MRF136 The RF MOSFET Line 15W, to 400MHz, 28V Rev. V2 Product Image Designed for wideband large signal amplifier and oscillator applications Up to 400 MHz range, in single-ended configuration N–Channel enhancement mode .  Guaranteed 28 volt, 150 MHz performance Output power = 15 watts Narrowband gain = 16 dB (Typ.) Efficiency = 60% (Typ.)  Small– and large–signal characterization  100% tested for load mismatch at all phase angles with 30:1 VSWR  Excellent thermal stability, ideally suited for Cass A operation  Facilitates manual gain control, ALC and modulation techniques 111 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

MRF136 The RF MOSFET Line 15W, to 400MHz, 28V Rev. V2 222 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

MRF136 The RF MOSFET Line 15W, to 400MHz, 28V Rev. V2 333 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

MRF136 The RF MOSFET Line 15W, to 400MHz, 28V Rev. V2 444 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

MRF136 The RF MOSFET Line 15W, to 400MHz, 28V Rev. V2 555 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

MRF136 The RF MOSFET Line 15W, to 400MHz, 28V Rev. V2 666 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

MRF136 The RF MOSFET Line 15W, to 400MHz, 28V Rev. V2 777 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

MRF136 The RF MOSFET Line 15W, to 400MHz, 28V Rev. V2 888 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

MRF136 The RF MOSFET Line 15W, to 400MHz, 28V Rev. V2 999 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

MRF136 The RF MOSFET Line 15W, to 400MHz, 28V Rev. V2 111000 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

MRF136 The RF MOSFET Line 15W, to 400MHz, 28V Rev. V2 RF POWER MOSFET CONSIDERATIONS DESIGN CONSIDERATIONS resistive divider network. Some special applications may The MRF137 is a RF power N–Channel enhancement- require a more elaborate bias system. mode field–effect transistor (FET) designed especially for GAIN CONTROL VHF power amplifier applications. M/A-COM RF MOS Power output of the MRF137 may be controlled from FETs feature a vertical structure with a planar design, thus its rated value down to zero (negative gain) by varying the avoiding the processing difficulties associated with V– dc gate voltage. This feature facilitates the design of man- groove vertical power FETs. ual gain control, AGC/ALC and modulation systems. (See M/A-COM Application Note AN211A, FETs in Theory and- Figure 9.) Practice, is suggested reading for those not familiar with AMPLIFIER DESIGN the construction and characteristics of FETs. Impedance matching networks similar to those used The major advantages of RF power FETs include high with bipolar VHF transistors are suitable for MRF137. See gain, low noise, simple bias systems, relative immunity M/A-COM Application Note AN721, Impedance Matching from thermal runaway, and the ability to withstand severely Networks Applied to RF Power Transistors. The higher mismatched loads without suffering damage. Power output input impedance of RF MOS FETs helps ease the task of can be varied over a wide range with a low power dc con- broadband network design. Both small signal scattering trol signal, thus facilitating manual gain control, ALC and parameters and large signal impedances are provided. modulation. While the s–parameters will not produce an exact design solution for high power operation, they do yield a good first DC BIAS approximation. This is an additional advantage of RF MOS The MRF137 is an enhancement mode FET and, there- power FETs. fore, does not conduct when drain voltage is applied. Drain RF power FETs are triode devices and, therefore, not current flows when a positive voltage is applied to the gate. unilateral. This, coupled with the very high gain of the See Figure 10 for a typical plot of drain current versus gate MRF137, yields a device capable of self oscillation. Stabil- voltage. RF power FETs require forward bias for optimum ity may be achieved by techniques such as drain loading, performance. input shunt resistive loading, or output to input feedback. The value of quiescent drain current (IDQ) is not critical Two port parameter stability analysis with the MRF137 s– formany applications. The MRF137 was characterized at parameters provides a useful tool for selection of loading or IDQ = 25 mA, which is the suggested minimum value of IDQ. feedback circuitry to assure stable operation. See M/A- For special applications such as linear amplification, IDQ COM Application Note AN215A for a discussion of two port may have to be selected to optimize the critical parameters. network theory and stability. The gate is a dc open circuit and draws no current. There- fore, the gate bias circuit may generally be just a simple LOW NOISE OPERATION Input resistive loading will degrade noise performance, and noise figure may vary significantly with gate driving imped- ance. A low loss input matching network with its gate im- pedance optimized for lowest noise is recommended. 111111 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

MRF136 The RF MOSFET Line 15W, to 400MHz, 28V Rev. V2 111222 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

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