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US 2001/0011922 A1Published application
Electronic circuit
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorAlan Dawes
Life of this patent
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Abstract
A switched capacitor amplifier circuit is provided with two independent reference voltages, one which provides an appropriate bias level for the amplifiers, and one which sets a common mode input level for the amplifiers, thereby allowing the dynamic range to be maximised.
Claims3
A switched capacitor amplifier circuit, comprising:
- a plurality of cascaded differential amplifiers, each having respective differential input terminals and respective differential output terminals;
- a first capacitor connected between the positive output terminal of each amplifier and the positive input terminal of a succeeding amplifier;
- a second capacitor connected between the negative output terminal of each amplifier and the negative input terminal of a succeeding amplifier;
- a switching circuit connected to switch the first and second capacitors alternately between a first voltage reference and the input terminals of a succeeding amplifier and between the output terminals of a preceding amplifier and a second voltage reference;
- the second voltage reference being independent of the first voltage reference.
2 more elements
Dependencies are inferred from the claim text.