A 1 GHz Bandwidth Low-Pass $\Delta \Sigma$ ADC With 20–50 GHz Adjustable Sampling Rate

A low-pass continuous-time delta-sigma data converter with adjustable sampling rate from 20-50 GS/s has been demonstrated in a production 165 GHz-fT 130-nm SiGe BiCMOS process. The ADC exploits the high transistor fT of modern silicon technologies to achieve an ENOB of 7 bits over a 500 MHz passband and 6 bits over a 1 GHz passband while consuming 350 mW from a 2.5 V supply (650 mW including on ch...