{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

1 1 10 100 1000 analog usually use an op amp circuit

Info iconThis preview shows page 1. Sign up to view the full content.

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

Unformatted text preview: ! Usually use an op-amp circuit Often found as a pre-amplifier to ADC circuitry Simple circuit to computer natural logarithm Map binary values to analog outputs (voltages) Most devices have a digital interface – use time to encode value Time-varying digital signals – almost arbitrary resolution pulse-code modulation (data = number or width of pulses) pulse-width modulation (data = duty-cycle of pulses) frequency modulation (data = rate at which pulses occur) V VIN VOUT = loge ( VIN ) V V t t t 1 #$ %& $ ( Pulse a digital signal to get an average “analog” value The longer the pulse width, the higher the voltage Pulse-width ratio = tperiod tperiod $ & ) Most mechanical systems are low-pass filters Consider frequency components of pulse-width modulated signal Low frequency components affect components ton They pass through average value ton $ %& High frequency components are too fast to fight inertia They are “filtered out” Electrical RC-networks are low-pass filters t Time constant (τ = RC) sets “cutoff” frequency that separates low and high frequencies t t " % ' - )+ ) & . % )+ ) Re...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online