Back to results
US 6,611,174 B1Granted
Self-compensated transimpedance amplifier
OwnerAdam J. Shermaninventor
Life of this patent
Estimating the term…
Abstract
A method to increase the bandwidth of a transimpedance amplifier using capactive feedback. The resultant amplifier maintains wide bandwidth, high linearity, low noise, and low input impedance independent of component variations. These characteristics greatly facilitate the economical measurement of small currents such as those arising from photodiodes and biological preparations.
Claims12
A machine for increasing or decreasing the bandwidth of a transimpedance amplifier comprising:
- a) a transimpedance amplifier having a transimpedance bandwidth, a transimpedance input, and a transimpedance output, said transimpedance input having a low input impedance, and
- b) a capacitive feedback means which takes as input said transimpedance output and generates a compensation current which supplies a feedback of either positive or negative polarity to said transimpedance amplifier at said transimpedance input,
- wherein said transimpedance bandwidth of said transimpedance amplifier is increased when said feedback is positive and decreased when said feedback is negative.
A method for increasing or decreasing the bandwidth of a transimpedance amplifier comprising:
- a) providing a transimpedance amplifier having a transimpedance bandwith a transimpedance input, and a transimpedance output, said transimpedance input having a low input impedance, and
- b) providing a capacitive feedback means which takes as input said transimpedance output and generates a compensation current which supplies a feedback of either positive or negative polarity to said transimpedance amplifier at said transimpedance input,
- wherein said transimpedance bandwidth of said transimpedance amplifier is increased when said feedback is positive and decreased when said feedback is negative.
Dependencies are inferred from the claim text.