Triple cascode power amplifier

A multiple stage cascode power amplifier, comprising:

• at least one first-stage transistor pair, each comprising two first-stage transistors that respectively receive two dynamic bias voltages with opposite polarities;
• at least one second-stage transistor pair coupled with corresponding first-stage transistor pair to form at least one first node, each second-stage transistor pair comprising two second-stage transistors coupled with each other to form a second node;
• and
• a third-stage transistor pair coupled with one of the at least one second-stage transistor pair, the third-stage transistor pair comprising two third-stage transistors for outputting a differential signal;
• wherein the at least one first-stage transistor pair and the at least one second-stage transistor pair are low voltage components while the third-stage transistor pair is a high voltage component;
• wherein each of the second-stage transistors receives a control signal at a corresponding second node to control a voltage across a corresponding first-stage transistor within a predetermined range;
• and
• wherein the power amplifier transforms the differential signal into a single-ended signal for output.

A triple cascode power amplifier, comprising:

• a first-stage transistor pair comprising two first-stage transistors, gates of which respectively receive a first gate voltage;
• a second-stage transistor pair coupled with the first-stage transistor pair, the second-stage transistor pair comprising two second-stage transistors;
• and
• a third-stage transistor pair coupled with the second-stage transistor pair, the third-stage transistor pair comprising two third-stage transistors for outputting a differential signal;
• wherein the first-stage transistor pair and the second-stage transistor pair are low voltage components while the third-stage transistor pair is a high voltage component;
• and
• wherein gates of the two second-stage transistors receive a control signal to control voltages across the two first-stage transistors within a predetermined range, and wherein the first gate voltages are provided according to the control signal.