ADL5320 and ADL5534 RF Amplifiers

Analog Devices' ADL5534 contains two broadband, fixed-gain, linear amplifiers and operates at frequencies up to 500 MHz. The device can be used in a wide variety of equipment, including cellular, satellite, broadband, and instrumentation equipment.

The ADL5534 has a fixed gain of 20 dB, which is stable over frequency, temperature, power supply, and from device-to-device. The amplifiers are single-ended and internally matched to 50 Ω. Only input/output ac- coupling capacitors, power supply decoupling capacitors, and an external bias inductor are required for operation of each amplifier.

The ADL5320 incorporates a dynamically adjustable biasing circuit that allows for the customization of OIP3 and P1dB performance from 3.3 V to 5 V without the need for an external bias resistor. This feature gives the designer the ability to tailor driver amplifier performance to the specific needs of the design. This feature also creates the opportunity for dynamic biasing of the driver amplifier, where a variable supply is used to allow for full 5 V biasing under large signal conditions and then can reduce the supply voltage when signal levels are smaller and lower power consumption is desirable. This scalability reduces the need to evaluate and inventory multiple driver amplifiers for different output power requirements from 22 dBm to 2 6 dBm output power levels.