Novel active differential phase splitters in RFIC for wireless applications

Abstract

Two novel active differential phase splitters have been designed and fabricated in a GaAs MESFET process. The new circuits employ a concept of feedback to adjust gain and phase unbalance separately and accurately. The active phase splitters feature simplicity, low power supply and wide-band performance. The circuits can provide f 1 dB and 180 f 1 O differential signals within 4 GHz bandwidth, well covering the frequency range currently used for dual mode commercial wireless communications. In narrowband application more accurate balanced differential signals can be achieved by external tuning.

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“…Also its inherent balun operation, which is sometimes referred to as its common-mode rejection ratio (CMRR), makes it a natural reference for the balun performance that is realiz- A GaAs MESFET implementation is proposed by Ma et al (1998), where an asymmetrical feedback LCR network is used as a means for improving differential pair phase-splitting performance to within ∆A=±1 dB and φ=180 • ±1 • . However, the proposed asymmetrical LCR feedback implementation shown in Fig.…”

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