A Novel Complex Gm-C IF Sub-Sampling Mixer
In this paper, a novel circuit referred to as complex G<sub>m</sub>-C sampler that can be used for sub-sampling IF signals is presented. The circuit employs a conventional cross-coupled G<sub>m</sub>-C filter structure with a built-in sampler to combine the functions of complex anti-alias filtering and baseband downconversion by sampling in a single circuit block. The filter response of the individual G<sub>m</sub>-C samplers can be tuned to a conventional lowpass response or a sinc type response depending on the circuit parameters thereby modifying the anti-alias filtering provided by the circuit. Input noise analysis and switch noise analysis of the complex G<sub>m</sub>-C sampler is also performed and the results are presented. The G<sub>m</sub>-C sampler and its complex version are designed using a 0.18 mum CMOS process and its operation are validated using Spectre RF. Simulation results of the designed complex G<sub>m</sub>-C sampler are finally provided.
WOS:000276473700008
2009
29
32
REVIEWED
Event name | Event place | Event date |
Antalya, TURKEY | Aug 23-27, 2009 | |