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Abstract

An analog circuit for generating a periodic signal at a selected phase, including one or more phase interpolators that receive orthogonal differential RF signals and a pair of differential gain signals. The differential in-phase RF signal is applied at respective gates of tail transistors, and a first differential gain signal is applied across gates of a transistor pair coupled to each of the tail transistors. The quadrature-phase RF signal and a second differential gain signal is similarly applied to another quad of transistors (i.e., pair of transistor pairs) and associated tail transistors. A load connected to the one transistor in each pair receives the output signal, at a phase corresponding to a ratio of the first and second gain signals. The gain signals may be DC or AC, which allows configuration of the circuit as a phase shifter or an upconversion mixer, and the load may be presented by a transform in which the phase also depends on the relative coupling from the in-phase and quadrature-phase sides of the phase interpolator.

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First Claim