High breakdown voltage/low input capacitance amplifier
AssigneeVTC Inc.
InventorsCraig M. Brannon, John J. Price
Life of this patent
Estimating the term…
Abstract
An amplifier includes first and second transistors each of which has a conduction path, with first and second conduction path terminals, and a control terminal for controlling conduction through the conduction path. The amplifier also includes a current source and voltage reference terminal for being coupled to a voltage reference. A first Schottky diode has an intrinsic series resistance and is coupled between the second conduction path terminal of the first transistor and the current source. A second Schottky diode has an intrinsic series resistance and is coupled between the second conduction path terminal of the second transistor and the current source.
Claims24
An amplifier, comprising:
- first and second transistors, each transistor having a conduction path, with first and second conduction path terminals, and a control terminal for controlling conduction through the conduction path;
- a current source;
- a voltage reference terminal for being coupled to a voltage reference;
- a first Schottky diode coupled between the second conduction path terminal of the first transistor and the current source;
- a second Schottky diode coupled between the second conduction path terminal of the second transistor and the current source;
- a third Schottky diode coupled between the first conduction path terminal of the first transistor and the voltage reference terminal;
- and
- a fourth Schottky diode coupled between the first conduction path terminal of the second transistor and the voltage reference terminal.
The amplifier of claim and further comprising:
- a first resistive element coupled between the first conduction path terminal of the first transistor and the voltage reference terminal;
- and
- a second resistive element coupled between the first conduction path terminal of the second transistor and the voltage reference terminal.
An amplifier for amplifying read signals provided from a read/write head in a magnetic disc drive, the amplifier comprising:
- first and second transistors, each transistor having a conduction path, with first and second conduction path terminals, and a control terminal for controlling conduction through the conduction path, the control terminals being coupled to the read/write head;
- a current source;
- a voltage reference terminal for being coupled to a voltage reference;
- a first Schottky diode having an intrinsic series resistance and being coupled between the second conduction path terminal of the first transistor and the current source;
- a second Schottky diode having an intrinsic series resistance and being coupled between the second conduction path terminal of the second transistor and the current source;
- and
- compensation means for compensating for variation in the intrinsic series resistances of the first and second Schottky diodes to reduce effects of the variation on gain of the amplifier.
An amplifier, comprising:
- a first NPN transistor having a base, an emitter, and a collector;
- a second NPN transistor having a base, an emitter, and a collector;
- a current source;
- a voltage reference terminal for being coupled to a voltage reference;
- a first Schottky diode connected between the emitter of the first transistor and current source;
- a second Schottky diode connected between the emitter of the second transistor and the current source;
- a third Schottky diode connected between the collector of the first transistor and the voltage reference terminal;
- and
- a fourth Schottky diode connected between the collector of the second transistor and the voltage reference terminal.
Dependencies are inferred from the claim text.