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Design of non-balanced cross-coupled oscillators with no matching requirements

Design of non-balanced cross-coupled oscillators with no matching requirements

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Using two-port network transmission parameters we derive the general characteristic equation of a cross-coupled circuit topology which involves two active devices and four or six impedances. The derived equations are generic and apply both to BJT or MOS transistors and even any other active device without any matching constraints. Application to realising novel non-balanced non-matched cross-coupled oscillators is demonstrated. Spice simulations of a MOS oscillator in a 0.25 µ technology are given as well as experimental results from an oscillator employing discrete Bipolar transistors.

Inspec keywords: network topology; bipolar transistors; MOSFET; oscillators

Other keywords: MOS transistors; discrete bipolar transistors; nonbalanced nonmatched cross-coupled oscillators; MOS oscillator; nonbalanced cross-coupled oscillators; general characteristic equation; cross-coupled circuit topology; two-port network transmission parameters; BJT

Subjects: Insulated gate field effect transistors; Bipolar transistors; Oscillators; Network topology

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