Abstract:
Apparatus and methods for a modified Doherty amplifier operating at gigahertz frequencies are described. The combining of signals from a main amplifier and a peaking amplifier occur prior to impedance matching of the amplifier's output to a load. An integrated distributed inductor may be used in an impedance inverter to combine the signals. A size of the impedance element can be selected by patterning during manufacture to tune the amplifier and to allow power scaling for the amplifier.
Abstract:
An amplifier arrangement (100) comprises a power splitter (110) configured to receive the input signal and produce split input signals (101, 102,...,10N, 113). The amplifier arrangement (100, 200) further comprises a first amplifier branch (120) comprising multiple main amplifier circuits (121, 122,...,12N). Output signals of the multiple main amplifier circuits are combined to generate a first output signal (150). The amplifier arrangement (100, 200) further comprises a second amplifier branch (130) comprising at least one auxiliary amplifier circuit (131). The at least one auxiliary amplifier circuit (131) is configured to receive a split input signal from the power splitter (110) and produce a second output signal (160). The amplifier arrangement (100) further comprises a power combiner (170) configured to receive the first (150) and second (160) output signals and produce the output signal for delivering to the load (180).
Abstract:
Power amplifier having staggered cascode layout for enhanced thermal ruggedness. In some embodiments, a radio-frequency (RF) amplifier such as a power amplifier (PA) can be configured to receive and amplify an RF signal. The PA can include an array of cascoded devices connected electrically parallel between an input node and an output node. Each cascoded device can include a common emitter transistor and a common base transistor arranged in a cascode configuration. The array can be configured such that the common base transistors are positioned in a staggered orientation relative to each other.
Abstract:
According to some implementations, a power amplifier (PA) includes a common emitter configured to receive a radio-frequency (RF) signal. The PA also includes a carrier amplifier coupled to the common emitter to form a carrier cascode configuration, a collector of the carrier amplifier provided with a first supply voltage. The PA further includes a peaking amplifier coupled to the common emitter to form a peaking cascode configuration, a collector of the peaking amplifier provided with a second supply voltage greater than the first supply voltage.
Abstract:
A method for generating a symbol mapping table ( 14) in a memory (13) comprises: selecting an initial set of pulse train segments having a time-granularity corresponding to a second oversampling clock rate (F2), determining a frequency-domain complex energy coefficient of the pulse train segments of the initial set at the carrier frequency, selecting a subset of the pulse train segments of which the frequency-domain complex energy coefficients at the carrier frequency closely approximate the quantized complex output states of the modulation device, so that each quantized complex output state is uniquely mapped to a pulse train segment of the subset, for each pulse train segment mapped to a quantized complex output state, recording at a memory address associated to the quantized complex output state a quantized symbol (16) encoding the pulse train segment.
Abstract:
Ein Verstärker (2) verfügt über zwei Verstärkerschaltungen (16, 17) und einen Leistungsteiler (15). Der Leistungsteiler (15) teilt ein zu verstärkendes Signal auf und erzeugt eine Phasenverschiebung von 90 Grad bei einer Nennfrequenz zwischen resultierenden Teilsignalen. Die Verstärkerschaltungen (16, 17) verstärken dabei jeweils eines der Teilsignale bzw. ein von einem der Teilsignale abgeleitetes Signal. Der Verstärker (2) beinhaltet zusätzlich ein erstes Verzögerungsglied (30), welches zwischen dem Leistungsteiler (15) und einer der Verstärkerschaltungen (17) angeordnet ist.
Abstract:
A method and system for design and implementation of symmetric and asymmetric Doherty power amplifiers are disclosed. Quarter wave transmission lines are interposed between the main and peak power amplifiers of a Doherty power amplifier system and a 3d B hybrid coupler. The impedances of the quarter wavelength transmission lines are chosen based on a ratio of the power ratings of the main and peak power amplifiers such that the impedances seen by the main and peak power amplifiers is independent of the impedance of the 3dB coupler.