Differential transimpedance amplifier circuit for correlated differential amplification
| DWPI Title: Capacitive differential transimpedance amplifier (CTIA) circuit for detection system used for sensitive detection of e.g. electrons has non-inverting-input reset switch connected in parallel with the non-inverting-input feedback capacitor |
| 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. |
| Use: Capacitive differential transimpedance amplifier (CTIA) circuit for detection system used for sensitive detection of electrons or of either positively or negatively charged ions. Uses include but are not limited to ion-mobility instruments, differential mobility analysis instruments, mass spectrometer instruments, and aerosol particle analysis instruments. |
| Advantage: The CTIA uses time-correlated differential operation to minimize noise due to electromagnetic interference (EMI) and to provide for effective subtraction of time-correlated noise arising from external environmental sources and from the internal operation of the charge-to-voltage converter (CVC) or other parts of a detection system. True correlated noise subtraction is achieved using a differential output amplifier before a high-gain amplifier correlated noise is subtracted at an early stage of charge detection before passing the signal to a high-gain amplifier, preventing the noise from driving the high-gain amplifier to its compliance limits. Enables subtraction of the charge arriving at the signal and reference input channels at a high-input-impedance stage. Enables removal of input noise prior to amplification of the difference signal in a low-impedance amplification stage or stages. |
| Novelty: The circuit has an inverting-input feedback capacitor (5) connected between an inverting input (1) and a non-inverting output (4); a non-inverting-input feedback capacitor (6) connected between a non-inverting input (2) and an inverting output (3); and an inverting-input reset switch (13) connected in parallel with the inverting-input feedback capacitor. A non-inverting-input reset switch (14) is connected in parallel with the non-inverting-input feedback capacitor. |
| Filed: 8/22/2006 |
| Application Number: US2006507838A |
| Tech ID: SD 10086.0 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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