An amplifier assembly receives an input signal including multiple
frequency channels. A first stage amplifier amplifies the input signal,
to produce at an output thereof an amplified first signal including the
multiple frequency channels. A plurality of second stage amplifiers have
their respective inputs coupled to an output of the first stage
amplifier. Each second stage amplifier amplifies the amplified first
signal, to produce at its respective output a respective second amplified
signal including the multiple frequency channels. The first stage
amplifier and the second stage amplifiers are variable gain amplifiers,
and are constructed on a common Integrated Circuit (IC) substrate.