A 1632Gbs NRZPAM4 Receiver with DualLoop CDR and Threshold Voltage Calibration This paper presents a reconfigurable dualmode NRZPAM4 wireline receiver. The receiver implements a twostage continuous time linear equalizer (CTLE) and halfrate decision feedback equalizer (DFE) to extend bandwidth and achieve intersymbol interference (ISI) cancellation, respectively. Compatible dualloop clock and data recovery (CDR) and Gray codebased decoder are used to generate multiphase clock and calibrate DFE threshold voltages. Its high hardware reusability and flexibility greatly reduce power consumption and chip area. The receiver is verified in 22nm CMOS FDSOI technology with 0.8V supply, and the simulation results through moderate lossy channel indicate that the receiver achieves reasonable eye opening, which is 300mVpp in NRZ mode and 80 mVpp(per eye) in PAM4 mode after proper equalization. The jitter performance of 8GHz clock after CDR locked is 1.95ps.

A 32Gbs 3.53mWGbs Adaptive Receiver AFE Employing a Hybrid CTLE, EdgeDFE and Merged DataDFECDR in 65nm CMOS A 32Gbs adaptive receiver analog frontend (AFE) with a hybrid continuoustime linear equalizer (CTLE), a halfrate distributed edge and data decision feedback equalizer (DFE) and a clock data recovery (CDR) is presented. The hybrid CTLE counters the lowfrequency as well as the highfrequency loss of 21 dB at Nyquist. Further postcursors can be solved by using a half rate, distributed 3tap edgeDFE and 2tap dataDFE, which is partially embedded in the CDR. The distributed DFE scheme addresses the inter symbol interference (ISI) at the edge and reduces the data jitter while dataDFE guarantees the vertical opening of the data eye. Fabricated in 65nm CMOS, occupying an active area of 0.3 mm2, the proposed prototype demonstrates an improvement of 0.15 UI in the horizontal eye opening of the data output at a receiver AFE with the conventional 5tap dataDFE at BER10xe2x88x9212, under a pseudorandom binary sequence (PRBS) of 2311. The competitive power efficiency of 3.53 mWGbs is measured with a supply voltage of 1.2 V.