Patent ID: 9007138
Filing Date: 2015-04-14
Classification: H03B,H03K,H03L

Abstract:
1. An oscillator circuit comprising: a clock output to provide an output clock signal; a first circuit comprising: a first source current leg coupled to source current, when enabled, to the source current node; a first sink current leg coupled to sink current, when enabled, from the sink current node; a second source current leg coupled to source current, when enabled, to the source current node; a second sink current leg coupled to sink current, when enabled, from the sink current node; wherein the frequency of the output node is dependent on amount of source current sourced to the source current node and an amount of sink current sinked from the sink current node; a control circuit to control an enablement of the first source current leg, the first sink current leg, the second source current leg, and the second sink current leg, wherein the first source current leg and the first sink current leg are enabled during a startup mode of the oscillator circuit and the second source current leg and the second sink current leg are enabled subsequent to the startup mode of the oscillator circuit, wherein current sourced to the source current node by the first source current leg varies more with temperature and voltage than current sourced to the source current node by the second source current leg, and current sinked from the sink current node by the first sink current leg varies more with temperature and voltage than current sinked from the sink current node by the second sink current leg.