We present a 4th-order, 3-bit, 4.3 GHz continuous-time bandpass ΔΣ modulator (CT-DSM) that can directly digitize a 1.3-GHz IF signal. We used the impulse-invariant transform to design the CT-DSM, which has a similar NTF as an idealized discrete-time modulator despite up to 1.6 clock delays in its feedback loop paths. The part was fabricated using InP HBT technology, and has a measured SNDR of 39 dB in a 200 MHz bandwidth.
|Number of pages||4|
|Journal||Proceedings of the Custom Integrated Circuits Conference|
|State||Published - 19 Nov 2003|
|Event||Proceedings of the IEEE 2003 Custom Integrated Circuits Conference - San Jose, CA, United States|
Duration: 21 Sep 2003 → 24 Sep 2003