lec16_handout

lec16_handout - ME365 Signal Conditioning 1 Signal...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ME365 Signal Conditioning 1 Signal Conditioning (I) • Filters – Passive Filters (L, R, C circuits) – Active Filters (Op Amp circuits) • Loading Effect – Energy Flow Between Two Subsystems • Operational Amplifiers – “Golden Rules” – Op Amp Circuits ME365 Signal Conditioning 2 Anti-Aliasing Filter an analog filter that removes signal frequencies above f s /2, where f s is the sample frequency Amplifier Low-pass Filter ADC Input Signal Computer ME365 Signal Conditioning 3 Filters • Characterized in the frequency domain through frequency response function. • Can be implemented using passive elements (R,L,C), active elements (Op Amps, transistors) or digital components . Filter G ( j ω ) Input Output x(t) y(t) Electrical Quantities: Voltage, Current, Impedance ... Electrical Quantities: Voltage, Current, Impedance ... Adjust Gain (Scaling); “Clean up” Noise; Isolate Interested Signal; Change frequency range; Integrate; Differentiate; ... ME365 Signal Conditioning 4 • Low Pass Filters (LP) Frequency Response – K : Static Sensitivity (Gain) τ : Time Constant – Cut-off Frequency ( ω C ) At ω C , Passive Filters 10-1 10 10 1-30-60-90 Frequency (rad/sec) Phase deg 10-1 10 10 1-30-20-10 Gain dB Bode Plot for a 1st Order Low Pass Filter ܩ ݆߱ ൌ ܭ ݆߬߱ ൅ 1 ME365 Signal Conditioning 5 • Low Pass Filters (LP) Passive Implementation (RC Network) Impedance (Z) Analysis: – Resistance ( Z R ): – Capacitance ( Z C ): Passive Filters...
View Full Document

This note was uploaded on 12/26/2011 for the course ME 365 taught by Professor Merkle during the Fall '07 term at Purdue.

Page1 / 11

lec16_handout - ME365 Signal Conditioning 1 Signal...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online