Journal article
Nonlinear analysis of a cross-coupled quadrature harmonic oscillator
The dynamic equations governing the cross-coupled quadrature harmonic oscillator are derived assuming quasi-sinusoidal operation. This allows for an investigation of the previously reported tradeoff between close-to-carrier phase noise and quadrature precision. The results explain how nonlinearity in the coupling transconductances, in conjunction with a finite amplitude relaxation time and de-tuning of the individual oscillators, cause close-to-carrier AM-to-PM noise conversion.
A discussion is presented of how the theoretic results translate into design rules for quadrature oscillator ICs. SPECTRE RF simulations verify the developed theory.
| Language: | English |
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| Publisher: | IEEE |
| Year: | 2005 |
| Pages: | 2276-2285 |
| ISSN: | 15580806 and 15498328 |
| Types: | Journal article |
| DOI: | 10.1109/TCSI.2005.853586 |
| ORCIDs: | Johansen, Tom Keinicke |
AM-to-PM noise conversion Circuit noise Coupling circuits Harmonic analysis Noise level Nonlinear equations Oscillators Phase noise Power harmonic filters SPECTRE RF simulations Transconductance Voltage circuit simulation coupling transconductances dynamic equations harmonic oscillators (circuits) integrated circuit design nonlinear analysis nonlinear network analysis oscillators de-tuning phase error phase noise quadrature harmonic oscillator quadrature oscillator quadrature oscillator IC quadrature precision quasisinusoidal operation relaxation time
