High-Voltage Multiplexers/Demultiplexers and Switches for Ultrasound
High-voltage switches are specialized electronic components that are essential for managing and controlling high-voltage signals in ultrasound imaging and therapy systems. These switches control the high-voltage pulses required to excite piezoelectric transducers, which convert electrical energy into mechanical energy to produce ultrasound waves. In medical imaging, they enable the creation of detailed images of internal structures by controlling the activation of the piezoelectric elements.
Multiplexers are devices that can route multiple input signals to a single output line, or vice versa, enabling efficient signal management and reducing wiring complexity. In high-voltage applications, multiplexers must be robust and capable of isolating and switching between high-voltage signals without degradation or interference. Together, these components are essential for the reliability and functionality of systems that require precise control and distribution of high-voltage electricity.
Differences Between Multiplexers and Switches
Multiplexers (MUXs)/Demultiplexers (DEMUXs)
High-voltage multiplexers and demultiplexers are critical components in electronic circuits, each serving distinct functions and possessing unique characteristics. MUXs are devices that select one of several input signals and forward the chosen input to a single output line, enabling multiple signals to share a single device or resource, such as an Analog-to-Digital Converter (ADC). Conversely, a DEMUX is a circuit with one input and multiple outputs, used to direct a signal to one of many devices.
These components are commonly utilized in data acquisition systems, communication systems and signal routing applications. High-voltage multiplexers and demultiplexers are specifically designed to handle higher voltage levels than standard multiplexers, making them suitable for applications involving elevated input voltages, such as industrial control systems or medical equipment.
Switches
Switches can open or close an electrical circuit to allow or prevent the flow of current. High-voltage switches are specifically designed to handle higher voltage levels safely and are used in power distribution, load management and protection circuits. These switches ensure safe operation and isolation in applications such as power electronics and high-voltage testing, where precise control of high voltage is required. While standard switches focus primarily on the basic function of opening and closing circuits, high-voltage switches manage the complexities and safety requirements associated with high voltage levels. Switches can be configured as MUX/DEMUX function by connecting the input or the output pins.
Our high-voltage switches are 64-channel, integrated high-voltage analog switches that operate using a single +5V-bias supply. These switches can pass pulsed signals up to ±100V, which makes them suitable for applications that require high-voltage switching controlled by low-voltage signals.
HV2825
The HV2825 does not require a bleed resistor on either side of the switch, which enhances its versatility and ease of use.
HV2925
The HV2925 features two bleed resistors on both sides of the switches for optimal performance.
HV2926
The HV2926 includes a bleed resistor on the switch terminal side to facilitate smooth operation.
Medical Imaging
In diagnostic ultrasound imaging, high-voltage MUXs are used to route high-voltage pulses to different transducers in an array. This allows for the sequential activation of transducers, enabling the creation of detailed images of internal structures, such as organs, tissues and blood flow.
Therapeutic Ultrasound
In therapeutic applications, such as HIFU or lithotripsy, high-voltage MUXs control the delivery of high-voltage pulses to specific transducers or groups of transducers. This enables the precise targeting of ultrasound energy to treat specific tissues, such as ablating tumors or breaking up kidney stones.
Industrial and Research Applications
High-voltage MUXs are also used in non-medical ultrasound applications, such as NDT and research. In these applications, MUXs route high-voltage pulses to different transducers to inspect materials for defects or to study the properties of various substances.