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An injection-locking scheme for precision quadrature generation

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4 Author(s)
Kinget, P. ; CeLight Inc., Iselin, NJ, USA ; Melville, R. ; Long, D. ; Gopinathan, V.

We describe a novel quadrature splitter based on injection locking a cascade of ring oscillators to a low-phase-noise (external) single-phase reference clock. The output signals are in accurate quadrature with low phase noise over a wide bandwidth. This scheme inherently operates at high signal frequencies and is insensitive to the shape of the reference clock waveform. Experimental results at 2.7 GHz are reported for a prototype implementation in 0.25-μm BiCMOS technology. To prove the viability of this scheme, a single-sideband upconverter was implemented along with the splitter. Over several chips, an average sideband suppression better than 45 dB over a large signal bandwidth of 100 MHz was achieved

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:37 ,  Issue: 7 )