Abstract
This chapter focuses on the requirements for the op amp and a number of techniques used in wireless communication systems to interface high-speed op amps to analog to digital converters (ADCs) and digital to analog converters (DACs). High-speed operational amplifiers (op amps) are used extensively in wireless communication systems. These amplifiers typically operate at intermediate frequencies (IF) less than or equal to 500 MHz and most frequently operate below 25 MHz. Applications for high-speed op amps include filtering circuits in radio receivers, IF amplifiers, mixer circuits, and bandpass amplifiers. In communication applications, the DC nonlinearity specifications that describe the converter's static performance are less important than the dynamic performance of the ADC. The receiver (overall system) specifications depend very much on the ADC dynamic performance parameters: effective number of bits, spurious free dynamic range (SFDR), total harmonic distortion, and signal to noise ratio. Good dynamic performance and fast sampling rate are required for accurate conversion of the baseband analog signal at RF or IF frequencies. The SFDR specification describes the converter's in band harmonic characterization, and it represents the converter's dynamic range.
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