ACTIVE FILTER

ACTIVE FILTER

An active filter circuit. Two cascaded phase shift networks are in circuit with the non-inverting input terminal of an operational amplifier. A resistive feedback network couples the amplifier output back to the first of the phase shift networks. When an external input signal is applied to both phas...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: JERRY L. HOLSINGER
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
RESONATORS
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Beschreibung
Zusammenfassung:An active filter circuit. Two cascaded phase shift networks are in circuit with the non-inverting input terminal of an operational amplifier. A resistive feedback network couples the amplifier output back to the first of the phase shift networks. When an external input signal is applied to both phase shift networks and the inverting input terminal of the amplifier, the filter circuit has a pass band and a stop band. Inputs to any single one of these points selectably provide high-pass, low-pass and band-pass operation.