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AC and Op Amp Provide Variable Control Voltage: 12/06/01 EDN
Design Ideas / (added 6/06) Early DACs contained standard R-2R ladder networks, and produced a negative output voltage. These early DACs,
such as MAX7837/7847 and MAX523, require both positive and negative supply rails to accommodate ir negative output. With transition to
single-supply ICs, however, many modern DACs operate with a single supply rail and an inverted R-2R ladder network. .
Amplifier Requires No DC Bias: 03/16/00 EDN-Design Ideas /
(added 11/05) Intrinsically capacitive transducers and or high-impedance signal sources usually require ac coupling and a buffer amplifier to
condition signal for furr processing. Buffers take many forms, but most of m compromise signal quality through use of external resistors
that provide a dc path for input bias current. Recent improvements in op-amp technology allow ac-coupled inputs without need for bias
resistors. The new op amps have inputs that operate within supply-voltage span. Some are CMOS, but many use complementary bipolar
transistors. For latter, each input connects....
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