Preamplifier, and waveform shaping circuit incorporating same
US5134309A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1990 |
| Grant date | Jul 28, 1992 |
| Priority date | — |
| Expiry date | Jun 7, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/12
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A preamplifier providing adequate boost even to weak and small input currents, and thus achieving favorable gain and signal-to-noise ratio. An input current is converted to a voltage, which is provided to a differential amplification section. A phase-adjusted version of that voltage signal also is provided to the differential amplifier, the differential amplifier thus outputting an amplified signal based on the phase difference between its inputs. The preamplifier may be incorporated on a single chip, using MOS transistors or gallium arsenide techniques. A level clamping device may be provided in the event that the input current exceeds a predetermined value. The inventive preamplifier also may be incorporated advantageously into a waveform shaping circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.