An Interesting Filter Fall 2003 ECPE 141 – Advance Circuits Author: Henry Pham.

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Presentation transcript:

An Interesting Filter Fall 2003 ECPE 141 – Advance Circuits Author: Henry Pham

Objectives Design Specs and Transfer Function Circuit Simulations & Results Interesting Facts References

Design Specs & Transfer Function 2 nd Order Salleen- Key HPF 2 nd Order Salleen- Key LPF Inverting Amplifier

Circuit Schematic (Dorf SP16.5)

Realized Circuit Real Circuit Cleaned Up for Reimplementation

Circuit Simulations & Results Measured Gain and Spice Gain Measured and Spice dB Gain

Continue Measured and Spice Phase Angle

Continue Transient Response of the Interesting Filter

What happens to the circuit when you replace one capacitor?

Capacitor Change Simulations Frequency Response Transient Response

Why is it an Interesting Filter? Lower Stop Frequency at 16Hz 20db/decade Upper Stop Frequency at 320Hz 20db/decade Roll-Off at 310kHz 75db/decade

More Interesting Facts Resistors connecting the entire circuit directly affect gain.

References 1. Al – Hewlett Packard, Design Engineer 2. Joe Carr’s Radio Tech Notes. Filter, Attenuator, Preamplifier, Preselector - - or Barefoot Dorf & Svoboda. Introduction to Electrical Circuits Fellow Students and Dr. Khoie

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