What kind of semiconductor is used in an analog switch IC?
The basic analog switch IC using either MOS, CMOS, FET or JFET semiconductors, is shown in figure 1 and figure 2. When the logic control signal is “high,” logic 1, a positive voltage is applied through amplifier (1) to the gate of the N-type transistor. Inverting amplifier (2) applies a negative voltage to a gate of the P-type device.
What’s the maximum voltage for an analog switch?
The high-voltage pulses going through the analog switch must be within 10V of the high-voltage supplies. For ±100V supplies, the maximum transmit voltage is ±90V. Additional circuits are needed to generate these two high-voltage supplies, as they are not needed elsewhere in the system.
How much high voltage does an IC need?
Conventional high-voltage analog switch ICs require two high-voltage power supplies, +100V and -100V, for proper operation. The high-voltage pulses going through the analog switch must be within 10V of the high-voltage supplies. For ±100V supplies, the maximum transmit voltage is ±90V.
How does analog switch logic affect supply current?
The relationship between analog-switch input logic levels and their effect on supply current is often misunderstood. If the logic inputs are at ground or V CC (or V L, when available), analog switches have essentially no supply current.
How is an analog switch like a solid state relay?
An analog switch acts like a solid-state relay (i.e., with no moving parts). Analog switches can also isolate devices at their terminals when the analog switch is OFF. When ON, they conduct both analog and digital signals, regardless of the direction in which the signal is traveling.
What does it mean when an analog switch is closed?
Analog voltage range: The maximum un-distorted voltage that can be passed between the input and output terminals when the switch is closed. Analog current range: The maximum un-distorted current that can pass between the input and output terminals. “On” resistance: The resistance between the input and output terminals when the switch is closed.
What is the range of an analog switch?
General purpose and special feature switches are described in the following articles. Analog voltage range: The maximum un-distorted voltage that can be passed between the input and output terminals when the switch is closed. Analog current range: The maximum un-distorted current that can pass between the input and output terminals.