A charge sampling baseband filter using a new high linearity Gm for multimode receiver

This paper presents charge sampling circuit using new high linearity transconductor (Gm) cell that has third order distortion cancellation. The proposed Gm-cell has almost constant transconductance value over ±200mV input voltage range. The charge sampling circuit has SNDR around 73 dB with ENOB of 11bits and it consumes 4.38mW power. Its input referred noise is 15.29nV/√Hz and noise figure is 24.67dB at 81MHz. This architecture is used to implement a programmable analog baseband filter for Bluetooth and UMTS. Simulations were carried out using the TSMC 0.18 µm CMOS technology with supply voltage of 1.6V.