Abstract:
PROBLEM TO BE SOLVED: To provide a radio-frequency power combiner/divider to be used for combining and dividing a radio-frequency signal (RF signal) having symmetry and a large operating frequency range. SOLUTION: A combiner/divider is provided with a common output/input port OP, N input/output ports I1-IN, and N insulating ports IS1-SIN. Each input/output port I1-IN is connected via 90-degree phase shifters TL1-TLN with the common port OP. Also, the combiner/divider is provided with N transmission path balance/imbalance converters PS1-PSN for mutually connecting one input/output port with one of the N insulating ports IS1-ISN. Each balance/ imbalance converter is operated as a two-way power splitter.
Abstract:
A multiple mode RF power amplifier system is presented having N different power control modes for controlling the level of the output RF power relative to applied input power. The system includes a mode controller that receives one of N different mode select commands and in response thereto selects one of N different control modes to be operational. A gain controller controls the gain of the power amplifier system so as to control the level of the output RF power as a function of a control signal applied thereto. The control signal is applied to the gain controller wherein the control signal has a value dependent upon which of the N modes has been selected.
Abstract:
An RF wideband amplifier system is provided that includes an M way splitter (S) for receiving an RF input signal and splitting same into M RF signals for respective application to M power amplifier modules (PAM-1) to (PAM-M) that amplify the M signals and apply the amplified M signals to an M way combiner that applies an amplified RF signal to a load. A main controller (M.C.) provides an automatic level control reference signal, representative of the desired output power level of each of the power amplifier modules. Each power amplifier module includes an 2*N way balanced splitter(500) that receives one of the M RF signals and splits the signal into 2*N signal portions and the 2*N RF amplifiers (400-414) that respectively receive the 2* N signal portions and amplify same and provide therefrom 2*N amplified signal portions.
Abstract:
A multiple mode RF power amplifier system is presented having N different power control modes for controlling the level of the output RF power relative to applied input power. The system includes a mode controller that receives one of N different mode select commands and in response thereto selects one of N different control modes to be operational. A gain controller controls the gain of the power amplifier system so as to control the level of the output RF power as a function of a control signal applied thereto. The control signal is applied to the gain controller wherein the control signal has a value dependent upon which of the N modes has been selected.
Abstract:
A power amplifier system is presented for use in amplifying an RF input signal comprising N sub-power amplifiers (PA-1 to PA-N) are connected in parallel with each receiving and amplifying a portion of the RF input signal. A combiner (CB) combines the amplified portions of the RF input signal to provide a combined output signal. Each sub-amplifier (PA-1 to PA-N) includes at least one transistor having an input port that receives a DC bias voltage and an output port, such that when the RF input signal is not present a quiescent current flows through the output port. A controller (M.C.) is operative when the RF signal is not present to check and adjust the magnitude of the quiescent current flowing in each of the sub-amplifier output ports in the sequence of 1 N.
Abstract:
A directional coupler comprises a coupler circuit board which is mounted substantially perpendicular to the surface of a parent circuit board. First and second upper traces are disposed on the opposing surfaces of the coupler circuit board. The coupling between the upper electrically conductive traces determines the odd mode impedance of the coupler. First and second lower traces are also disposed on opposing surfaces and connected to ground. The upper and lower traces are arranged such that the even mode of the impedance is determined by the coupling between the first upper trace and the second lower trace and the coupling between the'second upper trace and the first lower trace.
Abstract:
A directional coupler comprises a coupler circuit board which is mounted substantially perpendicular to the surface of a parent circuit board. First and second upper traces are disposed on the opposing surfaces of the coupler circuit board. The coupling between the upper electrically conductive traces determines the odd mode impedance of the coupler. First and second lower traces are also disposed on opposing surfaces and connected to ground. The upper and lower traces are arranged such that the even mode of the impedance is determined by the coupling between the first upper trace and the second lower trace and the coupling between the second upper trace and the first lower trace.
Abstract:
The combiner or divider has a pair of input ports (212,214), a common output port (216) and a pair of isolation ports (218,220) respectively. The two input ports are connected to the common output port through a pair of 1/4 wavelength transmission lines (241,243) respectively. The input ports are connected with the isolation ports through a pair of balun transformers (247,249) respectively.
Abstract:
A power amplifier system is presented for amplifying an RF input signal. The system includes a vector modulator for receiving and modifying an input signal and providing therefrom a modified signal. The system also includes at least one power amplifier the operation of which is monitored and the vector modulator is controlled in accordance with the monitoring.
Abstract:
A directional coupler comprises a coupler circuit board which is mounted substantially perpendicular to the surface of a parent circuit board. First and second upper traces are disposed on the opposing surfaces of the coupler circuit board. The coupling between the upper electrically conductive traces determines the odd mode impedance of the coupler. First and second lower traces are also disposed on opposing surfaces and connected to ground. The upper and lower traces are arranged such that the even mode of the impedance is determined by the coupling between the first upper trace and the second lower trace and the coupling between the second upper trace and the first lower trace.