Abstract:
The invention relates to a bypass device for a microwave amplifier unit, the microwave amplifier unit (1) comprising at least one low noise amplifier (LNA) and amplifying communication signals in at least one microwave frequency band above 500 MHz, the bypass device extending in parallel to said microwave amplifier unit (1), both extending between an input port (3) and an output port (4), in which amplifier unit (1) switching elements (9,10,16,21) for activating said bypass segment (2) in a bypass mode of the device in case said amplifier unit (1) becomes inoperable and for effectively blocking the bypass segment (2) in an active mode of the device are arranged, said bypass segment comprising a series of bypass segment sections (14,19,17) having at least one junction point connected to an associated one of said switching elements (16,21), where each of said bypass segment sections (14:19:17) comprises at least two coupled transmission lines (31,32;31,33,32;31,34,32:51,52;51,53,52:41,42;41,43,42;41,44,42), where the coupled transmission lines form sets (31,32,51,52,42,41;31,33,32,51,52,42,41;31,34,32,51,53,52,42,44,41) of transmission lines, where only one of the sets is in use at a time, and where each set of coupled transmission lines optimizes the bypass segment (2) to different operating frequencies, whereby the bypass segment is able to operate properly in the bypass mode at more than one frequency.
Abstract:
In one embodiment an amplifier circuit is disclosed. The amplifier circuit comprises an amplifying device configured to amplify a radiofrequency signal, the amplifying device having an output dynamic range; a supply modulator configured to modulate a supply voltage supplied to the amplifying device when an output of the amplifying device is within a first region of the output dynamic range; a tuneable matching network coupled to an output of the amplifying device; and a load controller configured to control the tuneable matching network, when the output of the amplifying device is within a second region of the output dynamic range,and thereby modulate the load to which the output of the amplifying device is applied.
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:
The invention relates to a selection circuit and an amplifier (140, 150) comprising the selection circuit, the selection circuit comprises: at least one power division phase shift module (130) having a first input, a second input, a first output and a second output, and the power division phase shift module comprises at least one 3dB 90° hybrid; a first transmission line module (160) connecting the first input to a first input port of the selection circuit; a second transmission line module (170) connecting the second input to a second input port of the selection circuit; a third transmission line module (180) connecting the first output to the second input; a first switch module (190) used for grounding the second input port; and a second switch module (191) used for grounding the first output.
Abstract:
The disclosed embodiments relate to a retro-directive array that facilitates a tracking operation. This retro-directive array includes a first antenna configured to receive an input signal which is substantially circularly polarized from a tracking device. The first antenna separates the input signal into two signal components (e.g., E X and E Y ) associated with different orthogonal polarizations, wherein the two signal components comprise a quadrature signal wherein E Y = j•E X . The retro-directive array also includes a bi-directional quadrature gain (BQG) module coupled to the first antenna which is configured to boost the quadrature signal. It additionally includes a second antenna which configured to transmit the boosted quadrature signal to the tracking device. The disclosed embodiments also relate to a transceiver switch, which includes: an input configured to receive a signal to be transmitted, and two phase mixers configured to receive the signal to be transmitted and phase inputs I and Q, and to produce a signal comprising two quadrature signal components Si and SQ, respectively, wherein S Q = j S I . The transmit switch also includes a hybrid coupler, which is configured to combine S I phase shifted by 180° with S Q phase shifted by 90° to produce a transmit output which is proportionate to S; and a switching mechanism configured to turn off the transmit output by swapping the phase inputs I and Q to the phase mixers.
Abstract:
According to the present invention, there is provided an apparatus (300) comprising a hybrid network (301, 302) comprising at least one hybrid coupler, and a plurality of circulators (303, 304, 305, 306), each circulator having a first port connected to the hybrid network (301, 302), and further having a second port and a third port. Each circulator is arranged to direct a signal received via the second port to the hybrid network (301, 302) via the first port, and to direct a signal received from the hybrid network (301, 302) towards the third port.
Abstract:
A RF-digital hybrid mode power amplifier system for achieving high efficiency and high linearity in wideband communication systems is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier in the RF domain. The present disclosure enables a power amplifier system to be field reconfigurable and support multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels. As a result, the digital hybrid mode power amplifier system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems, where baseband I-Q signal information is not readily available.