Analysis and design of a concurrent dual-band self-oscillating mixer

Abstract

A concurrent dual–band self–oscillating mixer, based on a ring resonator, is proposed and analyzed in detail. Taking advantage of the ring even and odd resonances, it is able to operate in concurrent dual quasi–periodic mode and in an injection–locked regime. In the second case, it behaves as a dual frequency zero–IF mixer. The stability properties are analyzed with a reduced–order determinant function that overcomes the problem of limited observability due to a high isolation between different circuit sections. Various procedures, enabling the calculation of the conversion gain, injection–locking bandwidths and phase–noise spectral density, have been applied to a dual mixer at the frequencies 2.3 GHz and 4.1 GHz.