Abstract
This paper presents several novel approaches to improve the dynamic performance of a high-speed, high-resolution digital-to-analog converter (DAC). In order to improve the resolution of a 14-bit DAC, a double segmented decoding plus R-2R architecture will be introduced. DAC system modeling shows that the dynamic performance of the DAC is strongly dependent on the output impedance of DAC current sources. The gain-boosting technique is applied to increase the output impedance of DAC current sources. A novel switch driver is introduced to further improve dynamic performance by isolating digital switching noise from the analog output. Multiple-level emitter coupled logic (MEL) is applied to the decoder logic due to its superior propagation time over emitter-coupled logic (ECL). The DAC circuit was designed using the 60 GHz fT InGaP/GaAs HBT process. From circuit simulation, we find 0.62LSB differential non-linearity (DNL), 0.71LSB integral non-linearity (INL) and 1.25 ns settling time.
| Original language | English (US) |
|---|---|
| Pages (from-to) | V-541-V-544 |
| Journal | Proceedings - IEEE International Symposium on Circuits and Systems |
| Volume | 5 |
| DOIs | |
| State | Published - 2000 |
| Event | Proceedings of the IEEE 2000 International Symposium on Circuits and Systems, ISCAS 2000 - Geneva, Switz, Switzerland Duration: May 28 2000 → May 31 2000 |
ASJC Scopus subject areas
- Electrical and Electronic Engineering