An 8-GHz continuous-time /spl Sigma/-/spl Delta/ analog-digital converter in an InP-based DHBT technology

An 8-GHz clock-rate second-order continuous-time /spl Sigma/-/spl Delta/ analog-digital converter achieves 57.4 dB, 51.7 dB and 40.2 dB SNR at signal sampling rates of 125 Ms/s, 250 Ms/s and 500 Ms/s, respectively. The ADC also achieves > 75 dBc of intermodulation suppression. The IC occupies a die area of 1.45mm/sup 2/, contains 76 transistors, and is fabricated in an InP-based HBT technology.