Millimeter Wave GaAs MMICs For Automotive Applications

Abstract

This paper will present the design methodology and test results of several GaAs monolithic circuits (MMICs) specifically designed for 77 GHz collision avoidance radars. In addition, test data for an integrated transmitter is presented, along with projected 1995 cost tradeoffs between fundamental (77 GHz VCO using 0.15 micron pseudomorphic HEMTs) and multiplied (38.5 GHz VCO used with 0.25 micron power MESFET amplifiers and a multiplier) transmitter approaches.

Ground-Adjustable Inductor for Wide-Tuning VCO Design

“…1 shows various kinds of variable inductors. The types one to three are the major architectures of variable inductors which had published [3][4] and the type 4 is our architecture. Type one is most common variable-inductor.…”

“…In this paper, we present a novel VCO with new variable-inductor switched-modes using a standard 90nm CMOS technology. Because the varactor is the major factor causing low Q and low phase noise [3], there were many paper had published for varactor displacement like switched capacitor array, variable inductor and intrinsic-tuning technique. The new variable-inductor switched-modes could develop in existing structure, so it needs no addition area.…”