Switched-capacitor DC blocking amplifier
AssigneeQUALCOMM Incorporated
InventorsPeter J Shah, Shahin Mehdizad Taleie, Gerrit Groenewold, Guoqing Miao, Eunyung Sung
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Abstract
A switched-capacitor DC blocking amplifier is disclosed. In an embodiment, an integrated circuit is provided that includes an amplifier having an amplifier input and an amplifier output, a capacitor connected to the amplifier input and configured to receive an input signal, and a switched capacitor circuit coupled to provide a resistance between the amplifier input and the amplifier output. In one implementation, the switched capacitor circuit is configured with a feed forward circuit to reduce aliasing. In another implementation, the switched capacitor circuit includes a switched impedance circuit to reduce noise.
Claims19
An apparatus comprising:
- an integrated circuit comprising:
- an amplifier having an amplifier input and an amplifier output;
- a capacitor connected to the amplifier input and configured to receive an input signal;
- and
- a switched capacitor circuit comprising:
- a switching capacitor having first and second terminals coupled to a plurality of switches, wherein the plurality of switches are configured to couple the first and second terminals of the switching capacitor to:
- the amplifier input and a first bias voltage, respectively, during a first phase;
- and
- a second bias voltage and the amplifier output, respectively, during a second phase non-overlapping with the first phase.
An apparatus comprising:
- means for amplifying provided on an integrated circuit and comprising an amplifier input and an amplifier output;
- means for capacitive coupling provided on an integrated circuit to couple an input signal to the amplifier input;
- and
- means for providing a switched capacitor circuit on the integrated circuit to provide a resistance between the amplifier input and the amplifier output, the means for providing a switched capacitor circuit comprising means for selectively coupling first and second terminals of a switching capacitor to the amplifier input and a first bias voltage, respectively, during a first phase, and for selectively coupling the first and second terminals to a second bias voltage and the amplifier output, respectively, during a second phase.
Dependencies are inferred from the claim text.