1. 數位控制（二）

2. Introduction to Discrete-Time Control System
Digital Controller
Use of digital controller
Decision-making capability
Low cost digital computer
Optimal performance
Plant: a physical object to be controlled.
Furnace, Reactor, Servo system, spacecraft
Process: a series of gradual changes that succeed one another.

3. Signals Sampling process Continuous-time signal Sampled-data signal
Digital signal
Discrete-time signal
Sampling process
Quantization
A sequence of value at discrete time points
Denoted by kT or tk (k = 0,1, 2,…)
Sampling rate

4. Signals

5. Digital control system

6. Data Acquisition and Data Distribution

7. Transducer
Amplifier
Amplify the voltage of the transducer
Convert a current signal to a voltage signal
A buffer
Low-pass filter: attenuate the high-frequency signal, such as noise signals.
Analog multiplexer
De-multiplexer

8. Analog multiplexer

9. Sample-and-Hold (S/H)

10. Analog-to-Digital Converter (ADC)
Successive-approximation type
Integrating type
Counter type
Parallel type

12. Offset error
Linearity error
Gain error

13. Digital-to-Analog Converter (DAC)
Weighted resistors

14. R-2R ladder circuit

15. hold
Zero-order hold, First-order hold, Polygonal hold

16. 飛行器控制系統