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the rf mosfet line: broadband rf power fet 5.0w, to 400mhz, 28v rev. v1 mrf134 1 1 m/a - com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: https://www.macom.com/support 1 product image designed for wideband large C signal amplifier and oscillator applications up to 400 mhz range. n C channel enhancement mode ? guaranteed 28v, 150 mhz performance output power = 5.0 watts minimum gain = 11 db efficiency = 55% (typical) ? small C and large C signal characterization ? typical performance at 400 mhz, 28v, 5.0w output = 10.6 db gain ? 100% tested for load mismatch at all phase angles with 30:1 vswr ? low noise figure: 2.0 db (typ.) at 200 ma, 150 mhz ? excellent thermal stability, ideally suited for class a operation
the rf mosfet line: broadband rf power fet 5.0w, to 400mhz, 28v rev. v1 mrf134 2 2 m/a - com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: https://www.macom.com/support 2
the rf mosfet line: broadband rf power fet 5.0w, to 400mhz, 28v rev. v1 mrf134 3 3 m/a - com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: https://www.macom.com/support 3
the rf mosfet line: broadband rf power fet 5.0w, to 400mhz, 28v rev. v1 mrf134 4 4 m/a - com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: https://www.macom.com/support 4
the rf mosfet line: broadband rf power fet 5.0w, to 400mhz, 28v rev. v1 mrf134 5 5 m/a - com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: https://www.macom.com/support 5
the rf mosfet line: broadband rf power fet 5.0w, to 400mhz, 28v rev. v1 mrf134 6 6 m/a - com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: https://www.macom.com/support 6
the rf mosfet line: broadband rf power fet 5.0w, to 400mhz, 28v rev. v1 mrf134 7 7 m/a - com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: https://www.macom.com/support 7
the rf mosfet line: broadband rf power fet 5.0w, to 400mhz, 28v rev. v1 mrf134 8 8 m/a - com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: https://www.macom.com/support 8
the rf mosfet line: broadband rf power fet 5.0w, to 400mhz, 28v rev. v1 mrf134 9 9 m/a - com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: https://www.macom.com/support 9
the rf mosfet line: broadband rf power fet 5.0w, to 400mhz, 28v rev. v1 mrf134 10 10 m/a - com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: https://www.macom.com/support 10
the rf mosfet line: broadband rf power fet 5.0w, to 400mhz, 28v rev. v1 mrf134 11 11 m/a - com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: https://www.macom.com/support 11 rf power mosfet considerations design considerations the mrf137 is a rf power n C channel enhancement- mode field C effect transistor (fet) designed especially for vhf power amplifier applications. m/a - com rf mos fets feature a vertical structure with a planar design, thus avoiding the processing difficulties associated with v C groove vertical power fets. m/a - com application note an211a, fets in theory andpractice, is suggested reading for those not familiar with the construction and characteristics of fets. the major advantages of rf power fets include high gain, low noise, simple bias systems, relative immunity from thermal runaway, and the ability to withstand se- verely mismatched loads without suffering damage. power output can be varied over a wide range with a low power dc control signal, thus facilitating manual gain control, alc and modulation. dc bias the mrf137 is an enhancement mode fet and, there- fore, does not conduct when drain voltage is applied. drain current flows when a positive voltage is applied to the gate. see figure 10 for a typical plot of drain current versus gate voltage. rf power fets require forward bias for optimum performance. the value of quiescent drain current (i dq ) is not critical formany applications. the mrf137 was characterized at i dq = 25 ma, which is the suggested minimum value of i dq . for special applications such as linear amplification, i dq may have to be selected to optimize the critical pa- rameters. the gate is a dc open circuit and draws no current. therefore, the gate bias circuit may generally be just a simple resistive divider network. some special applications may require a more elaborate bias system. gain control power output of the mrf137 may be controlled from its rated value down to zero (negative gain) by varying the dc gate voltage. this feature facilitates the design of manual gain control, agc/alc and modulation systems. (see figure 9.) amplifier design impedance matching networks similar to those used with bipolar vhf transistors are suitable for mrf137. see m/a - com application note an721, impedance matching networks applied to rf power transistors. the higher input impedance of rf mos fets helps ease the task of broadband network de- sign. both small signal scattering parameters and large signal impedances are provided. while the s C parameters will not produce an exact design solution for high power operation, they do yield a good first approximation. this is an additional advantage of rf mos power fets. rf power fets are triode devices and, there- fore, not unilateral. this, coupled with the very high gain of the mrf137, yields a device capable of self oscillation. stability may be achieved by techniques such as drain loading, input shunt resistive loading, or output to input feedback. two port parameter stability analysis with the mrf137 s C parameters provides a useful tool for selection of loading or feedback cir- cuitry to assure stable operation. see m/a - com ap- plication note an215a for a discussion of two port network theory and stability.
the rf mosfet line: broadband rf power fet 5.0w, to 400mhz, 28v rev. v1 mrf134 12 12 m/a - com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: https://www.macom.com/support 12
the rf mosfet line: broadband rf power fet 5.0w, to 400mhz, 28v rev. v1 mrf134 13 13 m/a - com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: https://www.macom.com/support 13 m/a - com technology solutions inc. all rights reserved. information in this document is provided in connection with m/a - com technology solutions inc ("macom") products. these materials are provided by macom as a service to its customers and may be used for informational purposes only. except as provided in macom's terms and conditions of sale for such products or in any separate agreement related to this document, macom assumes no liability whatsoever. macom assumes no responsibility for errors or omissions in these materials. macom may make changes to specifications and product descriptions at any time, without notice. macom makes no commitment to update the information and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to its specifications and product descriptions. no license, express or implied, by estoppels or otherwise, to any intellectual property rights is granted by this document. these materials are provided "as is" without warranty of any kind, either express or implied, relating to sale and/or use of macom products including liability or warranties relating to fitness for a particular purpose, consequential or incidental damages, merchantability, or infringement of any patent, copyright or other intellectual property right. macom further does not warrant the accuracy or completeness of the information, text, graphics or other items contained within these materials. macom shall not be liable for any special, indirect, incidental, or consequential damages, including without limitation, lost revenues or lost profits, which may result from the use of these materials. macom products are not intended for use in medical, lifesaving or life sustaining applications. macom customers using or selling macom products for use in such applications do so at their own risk and agree to fully indemnify macom for any damages resulting from such improper use or sale.

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