Voltage-Controlled Amplifiers
AD603Analog Devices   Low Noise, Voltage-Controlled Amplifier For Use In RF And IF AGC Systems 
AD604Analog Devices   Ultralow Noise, Accurate, Dual Channel, Linear-In-dB Voltage-Controlled Amplifier 
VCA610Texas Instruments   Wideband Voltage Controlled Amplifier 

ChipCatalog.com - Your Source of Information About Electronic Components