System and method for dual-core vco
A core and transistor technology, applied in the field of dual-core VCO systems, can solve problems such as poor phase noise performance
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example 1
[0054] Example 1: A method of operating a voltage controlled oscillator (VCO), comprising: generating a first oscillation signal in a first VCO core and generating a second oscillation signal in a second VCO core such that the first oscillation signal and the second The oscillating signals have the same frequency and a fixed phase offset. The VCO includes a first VCO core and a second VCO core, and each VCO core includes a pair of transistors. The VCO also includes a transformer having a first winding coupled between control nodes of the transistor pair of the first VCO core and a second winding coupled between control nodes of the transistor pair of the second VCO core.
example 2
[0055] Example 2: The method of example 1, wherein the first VCO core and the second VCO core each include a Colpitts oscillator.
example 3
[0056] Example 3: The method of one of examples 1 and 2, further comprising buffering a fundamental frequency of the first oscillating signal from the output node of the transistor pair of the first VCO core or the second VCO core.
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