Abstract
This chapter discusses high-performance amplification. High-performance amplification is applied as analog preprocessing for analog-to-digital converters such as postprocessing for digital-to-analog converters and for instrumentation such as oscilloscope amplifiers. The chapter describes single-stage amplifiers and novel subsystem-level amplifier topologies involving multiple signal paths. The transistor diff-amp amplifies differential input voltages and not currents. Because of the Miller effect and the dominance of stray capacitance over stray inductance, alternate current (ac) voltages are more easily degraded than ac currents. It is, thus, desirable to have op-amp topologies that sum currents instead of voltages at their inputs. The feedback amplifier has a noninverting high-impedance voltage input and an inverting low-impedance current input. This strange combination has some advantages over feedback amplifiers with voltage-differencing inputs. Current-feedback amplifiers also have a large-signal advantage over voltage op-amps. The chapter discusses multipliers and programmable-gain amplifiers. The large-signal behavior of current-feedback amplifiers does not have the slew-rate limitation on input dynamic range. The current-feedback concept also applies to instrumentation amplifiers.
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