Differential amplifier system
US4667166A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 17, 1986 |
| Grant date | May 19, 1987 |
| Priority date | — |
| Expiry date | Jan 17, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/45103
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A differential amplifier system comprising a pair of transistors having their collectors connected respectively to a pair of system output terminals, their bases connected respectively to a pair of system input terminals via a pair of capacitors, and their emitters interconnected via a resistor. Also included are a pair of differential amplifiers each having a first input connected to one input terminal, a second input connected to the emitter of one transistor, and an output connected to the base of one transistor. The pair of differential amplifiers are effective to cause, in their operating range of frequencies, negative feedback such that the emitter voltages of the pair of transistors become equal to the input signal voltages. Higher frequencies are directed to the bases of the transistors via the capacitors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.