VCO Linearization Using Harmonic Balance

In this work, different techniques are proposed for the computer aided design of voltage-controlled oscillators (VCO). The first technique allows setting the operation frequency band for specific values of the tuning voltage. The second technique imposes a linear frequency-voltage characteristic wit...

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Bibliographic Details
Main Authors: Dominguez, J., Sancho, S., Suarez, A.
Format: Conference Proceeding
Language:English
Subjects:
Capacitance
Character generation
Chirp
Chirp Signal
Circuit optimization
Circuit synthesis
Frequency
Harmonic Balance
Optimization
Signal generators
Tuning
Voltage
Voltage-controlled oscillator
Voltage-controlled oscillators
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Summary:In this work, different techniques are proposed for the computer aided design of voltage-controlled oscillators (VCO). The first technique allows setting the operation frequency band for specific values of the tuning voltage. The second technique imposes a linear frequency-voltage characteristic with the aid of an auxiliary generator. To follow this characteristic, the circuit is solved in terms of an ideal capacitance, synthesized, at a later stage, with the tuning varactor embedded in a linear network. In the third technique, the oscillator response to a sawtooth input, used to generate a chirp signal, is improved, eliminating spurious frequencies, not observable in steady state. To illustrate the techniques, a VCO operating in the C-band has been optimized and used to generate a chirp signal with low nonlinear frequency distortion. The VCO has been manufactured and measured, obtaining very good agreement with the simulation results
ISSN:0149-645X
DOI:10.1109/MWSYM.2006.249828