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This paper presents a Ku-band SiGe BiCMOS phased array receive chip capable of forming four-simultaneous beams from two antenna inputs. The design is based on the all-RF architecture with 4-bit active phase shifters and 4-bit variable gain amplifiers in each channel. The four-beam chip results in a gain of 4-6 dB per channel at 13-15 GHz, a noise figure of 10-11 dB, a worst case input P1 dB of -14...
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