■ Seng-Pan U, R. P. Martins, J.E.Franca, "Highly Accurate Mismatch-Free SC Delay Circuits with Reduced Finite Gain and Offset Sensitivity", in Proc. of IEEE International Symposium on Circuits and Systems (ISCAS), Vol. 2, pp 57-60, May-1999.

■ Seng-Pan U, R. P. Martins, J.E.Franca, "A Novel Half-Band SC Architecture for Effective Analog Impulse Sampled Interpolation", in Proc. of IEEE International Conference on Electronics, Circuits and Systems (ICECS), vol.1, pp 389-393, Sep-1998.

■ Seng-Pan U, "A Novel Impulse Sampled Interpolation Technique for Efficient and Accurate Analog Multirate Signal Processing", in Proc. of The 3rd China Association for Science and Technology (CAST) Conference of Young Scientists, , Aug-1998.

■ Seng-Pan U, R. P. Martins, J.E.Franca, "Impulse sampled intermittent polyphase SC FIR rational decimators with double-sampling", in Proc. of IEEE Midwest Symposium on Circuits and Systems, Vol. 2, pp 977-980, Aug-1997.

■ Seng-Pan U, R. P. Martins, J.E.Franca, "Intermittent Polyphase SC Structures for FIR Rational Interpolation", in Proc. of IEEE International Symposium on Circuits and Systems 1997 (ISCAS), Vol. 1, pp 121-124, Jun-1997.

■ Seng-Pan U, R. P. Martins, J.E.Franca, "New Impulse Sampled IIR Switched-Capacitor Interpolators", in Proc. of IEEE International Conference on Electronics, Circuits and Systems (ICECS), Vol. 1, pp 203-206, Oct-1996.

■ Seng-Pan U, R. P. Martins, J.E.Franca, "Switched-Capacitor Finite Impulse Response Interpolators without the Input Sample-and-Hold Filtering Effect", IEEE Midwest Symposium on Circuits and Systems (MWSCAS), Vol. 1 , pp 145-148, Aug-1996.

■ R. P. Martins, Pong Chi Wai, Seng-Pan U, "UMCHIP - First Integrated Circuit designed in Macau (Multifunctional & Mixed A/D - 1.2µm CMOS)", Proc. Int. Conf. on Education, Practice & Promotion of Computational Methods in Engineering using Small Computers - EPMESC-V, pp. 1583-1589, Aug-1995.