A multi-bit digital signal that is generated by modulating a baseband signal by a modulation circuit and includes components in a radio frequency band is amplified by switch-mode amplifiers (100-1, 100-2) on a bit-by-bit basis, amplified signals are band-limited by frequency-variable variable band limiting units (201-1, 201-2) and thereafter subjected to voltage-to-current conversion by voltage/current source conversion units (202-1, 202-2) provided with variable capacitances, the signals converted to current are synthesized at a synthesis point X, and a resultant signal is impedance-corrected by an impedance correction unit (203) and output as a transmission signal to an antenna of a load (300). Consequently, the present invention provides a transmitter capable of synthesizing output signals from a plurality of switch-mode amplifiers and transmitting a resultant signal while maintaining an impedance characteristic with respect to a plurality of transmit frequencies without increasing a circuit size.

In one embodiment, a method includes receiving two or more input radio-frequency (RF) signals, each input RF signal being received on a separate input channel and having a different frequency range. The method also includes amplifying each input RF signal of the two or more input RF signals separately to produce two or more respective amplified RF signals. The method further includes aggregating the two or more amplified RF signals into one aggregated communication signal using a passive waveguide multiplexer, where the aggregated communication signal is an E-band communication signal having a frequency range within approximately 71-76 GHz or approximately 81-86 GHz. The method also includes transmitting the aggregated communication signal.

17 ABSTRACT A transmitter and Doherty power amplifier configured for envelope-controlled biasing of an auxiliary transmitter of the Doherty power amplifier are disclosed. According to one aspect, a transmitter having a main amplifier in a main signal path and an auxiliary amplifier in an auxiliary signal path is provided. The auxiliary amplifier is configured to be activated only when an envelope of an input signal of the transmitter exceeds a power threshold. The transmitter also includes at least one component in the auxiliary signal path configured to be deactivated when the auxiliary amplifier is deactivated, the at least one component including at least one of a pre-power amplifier, a mixer and a local oscillator buffer.

An apparatus is disclosed for phase-shifting signals with a compensation circuit. In example implementations, an apparatus for phase-shifting signals includes a phase shifter having a first port and a second port. The phase shifter also includes a signal phase generator, a compensation circuit, and a vector modulator. The compensation circuit includes a first capacitor with a first capacitance and a second capacitor with a second capacitance. The first capacitance is different from the second capacitance. The signal phase generator is coupled between the first port and the compensation circuit. The vector modulator is coupled between the compensation circuit and the second port.

Systems and methods for magnitude and phase trimming are provided. In one aspect, a radio frequency (RF) trimmer circuit includes an input terminal configured to receive an RF signal, an output terminal configured to output the RF signal, a control input configured to receive a control signal, at least one impedance element, and at least one transistor configured to selectively connect the impedance element onto a path between the input and output terminals. The selectively connecting the impedance element controls at least one of a magnitude trim and a phase trim of the RF signal.

An apparatus that includes transmit driver architecture.

A radio frequency apparatus and a voltage generating device thereof are provided. The voltage generating device includes a first switch and a second switch. A first terminal of the first switch receives a first voltage. A control terminal of the first switch receives a second voltage. A first terminal of the second switch receives the second voltage. A control terminal of the second switch receives the first voltage. A second terminal of the second switch and a second terminal of the first switch are coupled to an output node, wherein the output node outputs an output voltage related to at least one of the first voltage and the second voltage.

A user equipment (UE) includes a transmit chain that includes multiple radio frequency transmitters, multiple power amplifiers and a front end (FE) through which signals are transmitted. To achieve a high power UE solution, aspects of the disclosure selectively combine two or more power amplifier outputs based on an expected power output of the UE. To synchronously combine the outputs, an output feedback signal from a feedback receiver is used to adjust a delay and a phase of one or more signals associated with the power amplifiers.

[Problem] To provide a transmission device that has an enhanced redundant structure in which RF signals having a plurality of frequencies are transmitted to continue transmission even in the event of failure and allows simultaneously both improvement in power efficiency and transmission power and high-speed communication. [Solution] A signal generator 1102 generates RF signals 1201 to 1204. Each of the RF signals 1201 and 1202 is simultaneously input to a broadband/multiband power amplifier 1103, and each of the RF signals 1203 and 1204 are simultaneously input to a broadband/multiband power amplifier 1104. Specifically, the RF signals allocated in two different bands 1211 and 1212 are simultaneously input to each of the power amplifiers. The RF signals 1201 to 1204 are amplified by the broadband/multiband power amplifiers 1103 and 1104 and then transmitted via terminals 1105 and 1106.

A transmitter circuit includes at least one transmitting signal processing device, a compensation device and a compensation value calibration device. The at least one transmitting signal processing device sequentially generates multiple output signals according to multiple input signals. The compensation device sequentially generates the input signals according to multiple initial compensation values. The compensation value calibration device receives the output signals as multiple feedback signals and performs a calibration operation according to the feedback signals. The compensation value calibration device includes a digital signal processor coupled to the compensation device. In the calibration operation, the digital signal processor determines a first characteristic curve according to the initial compensation values and power of the feedback signals at a predetermined frequency, determines a first compensation value corresponding the minimum power according to the first characteristic curve and provides the first compensation value to the compensation device.