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US 2014/0176244 A1Published application
Voltage-controlled oscillator with high loop gain
AssigneeQuadlink Technology, Ltd.
InventorChing-Lung Ti
Life of this patent
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Abstract
A voltage-controlled oscillator with high loop gain includes a first transistor, a second transistor, an inductor, a third transistor, a fourth transistor and a gain circuit. The gain circuit provides a high loop gain in the voltage-controlled oscillator, which operates at wider tuning range but with low power consumption due to capacitance value provided by transistors thereof.
Claims5
A voltage-controlled oscillator with high loop gain, comprising:
- a first transistor, having a source node, a gate node, and a drain node;
- a second transistor, having a source node, a gate node, and a drain node, the source node of the second transistor being coupled to the source node of the first transistor, the gate node of the second transistor being coupled to the drain node of the first transistor, and the drain node of the second transistor being coupled to the gate node of the first transistor;
- an inductor, having two ends connected with the drain nodes and the gate nodes of the first transistor and the second transistor cross-coupled pair respectively;
- a third transistor, having a source node, a gate node, and a drain node, the gate node and the drain node of the third transistor being coupled to the ends of the inductor separately;
- a fourth transistor, having a source node, a gate node, and a drain node, the source node of the fourth transistor being coupled to the source node of the third transistor, the gate node of the fourth transistor being coupled to the drain node of the third transistor, and the drain node of the fourth transistor being coupled to the drain node of the third transistor;
- and
- at least one gain circuit, providing a loop gain in the voltage-controlled oscillator, comprising;
- a fifth transistor, having a source node, a gate node, and a drain node, the drain node of the fifth transistor being coupled to the inductor;
- a sixth transistor, having a source node, a gate node and a drain node, the source node of the sixth transistor being coupled to the source node of the fifth transistor, the gate node of the sixth transistor being coupled to the drain node of the fifth transistor, and the drain node of the sixth transistor being coupled to the gate node of the fifth transistor and the inductor;
- a seventh transistor, having a source node, a gate node and a drain node, the drain node of the seventh transistor being coupled to the inductor;
- and
- an eighth transistor, having a source node, a gate node and a drain node, the source node of the eighth transistor being coupled to the source node of the seventh transistor, the gate node of the eighth transistor being coupled to the drain node of the seventh transistor, and the drain node of the eighth transistor being coupled to the gate node of the seventh transistor and the inductor.
9 more elements
Dependencies are inferred from the claim text.