Differential transconductance circuit
US4951003A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 1989 |
| Grant date | Aug 21, 1990 |
| Priority date | — |
| Expiry date | May 16, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/3211
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A amplifier circuit comprises first transistor (T.sub.1) and a second transistor (T.sub.2) whose emitters are each connected via a first resistors (R.sub.1) to a point (2) which is connected to the power-supply terminal (3) by means of a current source (1). The bases of said transistors are connected to input terminals (4,5) and via a second resistor (R.sub.2) each to the base of a third transistor (T.sub.3) whose emitter is connected to the terminal (2). The linearity of the circuit is improved by arranging a fourth transistor (T.sub.4) and a fifth transistor (T.sub.5) in series with the collector-emitter paths of the first transistor (T.sub.1) and the second transistor (T.sub.2) which fourth and fifth transistor have their bases connected to a reference terminal (7) and have their emitters interconnected by means of a third resistor (R.sub.3).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.