Patent ID: 9509289
Filing Date: 2016-11-29
CPC Classification: H03K,H03L

Claim Text:
1. An oscillation circuit comprising: a ring oscillator having a control terminal, an oscillation frequency of the ring oscillator being controllable by a drive current supplied to the control terminal; and a current generating circuit configured to adjust the drive current to a level corresponding to a voltage of the control terminal and supply the drive current to the control terminal, wherein the ring oscillator includes at least three delay elements connected in a ring shape, wherein each delay element includes: wherein the input node of the inverter in each delay element is connected to the output node of the inverter in a different delay element, wherein the current generating circuit includes a current setting resistor and the drive current is controlled to be proportional to a voltage across the current setting resistor, wherein the current generating circuit further includes: wherein each inverter includes a first PMOS transistor and a first NMOS transistor, and wherein the compensation current generating section includes: