Abstract:
A radio frequency (RF) front end circuit for connecting an antenna to a transceiver having multiple operating modes is disclosed. The circuit has a first transmit input receptive to signals of a first operating mode and a second operating mode from the transceiver. There is also a second transmit input receptive to signals of a third operating mode from the transceiver. The circuit has a first power amplifier for the first and second operating modes, a second power amplifier for the first operating mode, and a third power amplifier for the second and third operating mode. A first switch network selectively interconnects the first transmit input to a one of the second and third power amplifiers.
Abstract:
A balanced amplifier includes a bypass branch (19), termination elements (TE1, TE2) and an amplifying section (10). The section (10) includes amplifiers (A1, A2), first coupling/splitting unit (14) having a first input signal receiving port (14a), a second port (14b) connected to a termination element (TE1), a third port (14c) connected to a first amplifier (A1), and a fourth port (14d) connected to a second amplifier (A2). The section (10) also includes second coupling/splitting unit (16) having a first port (16a) connected to first amplifier (A1), a second port (16b) connected to second amplifier (A2) and a third port (16c) connected to a termination element (TE2). The second coupling/splitting unit (16) combines signals from amplifiers (A1, A2) as output signals on a fourth port (16d) for supply to a signal output (O). The branch (18) is connected to the second port (14b) of the first coupling/splitting unit (14) and provides bypass signals to output (O).
Abstract:
The present invention proposes a power amplifier circuit for amplifying an input RF signal with respect to a specified RF output power comprising an input terminal (2) for supplying the input RF signal to be amplified, an output terminal for the RF signal with the output power specified, an amplification path (3) formed between the input terminal (2) and the output terminal (7) having a power amplification circuit (4) for amplifying the RF signal, a bypass (5) formed betweeD the input terminal (2) and the output terminal (7) for the RF signal to bypass the amplification path (3), a control terminal (6) for controlling the operation of the amplification path (3) and the bypass (5) such, that an RF signal is either passed through the amplification path (3) or the bypass (5). The power amplifier circuit (1 ") further comprises a variable gain amplifier circuit (15) for a pre-amplification of the input RF signal which is placed between the line from the input terminal (2) to the amplification path (3) and the bypass (5), and a delay control means (16, 17, 18, 19) for controlling the variable gain amplifier (15), the amplification path (3), and the bypass (5), whereby, before setting the operating conditions of the variable gain amplifier (15), the amplification path (3), and the bypass (5) in a state to achieve the RF output power specified, the delay control means (16, 17, 18, 19) is adapted to first set the respective operating conditions in the inverse state thereof. The invention further relates to a method for executing the steps on this system.
Abstract:
A method for use in an electronic device having an amplification unit, the method comprising: detecting a current temperature of the electronic device when the amplification unit is in a first state in which the amplification unit is operated in accordance with first control value; detecting whether the current temperature meets a threshold; identifying a second control value that is lower than the first control value, when the current temperature meets the threshold; and changing an amount of power supplied to the amplification unit by transitioning the amplification unit into a second state in which the amplification unit is operated in accordance with the second control value.
Abstract:
Radio-frequency (RF) power supply apparatus (40) for supplying RF power to discharge electrodes (22, 24, 26) of a gas-discharge laser includes a plurality of amplifier modules (Al - A6) each having an RF output. A power combining arrangement (20) is provided for combin- ing the amplifier module RF- outputs into a single combined RF-output connected to the discharge electrodes (24, 26). A DC power supply (30) is connectable to or disconnectable from each of the transistor amplifier modules (Al - A6), separately, to allow current drawn by any of the amplifier modules (Al - A6) to be monitored by a single current sensor (CS1 -CS6).
Abstract:
A protection circuit for extending the dynamic range of an amplifier circuit is described. Off-chip impedances, such as inductors, cause the output of the circuit to swing above and below the bias voltage. A protection circuit is included, either on chip or off-chip, to protect the integrated circuit components if there is a fault condition in either of the off-chip impedances.