Patent ID: 7365597
Filing Date: 2008-04-29
Classification: H03F

Abstract:
1. An amplifier circuit, comprising: a first stage amplifier having an input terminal and an output terminal, the first stage amplifier being configured to operate with positive feedback, the first amplifier comprising: an input capacitor connected between an amplifier input terminal and the input terminal of the first stage amplifier; and a first feedback capacitor connected between the output terminal of the first stage amplifier and a non-inverting input terminal of the first stage amplifier, the first feedback capacitor being operable to provide positive feedback to the first stage amplifier; a second stage amplifier having an input terminal and an output terminal, the input terminal of the second stage amplifier being coupled to the output terminal of the first stage amplifier, the first stage amplifier and the second stage amplifier together forming an inverting amplifier between the output terminal of the second stage amplifier and the input terminal of the first stage amplifier; and a second feedback capacitor connected between the output terminal of the second stage amplifier and the input terminal of the first stage amplifier, the second feedback capacitor being operable to provide negative feedback from the output terminal of the second stage amplifier to the input terminal of the first stage amplifier.