Single ended multiband feedback linearized RF amplifier and mixer with DC-offset and IM2 suppression feedback loop

A receiver arrangement, comprising:

• a single ended multiband feedback amplifier;
• at least one single ended input, differential output mixer arrangement comprising a main mixer and a trim mixer;
• and
• a mixer feedback loop circuit configured to receive differential output signals generated by the mixer arrangement, generate a feedback signal based on the received differential output signals, and provide the feedback signal to the mixer arrangement to thereby minimize DC-offset and second order intermodulation products,
• wherein the single ended multiband feedback amplifier comprises:
• an input stage, an output stage and a feedback net coupled between the input and output stages;
• and
• a programmable resonance tank circuit connected to an output of the input stage, wherein the resonant frequency of the programmable resonance tank circuit is set based on a frequency band received at an input of the input stage, and
• wherein the output stage comprises two pair of transistors, one pair transistor is coupled to an output node of the single ended multiband feedback amplifier through an AC coupled path and the other pair transistor through a DC coupled path, and wherein either the AC path or the DC path is selected based on an output power level of a power amplifier.

A receiver arrangement, comprising:

• a single ended multiband feedback amplifier;
• at least one single ended input, differential output mixer arrangement comprising a main mixer and a trim mixer;
• and
• a mixer feedback loop circuit configured to receive differential output signals generated by the mixer arrangement, generate a feedback signal based on the received differential output signals, and provide the feedback signal to the mixer arrangement to thereby minimize DC-offset and second order intermodulation products,
• wherein the main mixer comprises:
• a first transistor pair, each transistor of said first pair comprising a first input node that is DC-coupled to respective differential inputs of a balanced signal pair generated by a signal generator, a second node connected with the second node of the other of the first pair of transistors to a common node and receiving a signal output from the single ended multiband feedback amplifier, and an output node that outputs the differential output signal;
• and
• wherein the trim mixer comprises:
• a second transistor pair, each transistor of said second pair comprising an input node that is AC-coupled to the respective differential inputs of the balanced signal pair, a second node connected with the second node of the other of the second pair of transistors to a common node, and an output node connected to the output node of the first transistor pair;
• wherein the common nodes of the first and second transistor pairs are AC-coupled with each other, and wherein the trim mixer receive the feedback signal from the mixer feedback loop circuit.

A receiver arrangement, comprising:

• a single ended multiband feedback amplifier;
• at least one single ended input, differential output mixer arrangement comprising a main mixer and a trim mixer;
• and
• a mixer feedback loop circuit configured to receive differential output signals generated by the mixer arrangement, generate a feedback signal based on the received differential output signals, and provide the feedback signal to the mixer arrangement to thereby minimize DC-offset and second order intermodulation products,
• wherein the mixer feedback loop circuit comprises:
• a first stage including a third transistor pair, each transistor of the third transistor pair including a first input node that receives a respective one of the differential output signals from the mixer arrangement, and an output node, wherein said first stage has a low pass filter characteristic;
• and
• a second transconductance stage including a fourth transistor pair, each transistor of the fourth transistor pair including an first input node connected to one of the output nodes of the third transistor pair, and an output node that outputs the feedback signal to the second transistor pair of the trim mixer to control bias voltages of the second transistor pair.