Abstract
A 77-GHz IQ modulator in a fully differential circuit configuration is presented. It includes an local oscillation (LO) buffer amplifier, a medium-power output stage, a double-balanced active mixer architecture and on-chip baluns for easy characterization. A differential branch-line coupler provides quadrature phase signals at the upconversion mixer LO inputs. The circuit is manufactured in a 200-GHz transit frequency technology, and the circuit performance is shown by on-wafer measurements.
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