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US 7,403,065 B1Granted
Differential transimpedance amplifier circuit for correlated differential amplification
AssigneesSandia Corporation, Arizona Board of Regents
InventorsChristopher A. Gresham, M. Bonner Denton, Roger P. Sperline
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Abstract
A differential transimpedance amplifier circuit for correlated differential amplification. The amplifier circuit increase electronic signal-to-noise ratios in charge detection circuits designed for the detection of very small quantities of electrical charge and/or very weak electromagnetic waves. A differential, integrating capacitive transimpedance amplifier integrated circuit comprising capacitor feedback loops performs time-correlated subtraction of noise.
Claims18
A capacitive differential transimpedance amplifier circuit, comprising:
- a differential output amplifier, the differential output amplifier having a pair of inputs and a pair of outputs, the pair of inputs comprising a first inverting input and a first non-inverting input, and the pair of outputs comprising a first inverting output and a first non-inverting output;
- a pair of detection elements;
- a first input node, the first input node being connected to the first inverting input, wherein a first input signal from a first detection element of the pair of detection elements is direct-current-coupled through the first input node to the first inverting input;
- a second input node, the second input node being connected to the first non-inverting input, wherein a second input signal from a second detection element of the pair of detection elements is direct-current-coupled through the second input node to the first non-inverting input;
- an inverting-input feedback capacitor connected between the first inverting input and the first non-inverting output;
- a non-inverting-input feedback capacitor connected between the first non-inverting input and the first inverting output;
- an inverting-input reset switch means connected in parallel with the inverting-input feedback capacitor between the first inverting input and the first non-inverting output;
- and
- a non-inverting-input reset switch means connected in parallel with the non-inverting-input feedback capacitor between the first non-inverting input and the first inverting output.
6 more elements
Dependencies are inferred from the claim text.