A Delay Filter for an ir-UWB Front-End
other
A continuous-time analog delay is designed as a requirement for the autocorrelation function in the quadrature downconversion autocorrelation receiver (QDAR). An eight-order Fade approximation of its transfer function is selected to implement this delay. Subsequently, the orthonormal form is adopted, which is intrinsically semi-optimized for dynamic range, has low sensitivity to component mismatch, high sparsity and whose coefficients can be physically implemented. Each coefficient in the state-space description of the orthonormal ladder filter is implemented at circuit level using a novel 2-stage gm cell employing negative feedback. Simulation results in IBM's Bi-CMOS 0.12 μm technology show that this delay filter requires a total current of 70 mA at a 1.6 V power supply. The 1-dB compression point of the delay is at 565 mV and the SNR is 47.5 dB. On performing a Monte Carlo simulation it becomes evident that the response of the frequency selective analog delay does not suffer drastically from neither process variations nor component mismatch
Topics
TNO Identifier
223288
Publisher
IEEE
Source title
Proceedings of the 2005 IEEE Conference on Ultra-Wideband - ICU 2005, 5-8 September, 2005, Zurich, Switzerland
Place of publication
Piscataway, NJ
Pages
323-327
Files
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