Charge pump amplifier
First Claim
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1. A charge pump amplifier comprising:
- an operational amplifier having an input and an output;
feedback means connected between the input and the output of the operational amplifier and comprising a storage means;
means selectively coupled to the input of the operational amplifier and to a voltage source, for storing a charge from the voltage source, and for transferring the stored charge to the input of the operational amplifier;
means for selectively discharging the storage means at a rate different than the rate at which the stored charges are applied to input of the operational amplifier;
whereby a plurality of charges from the means for storing a charge are transferred to the storage means, and the plurality of the charges are accumulated by the storage means prior to the discharge thereof.
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Abstract
A charge pump amplifier useful for providing precise gain in integrated circuits is described. The amplifier uses an operational amplifier with a capacitive feedback to accumulate successive charges applied to the input of the operational amplifier by a switched-capacitor input. If the capacitors are of equal size, the gain of the amplifier is a function of the ratio of the frequency of the switched capacitor input and the frequency of discharge of the feedback capacitor.
12 Citations
5 Claims
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1. A charge pump amplifier comprising:
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an operational amplifier having an input and an output; feedback means connected between the input and the output of the operational amplifier and comprising a storage means; means selectively coupled to the input of the operational amplifier and to a voltage source, for storing a charge from the voltage source, and for transferring the stored charge to the input of the operational amplifier; means for selectively discharging the storage means at a rate different than the rate at which the stored charges are applied to input of the operational amplifier; whereby a plurality of charges from the means for storing a charge are transferred to the storage means, and the plurality of the charges are accumulated by the storage means prior to the discharge thereof. - View Dependent Claims (2, 3, 4, 5)
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Specification