CMD249K5 - DC-20 GHz GaAs Distributed PA | Qorvo | RF Amplifier
MPN： CMD249K5 ✓ 啟用中CMD249K5 概覽
A distributed power amplifier is a specialized RF amplifier topology that uses the absorption principle of transmission lines to achieve broad bandwidth. Unlike traditional reactively-matched amplifiers whose gain rolls off with frequency, distributed amplifiers maintain flat gain over many octaves by absorbing the parasitic gate and drain capacitances of multiple transistor cells into artificial transmission lines. Distributed amplifiers therefore belong to the broader family of broadband RF amplifiers, themselves a subset of microwave ICs within the RF & Wireless product category. The CMD249 family exploits this topology to deliver usable gain from near-DC up to millimeter-wave frequencies in a single, unconditionally-stable stage.
Key features of the CMD249 family include full DC to 20 GHz operational bandwidth, +30 dBm output P1dB, +38 dBm OIP3, 12 dB small-signal gain, 50 ohm input/output match eliminating external matching components, full passivation for enhanced reliability, and 100% DC testing on the wafer. The bare-die form factor requires wirebond or flip-chip interconnect to the host PCB. Compared with reactively-matched power amplifiers that cover only a narrow band, the CMD249K5 trades saturated efficiency for bandwidth - it is the part of choice for instrumentation, EW, and multi-band radar where flat response over many octaves matters more than peak PAE.
Typical applications include wideband military EW (electronic warfare) jamming and receiver systems, fiber-optic communication drivers, test and measurement instrumentation, multi-band radar, microwave backhaul, and broadband IF/RF gain blocks. The broadband response also makes the CMD249 family suitable as a generic gain block when the system requires a single amplifier covering multiple downstream frequency plans.
Designers should note that GaAs distributed amplifiers dissipate substantial DC power (typically several hundred mA at +5 to +8 V supply) and require careful thermal management even at small duty cycles. The bare die format means ESD handling and clean-room assembly practices are mandatory. Designers should also evaluate the trade-off between the CMD249 family's broadband coverage and the higher efficiency of a narrowband power amplifier if the end application only requires a single band.
直接替換替代品，適用於 CMD249K5 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此產品無可直接替換的替代品。
申請替代品CMD249K5 最大額定值與電氣特性
| Product Type | Distributed Power Amplifier MMIC |
| Technology | GaAs pHEMT |
| Frequency Range | DC to 20 GHz |
| Small-Signal Gain | >12 dB |
| Output P1dB | +30 dBm |
| Output IP3 (OIP3) | +38 dBm at 10 GHz |
| Input/Output Impedance | 50 ohm matched |
| Passivation | Full passivation |
| DC Test | 100% on-wafer DC tested |
CMD249K5 standard 腳位配置指南
CMD249K5（standard 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： CMD249K5.
請參閱 資料表 以查看完整腳位配置。
典型應用
CMD249K5 適用於 6 應用s: Wideband Electronic Warfare (EW) Receiver, Fiber-Optic Communication Driver, Test and Measurement Instrumentation, Multi-Band Radar IF/RF Gain Block, Microwave Backhaul Link Amplifier, Broadband IF/RF Gain Block (Generic).
Wideband Electronic Warfare (EW) Receiver
The CMD249K5's DC-20 GHz bandwidth and +30 dBm output P1dB make it an excellent front-end gain stage for wideband EW receivers that must detect and process threats across multiple frequency bands simultaneously. According to the Qorvo CMD249 family datasheet, the 12 dB gain provides useful front-end boost before the signal is split among down-conversion channels, while the +38 dBm OIP3 ensures that strong signals do not generate intermodulation products that mask weaker threats. The 50 ohm matched design eliminates external matching components and simplifies the broadband signal path.
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Fiber-Optic Communication Driver
Wideband optical modulator drivers require flat gain and high linearity across multi-GHz bandwidths - the CMD249K5's DC-20 GHz response and +38 dBm OIP3 deliver both. According to the Qorvo CMD249 family datasheet, the +30 dBm P1dB allows the amplifier to drive external electro-optic modulators (Mach-Zehnder, EAM) at swing levels required for high-extinction loss optical data transmission. The 50 ohm input and output match simplifies integration with the 50 ohm environment typical of fiber-optic transmitter assemblies.
推薦
Test and Measurement Instrumentation
Broadband test instruments such as network analyzers, signal generators, and spectrum analyzers require wideband gain blocks that maintain flat response across the full operating frequency range. The CMD249K5's DC-20 GHz bandwidth, 12 dB flat gain, and 50 ohm match allow it to be used as a generic gain block or output driver in such instruments. According to the Qorvo CMD249 family datasheet, the +30 dBm P1dB provides headroom for high-power signal delivery, while full passivation enhances reliability in production test systems.
推薦
Multi-Band Radar IF/RF Gain Block
Multi-band radar systems require broadband RF amplification between antenna, mixer, and ADC stages. The CMD249K5's DC-20 GHz bandwidth covers most radar IF and many RF bands, while the +30 dBm P1dB provides sufficient drive level for ADC inputs or downstream mixers. According to the Qorvo CMD249 family datasheet, the +38 dBm OIP3 preserves dynamic range in dense-signal environments. The GaAs pHEMT process provides low noise figure compared to lower-frequency silicon processes at these frequencies.
推薦
Microwave Backhaul Link Amplifier
Point-to-point microwave backhaul links operating from 6 to 42 GHz require broadband gain stages at the lower-frequency intermediate bands. The CMD249K5's DC-20 GHz response covers the entire IF spectrum used in such links. According to the Qorvo CMD249 family datasheet, the 50 ohm input/output match and full passivation simplify outdoor unit (ODU) integration, while the +30 dBm P1dB provides useful drive for the up-conversion mixer. Broadband flatness also supports multi-carrier modulation schemes.
推薦
Broadband IF/RF Gain Block (Generic)
When a system requires a single amplifier to cover multiple downstream frequency plans (for example, a software-defined radio covering HF through K-band), the CMD249K5's DC-20 GHz bandwidth delivers the broadest single-part coverage. According to the Qorvo CMD249 family datasheet, the 12 dB flat gain and 50 ohm match make it a drop-in generic gain block, while the +30 dBm P1dB gives meaningful output drive. The GaAs pHEMT technology provides lower noise figure than silicon at millimeter-wave frequencies.
推薦
推薦產品摘要
工程參考資料，適用於 CMD249K5 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | CMD240 | CMD241 | CMD242 | CMD243 | CMD245 |
|---|---|---|---|---|---|---|
| Brand | Qorvo | Qorvo | Qorvo | Qorvo | Qorvo | Qorvo |
| Frequency Range | DC to 20 GHz | DC to 22 GHz | DC to 20 GHz | DC to 15 GHz | 2 to 20 GHz | DC to 20 GHz |
| Output P1dB | +30 dBm | +18 dBm | +22 dBm | +26 dBm | +27 dBm | +30 dBm |
| Small-Signal Gain | >12 dB | 11 dB | 13 dB | 11 dB | 10 dB | 13 dB |
| Technology | GaAs pHEMT | GaAs pHEMT | GaAs pHEMT | GaAs pHEMT | GaAs pHEMT | GaAs pHEMT |
| Input/Output Match | 50 ohm | 50 ohm | 50 ohm | 50 ohm | 50 ohm | 50 ohm |
| Architecture | Distributed | Distributed | Distributed | Distributed | Distributed | Distributed |
主要差異化特點
- Wide DC-20 GHz instantaneous bandwidth (對比Narrowband reactively-matched PAs (e.g., 2.4 GHz Wi-Fi PAs))
- +30 dBm output P1dB at 10 GHz (對比Lower-power distributed amplifiers in CMD240 family (e.g., CMD240 +18 dBm))
- 50 ohm matched I/O eliminates external matching (對比Unmatched MMIC amplifiers requiring external LC matching networks)
設計說明
Estimated: The CMD249K5 is a GaAs distributed power amplifier that typically dissipates 600 mW to 2 W depending on bias and output power. Designers should bond the die to a high-thermal-conductivity carrier (AuSn or equivalent) and provide a low-thermal-resistance path to the host PCB ground pour. Even at moderate bias, junction temperature should be kept below 150C; without thermal management, MMIC reliability degrades rapidly. Use multiple bondwires for ground and drain to reduce parasitic inductance and improve thermal spreading.
The CMD249K5 die requires 50 ohm transmission line interconnects on both input and output, routed with controlled-impedance substrate (e.g., Rogers RO4003C for >10 GHz performance). Wirebond lengths should be minimized (typically <0.5 mm) to limit parasitic inductance that would otherwise degrade gain above 15 GHz. ESD handling requires Class 1A HBM controls during assembly because bare GaAs die has very limited ESD tolerance.
Do not apply RF input power before applying DC bias - the GaAs pHEMT process is highly sensitive to input signal with no drain voltage. Use sequenced bias supplies (gate before drain) or gate-clamping circuits to protect the die. Confirm bias sequencing in the CMD249 family datasheet. Additionally, do not exceed the absolute maximum RF input power (~+20 dBm continuous wave); above this, catastrophic die failure is likely.
合規資訊
Compliance status not stated in the verified web data for CMD249K5. Bare GaAs MMIC die products are sometimes exempt from RoHS under category 8/9 military/aerospace exemptions; confirm with Qorvo product documentation.
