ADC Converts analog signals
into digital signals
Analog Digital
Sample
& Hold
Quantization
fsample
, Sampling
• Reduction of a continuous signal to a discrete signal
• Achieved through sampling and holding circuit
• Switch ON – sampling of signal (time to charge capacitor w/ Vin)
• Switch OFF - voltage stored in capacitor (hold operation)
• Must hold sampled value constant for digital conversion
, Sampling
• Sampling can be defined as a
transformation or operation that acts
on a continuous-time signal x(t) to
produce an output which is a
corresponding discrete-time signal
x[n].
• Sinusoidal waveforms of the form
• x(t) = Acos(ω0t + ɸ)
• are examples of continuous-time
signals
, • It is also common to refer to such signal
as analog signals because both the signal
amplitude and the time variable are
assumed to be real (not discrete)
numbers. Continuous-time signals are
represented mathematical by functions
of time, x(t), where t is a continuous
variable.
into digital signals
Analog Digital
Sample
& Hold
Quantization
fsample
, Sampling
• Reduction of a continuous signal to a discrete signal
• Achieved through sampling and holding circuit
• Switch ON – sampling of signal (time to charge capacitor w/ Vin)
• Switch OFF - voltage stored in capacitor (hold operation)
• Must hold sampled value constant for digital conversion
, Sampling
• Sampling can be defined as a
transformation or operation that acts
on a continuous-time signal x(t) to
produce an output which is a
corresponding discrete-time signal
x[n].
• Sinusoidal waveforms of the form
• x(t) = Acos(ω0t + ɸ)
• are examples of continuous-time
signals
, • It is also common to refer to such signal
as analog signals because both the signal
amplitude and the time variable are
assumed to be real (not discrete)
numbers. Continuous-time signals are
represented mathematical by functions
of time, x(t), where t is a continuous
variable.
