Double balanced mixer
US6275688A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1999 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | Feb 19, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D2200/0084
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A double balanced mixer which may be used in communications devices, such as portable or cellular telephones. The mixer includes a first differential amplifier having a first transistor pair whose emitters are connected together, a second differential amplifier having a second transistor pair whose emitters are connected together, and a third differential amplifier having a third transistor pair whose emitters are connected together by way of a resistor. A first constant current source is connected between the emitter of one of the transistors of the third transistor pair and ground. A second constant current source is connected between the emitter of the other transistor of the third transistor pair and ground. A gate circuit is connected to one of the first and second current sources for selectively activating the one connected current source. By selectively activating the current source, the mixer has low power consumption.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.