Amplifier circuits with guarding for mitigation of dielectric absorption
AssigneeAvago Technologies International Sales Pte. Limited
InventorRishi Chandra Agarwal
Life of this patent
Estimating the term…
Abstract
Amplifier circuits that can provide improved performance by mitigating the effects of dielectric absorption. An example integrated circuit includes a first pin connectable to a photodiode to receive an input current from the photodiode; a second pin connectable to a capacitor; an amplifier comprising an inverting input terminal and an output terminal; a guard buffer connected between the second pin and the inverting input terminal of the amplifier; and a third pin connected to the output terminal of the amplifier to provide an output voltage indicative of the input current.
Claims20
An integrated circuit, comprising:
- a first pin connectable to a first photodiode to receive a first input current from the first photodiode;
- a first amplifier comprising an inverting input terminal and an output terminal;
- a second pin connectable to a second photodiode to receive a second input current from the second photodiode;
- a second amplifier comprising an inverting input terminal and an output terminal;
- a third pin connectable to a capacitor;
- a guard buffer connected between the third pin and the inverting input terminal of the first amplifier and between the third pin and the inverting input terminal of the second amplifier;
- a precharge buffer connected to the first pin, the second pin, and the guard buffer;
- a fourth pin connected to the output terminal of the first amplifier to provide a first output voltage indicative of the first input current;
- and
- a fifth pin connected to the output terminal of the second amplifier to provide a second output voltage indicative of the second input current.
An integrated circuit, comprising:
- a first pin connectable to a photodiode to receive an input current from the photodiode;
- a second pin connectable to a capacitor;
- an amplifier comprising an inverting input terminal and an output terminal;
- a filter connected between the first pin and the inverting input terminal of the amplifier;
- a guard buffer connected between the second pin and the inverting input terminal of the amplifier;
- and
- a third pin connected to the output terminal of the amplifier to provide an output voltage indicative of the input current.
An integrated circuit, comprising:
- a first pin connectable to a photodiode to receive an input current from the photodiode;
- a second pin connectable to a capacitor;
- an amplifier comprising an inverting input terminal and an output terminal;
- a guard buffer connected between the second pin and the inverting input terminal of the amplifier;
- and
- a third pin connected to the output terminal of the amplifier to provide an output voltage indicative of the input current.
Dependencies are inferred from the claim text.