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CIRCUIT060056

Band-pass Sallen-Key filter circuit

CIRCUIT060056

Overview

This circuit is a single-supply, 2nd-order Sallen-Key (SK) band-pass (BP) filter. It is designed by cascading an SK low-pass filter and an SK high-pass filter. Vref provides a DC offset to accommodate for a single supply.
Features
  • Input: Vi = -2.45 V to 2.45 V
  • Output: Vo = 0.05 V to 4.95 V
  • Supply:
    • Vcc = 5 V
    • Vee = 0 V
  • Gain: 1 V/V
  • Low cutoff frequency: 1 kHz
  • High cutoff frequency: 10 kHz
  • Vref = 2.5 V
General-purpose op amps
TLV316 — Single, 5.5-V, 10-MHz, RRIO operational amplifier TLV9062 — Dual, 5.5-V, 10-MHz operational amplifier
Precision op amps (Vos<1mV)
OPA325 — Low noise (10nV/rtHz), wide bandwidth (10MHz), low power (0.65mA), zero crossover op amp
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Technical documentation

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Type Title Date
Application note FilterPro™ MFB and Sallen-Key Low-Pass Filter Design Program User Guide (Rev. C) 25 Feb 2011
Application note Basic Introduction to Filters - Active, Passive, and Switched-Cap (Rev. A) 21 Apr 2010
Application note Analysis of the Sallen-Key Architecture (Rev. B) 13 Sep 2002

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