A 35–105GHz High Image-Rejection-Ratio IQ Receiver with Integrated LO Doubler and >40dB IRR
This paper presents a 35–105 GHz wideband direct conversion IQ receiver and a 30–105 GHz IF receiver with integrated LO doubler in GF8HP 0.12-µm SiGe BiCMOS technology. Both receiver chips cover Q-, V-, E-, and W-bands and are flipped on a low cost RF board for connectorized measurements. The IQ receiver presents a measured flat conversion gain of 21–33 dB at 35–105 GHz and a double-sideband (DSB) noise figure (NF) of 5–12 dB. With the on-chip I/Q phase-error correction, the IQ receiver maintains better than 40 dBc image-rejection-ratio (IRR) over the entire bandwidth. The IF receiver demonstrates a measured flat conversion gain of 18–33 dB at 30–105 GHz with a similar NF as the IQ receiver. Both receivers have greater than 5 GHz IF (baseband) bandwidth. To our knowledge, this I/Q receiver achieves the state-of-the-art performance in terms of bandwidth, wideband IRR, and NF.