Apparatus and methods for ultrasound transmit switching
US9178507B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 28, 2012 |
| Grant date | Nov 3, 2015 |
| Priority date | — |
| Expiry date | Nov 28, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/6874
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus and methods for ultrasound transmit switching are provided. In certain implementations, a transmit switch includes a bias polarity control circuit, a bias circuit, a first high voltage field effect transistor (HVFET), and a second HVFET. The sources of the first and second HVFETs are connected to one another at a source node, the gates of the first and second HVFETs are connected to one another at a gate node, and the drains of the first and second HVFETs are connected to an input terminal and an output terminal, respectively. The bias circuit and the bias polarity control circuit are each electrically connected between the source node and the gate node. The bias polarity control circuit can turn on or off the HVFETs by controlling a polarity of a bias voltage across the bias circuit, such as by controlling a direction of current flow through the bias circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.