Back to results
US 2003/0179022 A1Published application
Modulated current source difference mode emitter follower driver circuit
OwnerRobert Martininventor
Life of this patent
Estimating the term…
Abstract
A driver circuit comprising has a pair of inputs, a pair of outputs, and multiple transistors, connected in a differential configuration, comprising a first set of transistors configured as a current mirror current source stage, a second set of transistors configured as a current source stage, and a third set of transistors configured as an emitter follower stage.
Claims19
A driver circuit comprising:
- multiple transistors connected in a differential configuration;
- a first set of transistors, selected from among the multiple transistors, configured as a current mirror current source stage;
- a second set of transistors, selected from among the multiple transistors, configured as a current source stage;
- a third set of transistors, selected from among the multiple transistors, configured as an emitter follower stage;
- the first, second and third sets of transistors being connected to each other such that
- a) two transistors in the third set are both connected to a common transistor in the second set,
- b) one of the two transistors in the third set that is connected to the common transistor in the second set is also connected to a transistor in the first set, and
- c) a first resistor is connected in parallel between the first and second sets;
- a pair of inputs, each of the inputs in the pair of inputs being connected to different transistors in the third set;
- and
- a pair of outputs, each of the outputs being taken across opposite sides of a second resistor connected in parallel with transistors from both the second and third sets.
8 more elements
The driver circuit of claim 4, wherein each emitter of the transistors in the first set of transistors is connected to ground.
A driver circuit comprising:
- multiple transistors each having an emitter, a base and a collector, wherein a DC voltage source is connected to the respective collectors of a first, second, third, and fourth transistor of the multiple transistors;
- the first and third transistor bases being connected to a first end of a first resistor, a second end of the resistor being connected to a negative input;
- the second and fourth transistor bases being connected to a first end of a second resistor, a second end of the second resistor being connected to a positive input;
- the emitter of the first transistor being connected to the base of a fifth transistor and the collector of a sixth transistor;
- the emitter of the second transistor being connected to the collector of the fifth transistor and to a first end of a group of at least three resistors connected in series;
- the emitter of the third transistor being connected to the collector of a seventh transistor and to a second end of the group of at least three resistors;
- the emitter of the fourth transistor being connected to the base of the seventh transistor and the collector of an eighth transistor;
- the emitter of the fifth transistor being connected to the collector of a ninth transistor and a resistor being connected to the emitter of the seventh transistor,
- the emitter of the seventh transistor being connected to the collector of a tenth transistor;
- the bases of each o f the sixth, eight, ninth and tenth transistors all being connected to each other;
- the emitters of the sixth, eight, ninth, and tenth transistors all being connected to ground;
- and
- an output taken across a resistor within the group of at least three resistors.
10 more elements
Dependencies are inferred from the claim text.