Six inverting amplifier transconductance stage and methods for its use

A method for filtering a signal, comprising the steps of:

• a) inputting the signal to first and second inverting amplifiers of a transconductance stage, wherein the signal is AC coupled to said first and second inverting amplifiers;
• b) biasing said first and second inverting amplifiers with a first current source;
• c) coupling a first input of a common mode feedback loop to the output of said first inverting amplifier and coupling a second input of said common mode feedback loop to the output of said second inverting amplifier;
• and
• d) delivering an output signal from said common mode feedback loop.

A transceiver system, comprising:

• an analog transceiver chain with filtering blocks;
• said filtering blocks include at least one of a transconductance stage including:
• first and second parallel inverting amplifiers, wherein the inputs of said first and second parallel inverting amplifiers are AC coupled to provide an input to the transconductance stage;
• a first current source coupled to the inputs of said first and second parallel inverting amplifiers;
• output terminals of the transconductance stage coupled to outputs of said first and second parallel inverting amplifiers;
• third and fourth series inverting amplifiers coupled across said output of the transconductance stage;
• and
• fifth and sixth series inverting amplifiers coupled across said output of the transconductance stage.

A transconductance stage, comprising:

• first and second parallel inverting amplifiers each having an input and an output, wherein the inputs of said first and second parallel inverting amplifiers are AC coupled to provide an input to the transconductance stage;
• a first current source coupled to the inputs of said first and second parallel inverting amplifiers;
• output terminals of the transconductance stage coupled to outputs of said first and second parallel inverting amplifiers;
• and
• a first input of a common mode feedback loop coupled to the output of said first inverting amplifier and a second input of said common mode feedback loop coupled to the output of said second inverting amplifier.