Abstract:
A differential power amplifier comprises an envelope tracking power supply configured to provide an envelope power supply signal to the differential power amplifier. The differential power amplifier also comprises an input stage configured to provide a differential signal having a first portion and a second portion to a differential output stage. The differential output stage comprises a first output stage amplifier configured to receive the first portion of the differential signal at a first output stage input and provide a first amplified signal at a first output stage output, as well as a second output stage amplifier configured to receive the second portion of the differential signal at a second output stage input and provide a second amplified signal at a second output stage output. The envelope power supply signal provides power for amplification.
Abstract:
An output matching network for a differential power amplifier comprises an output transformer having a center tap and a low pass filter. The output transformer is configured to receive a first amplified signal from a first differential output stage amplifier of the differential power amplifier and provide a first output signal to the low pass filter. The output transformer is also configured to receive a second amplified signal from a second differential output stage amplifier of the differential power amplifier and provide a second output signal to the low pass filter. The low pass filter is configured to receive the first and second output signal from the output transformer and provide a filtered output signal.
Abstract:
Multimode radio frequency (RF) amplifier systems and techniques are disclosed. In one embodiment, a multimode radio frequency (RF) amplifier system has a first RF amplifier and a second RF amplifier. The first RF amplifier may support a first RF communication standard. The second RF amplifier may support a second RF communication standard. The first RF amplifier includes an auxiliary circuit. The auxiliary circuit may provide a service or a utility to a second RF amplifier. For example, the auxiliary circuit may generate a supply voltage to power the second RF amplifier.
Abstract:
A differential power amplifier has at least an input stage and an output stage. A first output stage amplifier is configured to receive a first portion of a differential signal from the input stage at a first output stage input and provide a first amplified signal at a first output stage output. The second output stage amplifier is configured to receive a second portion of the differential signal from the input stage at a second output stage input and provide a second amplified signal at a second output stage output. Power limiter circuitry is connected to the first and/or output stage inputs and is configured to limit a power level of the differential signal prior to being received at the output stage, such that the differential power amplifier and associated filters are not damaged, while the nominal performance of the differential power amplifier at rated power is not significantly affected.
Abstract:
Differential power amplifier circuitry includes a differential transistor pair, an input transformer, and biasing circuitry. The base contact of each transistor in the differential transistor pair may be coupled to the input transformer through a coupling capacitor. The coupling capacitors may be designed to resonate with the input transformer about a desired frequency range, thereby passing desirable signals to the differential transistor pair while blocking undesirable signals. The biasing circuitry may include a pair of emitter follower transistors, each coupled at the emitter to the base contact of each one of the transistors in the differential transistor pair and adapted to bias the differential transistor pair to maximize efficiency and stability.
Abstract:
A differential power amplifier has at least an input stage and an output stage. A first output stage amplifier is configured to receive a first portion of a differential signal from the input stage at a first output stage input and provide a first amplified signal at a first output stage output. The second output stage amplifier is configured to receive a second portion of the differential signal from the input stage at a second output stage input and provide a second amplified signal at a second output stage output. Power limiter circuitry is connected to the first and/or output stage inputs and is configured to limit a power level of the differential signal prior to being received at the output stage, such that the differential power amplifier and associated filters are not damaged, while the nominal performance of the differential power amplifier at rated power is not significantly affected.
Abstract:
A differential power amplifier comprises an envelope tracking power supply configured to provide an envelope power supply signal to the differential power amplifier. The differential power amplifier also comprises an input stage configured to provide a differential signal having a first portion and a second portion to a differential output stage. The differential output stage comprises a first output stage amplifier configured to receive the first portion of the differential signal at a first output stage input and provide a first amplified signal at a first output stage output, as well as a second output stage amplifier configured to receive the second portion of the differential signal at a second output stage input and provide a second amplified signal at a second output stage output. The envelope power supply signal provides power for amplification.
Abstract:
Differential power amplifier circuitry includes a differential transistor pair, an input transformer, and biasing circuitry. The base contact of each transistor in the differential transistor pair may be coupled to the input transformer through a coupling capacitor. The coupling capacitors may be designed to resonate with the input transformer about a desired frequency range, thereby passing desirable signals to the differential transistor pair while blocking undesirable signals. The biasing circuitry may include a pair of emitter follower transistors, each coupled at the emitter to the base contact of each one of the transistors in the differential transistor pair and adapted to bias the differential transistor pair to maximize efficiency and stability.
Abstract:
Multimode radio frequency (RF) amplifier systems and techniques are disclosed. In one embodiment, a multimode radio frequency (RF) amplifier system has a first RF amplifier and a second RF amplifier. The first RF amplifier may support a first RF communication standard. The second RF amplifier may support a second RF communication standard. The first RF amplifier includes an auxiliary circuit. The auxiliary circuit may provide a service or a utility to a second RF amplifier. For example, the auxiliary circuit may generate a supply voltage to power the second RF amplifier.
Abstract:
An output matching network for a differential power amplifier comprises an output transformer having a center tap and a low pass filter. The output transformer is configured to receive a first amplified signal from a first differential output stage amplifier of the differential power amplifier and provide a first output signal to the low pass filter. The output transformer is also configured to receive a second amplified signal from a second differential output stage amplifier of the differential power amplifier and provide a second output signal to the low pass filter. The low pass filter is configured to receive the first and second output signal from the output transformer and provide a filtered output signal.