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Combinational Logic: Analog Switches

Analog switches
Example: 74VHC4066

An analog switch can conduct an analog signal such as a sine-wave signal in either direction. It passes a signal when on and blocks it when off.
An analog switch is composed of a pair of n-channel and p-channel MOSFETs connected in parallel in order to reduce on-resistance and improve the linearity of I/O characteristics.
The datasheet for the analog switch shows typical sine-wave distortion, maximum frequency response, feed-through attenuation, crosstalk, and other specifications as analog switch characteristics. The following shows the logic symbol, truth table, timing diagram, and logic schematic of an analog switch.

Logic symbol and truth table of an analog switch
Logic symbol and truth table of an analog switch
Timing diagram of an analog switch
Timing diagram of an analog switch
Logic schematic of an analog switch
Logic schematic of an analog switch

Chapter3 Basic CMOS Logic ICs

Basic CMOS Logic ICs
Combinational Logic: Inverters and Buffers
Combinational Logic: Bidirectional Bus Buffers
Combinational Logic: Schmitt-Trigger Devices
Combinational Logic: Decoders
Combinational Logic: Multiplexers
Combinational Logic: Analog Multiplexer/Demultiplexers
Sequential Logic: Latches
Sequential Logic: Flip-Flops
Sequential Logic: Counters
Sequential Logic: Shift Registers

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