Collector-injection mixer with radio frequency signal applied to collectors of lower transistor pair
US5521545A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 1994 |
| Grant date | May 28, 1996 |
| Priority date | — |
| Expiry date | Oct 21, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D2200/0088
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A collector-injector mixer circuit (100) has a first differential pair of transistors having first and second transistors (102, 104) whose emitters are connected to a common first emitter terminal (110), and a second differential pair of transistors having third and fourth transistors (106, 108) whose emitters are connected to a common second emitter terminal (112). The bases of the first and fourth transistors (102, 108) are coupled to a common first base terminal (114) and the bases of the second and third transistors (104, 106) are coupled to a common second base terminal (116) between which a mixing signal is applied. A third differential pair of transistors have fifth and sixth transistors (124, 126) wherein collector (130, 132) of the fifth transistor (124) and sixth transistor (126) receive an input signal, an emitter of the fifth and sixth transistors (124, 126) are coupled through resistors (146, 148) to ground, and bases of the fifth and sixth transistors are coupled to a reference current circuit (150).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.