Solid state wideband high impedance voltage converter
US9755496B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 2013 |
| Grant date | Sep 5, 2017 |
| Priority date | — |
| Expiry date | May 21, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A front-end converter circuit may allow devices, e.g. oscilloscopes and digitizers, to receive input signals having a wide range of possible amplitudes while maintaining a high standardized input impedance. The converter may selectively couple, using low-voltage switches, a selected input network of two or more input networks to a virtual ground node, and a selected feedback network of two or more feedback networks to a transconductance stage input. The selected input network and selected feedback network together define a respective input signal amplitude range. The converter may also controllably adjust an AC gain of the converter to match a DC gain of the converter, and selectively couple non-selected input networks to signal ground. Output referred integrated resistor thermal noise may be reduced to a desired value by lowering the value of the transconductance stage coupled across the input of the converter (through an input resistance) and the virtual ground node.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.