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Application Notes
Introduction
Matching applications play a key role in modern IC design: they act as the heart of a system on a chip (SOC) IC by providing a buffer between the exterior analog world and the IC’s internal digital circuitry. These matching applications depend on the fine analog matching characteristics of transistors, resistors, and capacitors found in today’s IC process technologies. For example, a cellular phone receiver or transmitter uses a high-frequency mixer or modulator that requires accurate transistor matching in several circuits. These circuits include analog-to-digital and digital-to-analog (AD/ DA) converters, which use both transistor matching and resistor or capacitor techniques, as well as operational amplifiers, which depend upon the precise matching of transistors and resistors. In the past, these analog circuit blocks were separate components that were connected to the digital ICs on a circuit board. With the advent of the SOC paradigm, however, these circuit blocks are now integrated into a single IC, both to increase performance and to reduce cost.
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