摘要:
A RF input signal system and method switches the RF input signal amplified by an amplifier PA1 or PA2 to be present only in great magnitude at the summing port of a hybrid combiner H2 when the SPDT switch SW1 is directing the “RF in” signal to the summing port of the hybrid divider H1, while the balancing port of H1 is terminated by the switch SW1. The benefit of switching between H and V ports by using this method eliminates the insertion losses of the switch SW1 and isolators ISO1 and ISO2 of the prior art. The benefit is also the speed of switching which can now be executed much faster (in nanoseconds) in comparison to the method shown in FIG. 1 where the limiting factor are the PIN diodes used in such devices (SW1 of FIG. 1) that only allows switching transients in tens of microseconds only. The non-summing port of H2 is then only radiating much less energy of −20 to −30 dB below that of the summing port.
摘要:
A multiport amplifier having an output power control function is provided. The multiport amplifier includes a small-sized, low-power auto-calibrating circuit and is used for a communication satellite relay system.
摘要:
A power amplifier (PA) envelope power supply, which provides an envelope power supply signal to radio frequency (RF) PA circuitry, and a process to prevent undershoot of the PA envelope power supply is disclosed. The process includes determining if an envelope control signal to the PA envelope power supply has a step change from a high magnitude to a low magnitude that exceeds a step change limit. Such a step change may cause undershoot of the PA envelope power supply. As such, if the step change exceeds the step change limit, the envelope control signal is modified to use an intermediate magnitude for period of time. Otherwise, if the step change does not exceed the step change limit, the envelope control signal is not modified.
摘要:
An apparatus and method for outputting high-frequency, high-power signals from low-frequency, low-power input is disclosed. The apparatus and method may provide a two-dimensional nonlinear lattice having a plurality of inductors and voltage-dependent capacitors intersecting at a plurality of nodes. Two or more adjacent boundaries of the nonlinear lattice may be provided with input signals which constructively interfere to output a signal of substantially higher amplitude and higher frequency than those of the input signals.
摘要:
High efficiency Doherty amplifiers are described. Contemplated Doherty amplifiers can include an input hybrid coupler having first and second inputs, and first and second drivers that individually drive respective first and second inputs. In this manner, the driver output power to the main and auxiliary amplifiers can be dynamically controlled as a function of an input signal's envelope. This advantageously allows for a substantial decrease in the amount of power wasted by the driver, especially when used with digitally modulated signals.
摘要:
Systems and methods are provided for modulating a radio frequency (RF) carrier signal with a baseband input signal and amplifying the modulated RF carrier signal to provide an amplified RF signal. A quadrature combiner is configured to provide the amplified RF signal at an associated output port. A main amplifier is configured to receive a first modulated RF signal and provide a main output to one of a through port and a coupled port of the quadrature combiner. An auxiliary amplifier is configured to receive a second modulated RF signal and provide an auxiliary output to an isolation port of the quadrature combiner.
摘要:
The invention relates to an amplifier module, comprising at least one amplifier (PA), an antenna port (ANT), a transmission port (TX), a reception port (RX), and a circuit arrangement having at least three 90 DEG hybrids (HYB1, HYB2, HBY3), which each divide a respective input signal into two output signals, wherein the two output signals have a relative phase shift of 90 DEG from each other, wherein the antenna port (ANT), the transmission port (TX), and the reception port (RX) are each connected to at least one 90 DEG hybrid (HYB1, HYB2, HBY3).
摘要:
A Lange coupler having a first plurality of lines on a first level and a second plurality of lines on a second level. At least one line on the first level is cross-coupled to a respective line on the second level via electromagnetic waves traveling through the first and second plurality of lines. The first and second plurality of lines may be made of metal, and the first level may be higher than the second level. A substrate may be provided into which the first and second plurality of lines are etched so as to define an on-chip Lange coupler.
摘要:
The present invention relates to an amplifier circuit where a load modulation is applied to a segmented amplifier. This will reduce the shunt loss since the loss of a segmented amplifier is reduced by allowing each amplifier segment or combination of segments to operate to their full output power capacity, rather than limited to a lower output power which results in a higher shunt loss. Hence, operation to full capacity before adding more segments is made possible by dynamically modulating the load.
摘要:
The present invention relates to a signal directing means (1, 1′, 1″, 36) for dividing or combining signals. It comprises a bottom row first port (2), a first row first and second port (3, 4),and a bottom row signal connector (5).The signal directing means (1, 1′,1″, 36) further comprises a first row first and second amplifier (9; 9′; 10; 10′), each first row amplifier (9, 10; 9′, 10′) having a corresponding first and second terminal (9a, 10a; 9a′, 10a; 9b, 10b; 9b′, 10b), said first terminals (9a, 10a; 9a′, 10a′) being connected along the bottom row signal connector (5). The signal directing means (1, 1′, 1″, 36)also comprises a first row signal connector (11), where said second terminals (9b, 10b; 9b′, 10b) are connected along the first row signal connector (11). The second terminal (9b; 9b′) of the first row first amplifier (9, 9′) is connected to the first row first port (3) and the second terminal (10b; 10b′) of the first row second amplifier (10; 10′) is connected to the first row second port (4).Top row ports (3′, 4′, 25; 19, 20, 27, 29; 19′, 20′, 27′, 29′) each comprise a signal connector (37, 38, 39; 1 40, 41, 42, 43; 40′, 41′, 42′, 43′) and a port terminal (44, 45, 46; 47, 48, 49, 50; 47′, 48′, 49′, 50′).Connecting impedances (50, 51; 52, 53, 54) connect the top row ports (3′, 4′, 25; 19, 20, 27, 29; 19′, 20′, 27′, 29′).