A Wide Tuning-Range mm-Wave LC-VCO Sized Using Evolutionary Algorithms
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Date
2019-05
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Publisher
The Ohio State University
Abstract
Designing a LC Voltage Controlled Oscillator (LC-VCO) for mm-Wave frequencies
requires a careful balance of interdependent design parameters. The losses due to
passive elements dictate the required cross coupled pair transconductance (g m ), which
in turn affects the tuning range via fixed capacitance. As such, the design process
requires significant engineering time. An optimization methodology using a genetic
algorithm is proposed to optimize component selection for use in the LC-VCO. The
design for the LC-VCO is broken into pseudo-independent sub-modules to allow the
designer greater control and to allow the optimization to benefit from manual circuit
intuition. Performance of the components chosen by the genetic algorithm is verified
using a circuit simulator to achieve a center frequency of 29 GHz with a 15.8 GHz
tuning range. The simulated phase noise performance is -103.2 dBc/Hz using a 10
MHz frequency offset.
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Keywords
LC-VCO, design automation, genetic algorithm, evolutionary algorithm