A Precision Wideband Quadrature Generation Technique With Feedback Control for Millimeter-Wave Communication Systems
作者： Tong Zhang , Ali Najafi , Mazhareddin Taghivand , Jacques Christophe Rudell
DOI: 10.1109/TMTT.2017.2735404
关键词:
摘要: An integrated two-stage polyphase filter (PPF) with feedback control for quadrature local oscillator generation at millimeter-wave frequencies is described. To minimize the in-phase (I) and (Q) mismatch, second stage of PPF utilizes triode-region nMOS transistors to implement variable resistors where resistance precisely controlled by modulating shared gate-to-source bias voltage gate devices. The devices set a loop which changes variations in process, voltage, temperature. A prototype signal generator, employing this design, 28-nm LP CMOS process. worst case measured phase/amplitude imbalance 2°/0.32 dB (typical-typical corner dies) 2.2°/0.55 (slow-slow reported over 7-GHz bandwidth fixed current (ICtrl). By retuning ICtrl every 7 GHz, IQ generator would maintain accuracy from 55 70 GHz. core area occupied circuitry 20 μm × 40 device consumes less than 192 μW, 120/72 μW comes control-loop/opamp, respectively. proposed method has simulated input impedance 150 Ω in-parallel 18 fF.
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