A novel delta-sigma modulator using resonant-tunneling quantizers

  title={A novel delta-sigma modulator using resonant-tunneling quantizers},
  author={Masaru Chibashi and Keisuke Eguchi and Takao Waho},
  journal={2004 IEEE International Symposium on Circuits and Systems (IEEE Cat. No.04CH37512)},
A /spl Sigma//spl Delta/ modulator based on ultrahigh-speed compound semiconductor technology is proposed. Resonant tunneling diodes (RTDs) are employed for a multi-GHz quasi-differential quantizer. High electron mobility transistors, or HEMTs, with a unity-current-gain cutoff frequency of 150 GHz are also used to obtain integrators. Our transistor-level circuit simulation for a 2nd-order continuous-time /spl Sigma//spl Delta/ modulator exhibits clear noise-shaping characteristics at a sampling… CONTINUE READING


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