Patent ID: 8884708

Claim:
A digitally controlled oscillator device comprising: first and second oscillation output nodes from which complementary oscillation output signals are output; coil elements coupled between the first oscillation output node and the second oscillation output node; a plurality of capacitor units coupled in parallel between the first oscillation output node and the second oscillation output node; a negative resistance generating circuit which generates a negative resistance between the first oscillation output node and the second oscillation output node; and a control circuit which controls the capacitor units, wherein each of the capacitor units includes capacitive elements, and a control node which selects whether the capacitive elements are coupled to the first and second oscillation output nodes as set parameters for an oscillation frequency, wherein the control circuit drives the respective control nodes in the capacitor units through a plurality of control lines, and wherein a first shield layer is disposed between the control lines and the first and second oscillation output nodes in such a manner as to effectively shield between the control lines and the first and second oscillation output nodes.