Large dynamic range high frequency fully differential CMOS transconductance amplifier

A large dynamic range high frequency fully differential CMOS transconductance amplifier is introduced. It is based on the linear transconductance element proposed in [8] combined with the common-mode feedback circuit in [9]. The original transconductance and common-mode circuits which use two supply voltages are modified for operation under a single power supply. The performance of the complete transconductance amplifier is analysed in details. Simulation results of the whole circuit are also presented, which show that with a single 5 V supply, bandwidth in excess of 300 MHz, THD below 0.7% for a 1 V (pk-pk) differential input signal, and dynamic range in excess of 70 dB can be achieved for the fully differential transconductance amplifier.