The primary function of an analog switch is to achieve the signal chain switching. It uses the MOSFET switching method to either connect or disconnect the signal path, thereby enabling functions such as signal switching, isolation, selection, conditioning, and transmission.
Analog switch is widely used across various industries such as mobile phones & portable devices, network communications & servers, industrial control systems, automotive electronics, and so on.
view 1, 2 analog switch principle
WAYON has developed General-purpose Analog Switch, High-Speed USB Analog Switch, Audio Analog Switch product lines to support our broad customer base and wide range of applications.
Ideally an analog switch should possess two key characteristics: when conducting, the resistance is zero, allowing the signal to transmit without any attenuation or distortion, ensuring that the output is identical to the input; when open, the resistance should approach infinity, ensuring complete isolation between the two signals and preventing any interference. Under such ideal conditions, the input and output terminals of the switch can be flexibly interchanged based on the actual drive requirements
However, in practice, analog switches are affected by numerous parasitic effects that impact system performance. In the conducting state, there is inevitably some resistance and capacitance between the input and output. The combined effect of these factors causes varying degrees of attenuation and distortion in the input signal. In the off state, there is also a certain residual resistance and capacitance between the input and output, which results in a weak coupling between the output and input, impossible to achieve complete isolation.
WAYON high performance analog switches have the following features in response to the application requirements:
1、Low power consumption
2、Overvoltage protection
3、Low On-resistance
4、High bandwidth
5、High Off-State Isolation
6、Crosstalk Suppression
7、Enhanced ESD Protection
8、Wide Operating Temperature Range: -40°C ~ 85°C
Analog switch main electrical parameters are voltage range, on-resistance, X-talk, isolation, BW, eye diagram
1、Voltage Range
Power supply voltage range and analog switch voltage range
2、On-Resistance
Resistance inserted into the signal path after the switch path is closed
3、Bandwidth
Frequence range of signals that can pass through a switch with attenuation not exceeding 3dB
4、Isolation & Crosstalk
Off-State Isolation(OISO): measurement of the impedance of a switch when it is in the off state
Channel-to-Channel Crosstalk(XTALK): a measure of the unwanted signal coupling from the conducting channel to the off channel
5、Eye Diagram
A graphical representation formed by the accumulated series of digital signals on an oscilloscope can be used to observe the effects of intersymbol interference and noise
Figure 3: Eye Diagram Test Setup
Figure 4: Product Test Results
