Integrating coupling circuit for coupling a modulator to a ceramic filter, useful with amplitude modulation receivers
US4910801A · kind A · utility
8Cited by
2References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1987 |
| Grant date | Mar 20, 1990 |
| Priority date | — |
| Expiry date | Dec 30, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D2200/0088
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An integrated coupling circuit for coupling a modulator to a ceramic filter in amplitude modulation receivers, which modulator includes an output stage comprising a pair of differential cells parallel-connected to each other. The coupling circuit comprises a pair of transistors connected to each other through their respective bases and forming a bridge circuit with a diode and third transistor. Each transistor in the pair is connected in a cascode configuration and powered from a respective current mirror circuit connected to an output terminal of the modulator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.