آر اف (فرکانس رادیویی) و بی‌سیم تقویت‌کننده‌ آر اف

Product Attributes

Introduction

The ADCA3952 is a power doubler hybrid module packaged in the industry-standard SOT-115J package. The device achieves high RF output, up to 73.3 dBmV total composite power with 9 dB tilt, by using advanced circuit design techniques, such as gallium arsenide (GaAs), pseudomorphic high electron transistor (pHEMT), and gallium nitride (GaN) HEMT technologies. The dc current can be adjusted externally for optimum distortion performance vs. power consumption over a range of output levels. The ADCA3952 provides high gain, simplifying the design and manufacturing of DOCSIS 3.1 infrastructure equipment. The ADCA3952 is a 75 Ω input and output matched module designed for CATV applications. The ADCA3952 uses cascode field effect transistor (FET) feedback amplifiers in a Class A, push pull configuration. The bottom half of the cascode stages are implemented in a single die, linear FET process that minimizes parasitics, thereby enabling higher gain. The top devices in the cascodes are implemented using a linear GaN process able to swing high RF voltages. The frequency of operation is from 45 MHz to 1218 MHz. Internally, the ADCA3952 module uses a balun to convert the input signal to a balanced signal that feeds the active stages. An output impedance transformer and balun combination converts the balanced GaN signals to an unbalanced 75 Ω output. The output transformer also feeds the dc to the active stages and cancels second-order distortion products coming from the active devices. The module has a bias control pin (IADJ) that can set the dc current consumption from low bias to the full bias of the device by connecting a resistor from the IADJ pin to ground or by the use of a positive voltage. The ADCA3952 is unconditionally stable and includes transient and surge protection circuits for robust operation in systems targeting DOCSIS 3.1 and legacy DOCSIS standards.

Features

• Total composite power: 73.3 dBmV
• High power gain: 25.0 dB at 1218 MHz
• Excellent linearity
• Very low distortion Composite triple beat: −80 dBc typical Composite second-order: −78 dBc typical Carrier to intermodulation noise: 58 dB typical
• Low noise figure: 3 dB at 45 MHz and 4 dB at 1218 MHz
• Unconditionally stable
• Transient and surge protection
• Configurable current: 250 mA to 490 mA at 24 V

Applications

• 45 MHz to 1218 MHz community access television (CATV) infrastructure amplifier systems
• Remote physical layer (PHY)
• DOCSIS 3.1 compliant