chip, a resonant circuit including a first capacitor having a variable capacitance controlled by a first control signal applied to a first control terminal, and a gyrator for equivalently emulating an inductor by including a second capacitor having a variable capacitance controlled by a second control signal applied to a second control terminal, wherein the first capacitor has a first terminal, a second terminal, and a third terminal, the third terminal of the first capacitor is coupled to the first control terminal, the variable capacitance between the first terminal and the second terminal of the first capacitor is controlled by the first control signal applied to the third terminal of the first capacitor, wherein the second capacitor has a first terminal, a second terminal, and a third terminal, the third terminal of the second capacitor is coupled to the second control terminal, the variable capacitance between the first terminal and the second terminal of the second capacitor is controlled by the second control signal applied to the third terminal of the second capacitor.