A Third - Order Current - Mode Continuous - Time
نویسندگان
چکیده
MODULATOR H. Aboushady, M. Dessouky, E. de Lira Mendes and P. Loumeau Universit e Paris VI, Laboratoire LIP6 4 Place Jussieu, 75252 Paris Cedex 05, France Ecole Nationale Sup erieure des T el ecommunications 46 Rue Barrault, 75634 Paris Cedex 13, France Email: [email protected] Abstract| In this paper, the design procedure for a thirdorder continuous-time modulator with RZ feedback is described. The circuit is realized using continuous-time current-mode integrators and DACs with switched-current sources. A design method to nd the minimum biasing current required to achieve the desired dynamic range is presented. With a sampling frequency of 25:6MHz, the circuit is expected to achieve 84dB of dynamic range for a 100kHz bandwidth input signal. The circuit operates from a power supply of 1:7V and consumes 7:4mW in a 0:35 m CMOS process.
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