Low power comsumption, low noise and high power gain distributed amplifers for communication systems

A distributed amplifier in an RF signal transreceiver, the distributed amplifier comprising:

• an input transmission line, having an input for receiving an input signal to be amplifier;
• an output transmission line, having an output at which an output signal is provided;
• an input impedance match, for providing termination of the input transmission line and for preventing signal reflection in the input transmission line;
• an output impedance match, for providing termination of the output transmission line and for preventing signal reflection in the output transmission line;
• multi-stage Gm (transconductance) cells with common mode feedback, coupled between the input transmission line and the output transmission line, the input transmission line being coupled to the output transmission line by the transconductance of the Gm cells;
• and
• an input gate bias circuit, for providing bias for the multi-stage Gm cells;
• wherein at least one of the Gm cells including:
• a first CMOS inverter, coupled between an input node and an output node of the Gm cell, the first CMOS inverter being for performing V/I conversion;
• and
• second, third, fourth and fifth CMOS inverters, coupled to the first CMOS inverter, the second, third, fourth and fifth CMOS inverters being for providing negative resistance to control common mode of output voltages of the Gm cell and to enhance DC gain of the Gm cell;
• the negative resistance, expressed by expressed by
• gn
• =
• -
• 1
• gm
• 
• 
• 4
• -
• gm
• 
• 
• 5
• ,
• being implemented by choosing:
• gm4>gm5, gm3=gm4, gm2=gm5,
• gm2˜gm5 refer to transconductance values of the second, third, fourth and fifth CMOS inverters.