DESIGN FEATURES Amplifier with Integrated Filter Offers
the Best High Speed, Low Noise
Interface for Differential
by Michael Kultgen
DACs and ADCs
Introduction
Differential signal paths are becoming a popular way to improve system
performance. A differential signal has
twice the amplitude for a given supply
level. Interference from other components, digital clocks for example,
become common mode signals and
are rejected by the amplifiers in the
differential signal chain. Hence, with a
differential signal path, dynamic range
can be maintained while the supply
voltage is reduced.
Differential output op amps are
one means of providing gain, buffering, and filtering in these signal
paths, but often at the price of added
complexity and board real estate. A
circuit using a differential output
op amp typically requires twice the
number of resistors and capacitors …