Abstract:
A Doherty power amplifier (300) is provided that includes a main amplifier device (302) and an auxiliary amplifier device (304). The Doherty power amplifier further includes a phase compensation network (320a and/or 320m). The phase compensation network is configured to maintain a substantially constant phase of one of an output signal from the main amplifier device or an output signal from the auxiliary amplifier device across a range of input powers. The Doherty power amplifier further includes an impedance inverter (106) for power combining an output signal of the main amplifier device with an output signal of the auxiliary amplifier device.
Abstract:
A circuit is provided that includes a Cartesian feedback loop (400). The Cartesian feedback loop (400) includes one or more operational amplifiers (250a-c). At least one of the operational amplifiers (250a) includes two or more cascaded amplifier stages (420a, 420b) and one or more bypass amplifier stages (422). The bypass amplifier stages (422) are connected in parallel with the cascaded amplifier stages (420a, 420b).
Abstract:
A Doherty amplifier that includes a main amplifier device (202) and an auxiliary amplifier device (204). The main amplifier device (202) includes a plurality of independently controllable amplifier segments. The system further includes a coupler (112) for coupling an input signal (110) to each of the main amplifier device (202) and the auxiliary amplifier device (204). The system further includes an impedance inverter (106) for power combining an output signal of the main amplifier device (202) with an output signal of the auxiliary amplifier device (204).
Abstract:
Circuits, methods, and systems are provided for opening a primary feedback loop (207) in a transmitter. An auxiliary feedback loop (208) can be closed when the primary feedback loop (207) is opened, and a controller (209) can match a gain of the primary feedback loop (207) to another gain in the transmitter.
Abstract:
A transconductance cell (100) is disclosed that includes a first transistor (101) and a second transistor (102). A regulator (107) regulates an average voltage in response to a reference voltage (150), where the average voltage corresponds to the average of a voltage at a bias terminal of the first transistor and a voltage at a bias terminal of the second transistor. A mixer including the transconductance cell is also disclosed. In the mixer, the transconductance cell receives a differential input voltage and produces a differential output current. The mixer also includes one or more switches that multiply the differential output current with an oscillator signal. A method is disclosed that includes measuring an average voltage of a voltage at a bias terminal of a first transistor and a voltage at a bias terminal of a second transistor and regulating the average voltage responsive to the measured average voltage and a reference voltage.
Abstract:
A transconductance cell (100) is disclosed that includes a first transistor (101) and a second transistor (102). A regulator (107) regulates an average voltage in response to a reference voltage (150), where the average voltage corresponds to the average of a voltage at a bias terminal of the first transistor and a voltage at a bias terminal of the second transistor. A mixer including the transconductance cell is also disclosed. In the mixer, the transconductance cell receives a differential input voltage and produces a differential output current. The mixer also includes one or more switches that multiply the differential output current with an oscillator signal. A method is disclosed that includes measuring an average voltage of a voltage at a bias terminal of a first transistor and a voltage at a bias terminal of a second transistor and regulating the average voltage responsive to the measured average voltage and a reference voltage.
Abstract:
A Doherty amplifier that includes a main amplifier device (202) and an auxiliary amplifier device (204). The main amplifier device (202) includes a plurality of independently controllable amplifier segments. The system further includes a coupler (112) for coupling an input signal (110) to each of the main amplifier device (202) and the auxiliary amplifier device (204). The system further includes an impedance inverter (106) for power combining an output signal of the main amplifier device (202) with an output signal of the auxiliary amplifier device (204).
Abstract:
Circuits, methods, and systems are provided for opening a primary feedback loop (207) in a transmitter. An auxiliary feedback loop (208) can be closed when the primary feedback loop (207) is opened, and a controller (209) can match a gain of the primary feedback loop (207) to another gain in the transmitter.
Abstract:
A Doherty power amplifier (300) is provided that includes a main amplifier device (302) and an auxiliary amplifier device (304). The Doherty power amplifier further includes a phase compensation network (320a and/or 320m). The phase compensation network is configured to maintain a substantially constant phase of one of an output signal from the main amplifier device or an output signal from the auxiliary amplifier device across a range of input powers. The Doherty power amplifier further includes an impedance inverter (106) for power combining an output signal of the main amplifier device with an output signal of the auxiliary amplifier device.