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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 chip...
This paper motivates the use of continuous-time delta-sigma data converters for bandwidths above 100 MHz. Lowpass and bandpass designs implemented in SiGe BiCMOS and clocked at 20-50 Gb/s are described in the context of radio applications. Next, the viability of key building blocks is investigated in 65-nm GP CMOS including measurement results of a new opamp that achieves 50 dB of gain with 10 GHz...
This paper presents a wideband continuous-time DeltaSigma-modulator intended for multi-gigabit OFDM receiver applications. Two versions of the circuit were fabricated in a 130-nm SiGe BiCMOS process with 170 GHz fT in order to investigate the effect of finite quantizer gain and delay on dynamic range. The ADC achieves an SNDR of 44.3 dB over a 500 MHz passband and an SNDR of 37.1 dB over a 1 GHz passband...
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