添加数字调整到连续时间筛选器

摘要： 这个设计备注显示如何添加的数模转换器 （Dac） 提供数字调谐到连续时间筛选器。双重过滤、 双运算放大器和双通道 DAC 20 kHz 中心频率范围 5 To 上形成不断的 500 Hz 通可调带通电路。在这个设计中精选了 MAX275 连续时间筛选器和 MAX412 运算放大器。

Maxim > App Notes > Filter Circuits (Analog)
Keywords: filters, switched-capacitor filters, continuous-time filters Jul 09, 1998

APPLICATION NOTE 63
Add Digital Adjustment to Continuous-Time Filters


Abstract:This design note shows how adding digital-to-analog converters (DACs) provides digital tuning to continuous-time filters.
A dual filter, dual op amp, and dual DAC form an adjustable bandpass circuit with a constant 500Hz bandpass over the 5kHz to
20kHz center-frequency range. The MAX275 continuous-time filter and MAX412 op amp are featured in this design.

Tuned-bandpass applications often incorporate switched-capacitor filters―these filters enable a sweep of the bandpass center
frequency by simply sw