Amplitude variable pulse generating circuit
US5138187A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 1989 |
| Grant date | Aug 11, 1992 |
| Priority date | — |
| Expiry date | Jul 20, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB06B1/0215
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An amplitude variable pulse generator is provided with two voltage supply sources. The first voltage source supplies a variable voltage which determines the amplitude of the output pulse. The second voltage source is a fixed or constant voltage source which provides a voltage lower in value than the first voltage. The second voltage source quickly pulls up a voltage between a drain and a source of a switching MOSFET, which generates the output pulse, by providing a charging voltage for an output capacitance of the MOSFET. By doing so, the output capacitance of the MOSFET is quickly reduced, and the trailing edge of the output pulse is not rounded even when the variable voltage is low. As a result, the waveform of the output pulse is not rounded for a very small amplitude pulse. Resolution of a supersonic wave device especially a supersonic diagnostic device is thereby improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.