Patent ID: 9735731
Date: 2017-08-15
CPC Classifications: H03B,H03L,H04B

Claim:
1. 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, wherein the control lines include first and second control lines, wherein the first control line is coupled to the control nodes of 2 wherein the second control line is coupled to the control nodes of 2 wherein the control circuit includes a first buffer circuit which drives the first control line, and a second buffer circuit which drives the second control line, and wherein a drive capacity of the second buffer circuit is 2