Transimpedance pre-amplifier and a receiver including the pre-amplifier
US5257285A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 8, 1989 |
| Grant date | Oct 26, 1993 |
| Priority date | — |
| Expiry date | Aug 8, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/6931
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A transimpedance pre-amplifier circuit is arranged to have a complex pole response resulting from the interaction of the open-loop pole with the pole associated with a circuit feedback. The pre-amplifier circuit includes a transistor with a load capacitor connected in the transistor output circuit to determine the open-loop pole. The feedback includes a resistive element. The first stage of the pre-amplifier comprising the transistor may be followed by one or more further amplifying stages. The feedback to the input of the first stage may be from the output of one of the further stages. A receiver incorporating the pre-amplifier circuit includes only post-amplifiers connected to receive the output of the pre-amplifier. The response of the pre-amplifier makes it unnecessary to include a dedicated passive filter in the receiver and the post-amplifiers can have smaller bandwidths than in conventional receivers. This makes the receiver particularly useful for use at high frequencies, for example, of the order of 1.6 GHz.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.