Auto-zero amplifier circuit with wide dynamic range

H - Electricity – 03 – F

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330/10

H03F 1/00 (2006.01) H03F 1/02 (2006.01) H03F 1/30 (2006.01)

Patent

CA 1144244

AUTO-ZERO AMPLIFIER CIRCUIT WITH WIDE DYNAMIC RANGE Abstract of the Disclosure An operational amplifier is continuously switched back-and-forth between an auto-zero mode of operation and an accurate amplification mode of operation. During the auto-zero mode of operation, the junction between an offset voltage compensation (e.g., auto-zero) capacitor and the noninverting input of the operational amplifier is referenced to the input signal voltage via a bootstrap amplifier rather than being tied to ground. Further, during the auto-zero mode of operation, the other end of the auto-zero capacitor is referenced to the output of the operational amplifier, which is also connected to the inverting input of theoperational amplifier. As a result, the auto-zero capacitor is charged to a voltage level equal to the input offset voltage of the operational amplifier, but in polarity opposition thereto. During the accurate amplification mode of operation, the input signal is applied to the noninverting input of the operational amplifier via the auto- zero capacitor. As a result, the charge on the auto-zero capacitor cancels the input offset voltage of the amplifier whereby the output of the operational amplifier is accurately related to the voltage of the input signal by the gain of the operational amplifier. Because the auto-zero capacitor is referenced to the input signal voltage during the auto-zero mode of operation, rather than being tied to ground, voltage swings at the output of the operational amplifier and across the various switch elements are kept low. As a result, the auto-zero amplifier circuit is operable over a wide dynamic range.

358049

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