Introduction 3Signal Requirements for Analog to Digital Converters 3I. OPERATIONAL AMPLIFIERS: Review of Theory 3Feedback Control Theory 3Feedback and the Operational Amplifier Bode Plot 5Amplifier Configurations and Feedback 7Some Other Error Sources 8Noise and its Effects on Measurement 11Settling Time 14II. THE CS5016 A/D CONVERTER INPUT STRUCTURE 15III. EXAMPLE BUFFER CIRCUITS 18Buffer Circuit Test Method 18Benefits of an RC Isolation Network 18±5 Volt Supply Op Amp Circuits 19±15 Volt Supply Op Amp Circuits 19Achieving ±4.5 Volt Output with ±5 Volt Supplies 20An Instrumentation Amplifier Circuit 20Signal Limiting Circuits 20Voltage Clamping via the Compensation Pin 22A Novel Method to Aid Current Limiting 22List of References 24