Output power performance of dual‐fed and single‐fed distributed amplifiers

Integrated Combined Amplifiers for Planar Circuits

“…More recent activity concentrated on efficient power combining and utilization of the transistors [10] [13]. A basic schematic of an optimum 4-FET dual-fed distributed amplifier is shown in Fig.…”

Integrated Combined Amplifiers for Planar Circuits

“…More recent activity concentrated on efficient power combining and utilization of the transistors [10] [13]. A basic schematic of an optimum 4-FET dual-fed distributed amplifier is shown in Fig.…”

Linear Polarized Matched-Input Active Integrated Transmit Antenna

“…Using this approach, the active antenna input port is matched and the FETs are driven equally but with 180 degree phase difference. The standing-wave on loop transmission structures can be decomposed into anti-clockwise and clockwise waves and means that the voltages at nodes A and B are sums of forward and a backward traveling waves, and this is beneficial in the presence of line losses [10]. If 180 degree transmission lines are inserted in the middle of the 50 Q lines as shown in Fig.…”

Compact dual-fed distributed power amplifier

“…The gain of the DFDA is maximized when 180 hybrids are used [9]. For the case of an even number of field-effect transistors (FETs) and use of 180 hybrids, 180 electrical spacing between the FETs results in all FETs contributing equal output power [10] and operating into identical load trajectories [11]. These identical load trajectories can be made optimum, thereby ensuring efficient operation and full utilization of all FETs [11].…”

“…These identical load trajectories can be made optimum, thereby ensuring efficient operation and full utilization of all FETs [11]. Under this condition, the combining efficiency is 100% [10].…”

“…In other words, the FET load trajectories are identical when is equal to 180 [11], [13]. It has been shown [10] that the dual-feeding mechanism partially compensates for line loss, resulting in similar load trajectories in the presence of line loss.…”

Integrated Combined Amplifiers for Planar Circuits

“…More recent activity concentrated on efficient power combining and utilization of the transistors [10] [13]. A basic schematic of an optimum 4-FET dual-fed distributed amplifier is shown in Fig.…”

Linear Polarized Matched-Input Active Integrated Transmit Antenna

“…Using this approach, the active antenna input port is matched and the FETs are driven equally but with 180 degree phase difference. The standing-wave on loop transmission structures can be decomposed into anti-clockwise and clockwise waves and means that the voltages at nodes A and B are sums of forward and a backward traveling waves, and this is beneficial in the presence of line losses [10]. If 180 degree transmission lines are inserted in the middle of the 50 Q lines as shown in Fig.…”

Compact dual-fed distributed power amplifier

“…The gain of the DFDA is maximized when 180 hybrids are used [9]. For the case of an even number of field-effect transistors (FETs) and use of 180 hybrids, 180 electrical spacing between the FETs results in all FETs contributing equal output power [10] and operating into identical load trajectories [11]. These identical load trajectories can be made optimum, thereby ensuring efficient operation and full utilization of all FETs [11].…”

“…These identical load trajectories can be made optimum, thereby ensuring efficient operation and full utilization of all FETs [11]. Under this condition, the combining efficiency is 100% [10].…”

“…In other words, the FET load trajectories are identical when is equal to 180 [11], [13]. It has been shown [10] that the dual-feeding mechanism partially compensates for line loss, resulting in similar load trajectories in the presence of line loss.…”

Integrated Combined Amplifiers for Planar Circuits

“…More recent activity concentrated on efficient power combining and utilization of the transistors [10] [13]. A basic schematic of an optimum 4-FET dual-fed distributed amplifier is shown in Fig.…”

Linear Polarized Matched-Input Active Integrated Transmit Antenna

“…Using this approach, the active antenna input port is matched and the FETs are driven equally but with 180 degree phase difference. The standing-wave on loop transmission structures can be decomposed into anti-clockwise and clockwise waves and means that the voltages at nodes A and B are sums of forward and a backward traveling waves, and this is beneficial in the presence of line losses [10]. If 180 degree transmission lines are inserted in the middle of the 50 Q lines as shown in Fig.…”

Compact dual-fed distributed power amplifier

“…The gain of the DFDA is maximized when 180 hybrids are used [9]. For the case of an even number of field-effect transistors (FETs) and use of 180 hybrids, 180 electrical spacing between the FETs results in all FETs contributing equal output power [10] and operating into identical load trajectories [11]. These identical load trajectories can be made optimum, thereby ensuring efficient operation and full utilization of all FETs [11].…”

“…These identical load trajectories can be made optimum, thereby ensuring efficient operation and full utilization of all FETs [11]. Under this condition, the combining efficiency is 100% [10].…”

“…In other words, the FET load trajectories are identical when is equal to 180 [11], [13]. It has been shown [10] that the dual-feeding mechanism partially compensates for line loss, resulting in similar load trajectories in the presence of line loss.…”