Signal attenuation circuit
US4646036A · kind A · utility
16Cited by
6References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 23, 1985 |
| Grant date | Feb 24, 1987 |
| Priority date | — |
| Expiry date | Dec 23, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/24
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit which attenuates an RF signal in response to a voltage level of a control signal is disclosed. A first PIN diode resides in series with an RF signal path, and a second PIN diode shunts the RF signal path to ground. A first differential amplifier responsive to the control signal drives the first PIN diode, and a second differential amplifier responsive to the control signal drives the second PIN diode. Gain and maximum current output for each of the amplifiers are independently controlled. Additionally, separate reference voltage sources may apply to one input of each of the differential amplifiers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.