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US 12,597,889 B2Granted
Distortion compensation for a switch in an amplifier circuit
AssigneeNXP B.V.
InventorRobert Melis Visser
Life of this patent
Estimating the term…
Abstract
An amplifier circuit that includes a capacitor voltage divider that is selectively enabled with a switch. The circuit includes two capacitor banks where the banks are electrically coupled to opposing side terminals of the switch. When the capacitor voltage divider is not enabled, one bank is adjusted to control the gain of the amplifier. When the capacitor voltage divider is enabled, both banks are used to control the gain of the amplifier.
Claims20
A circuit comprising:
- an input node;
- an input capacitor including a first electrode electrically coupled to the input node;
- an amplifier;
- a first programmable capacitor bank including a first terminal electrically coupled to a second electrode of the input capacitor and a second terminal electrically coupled to an input of the amplifier;
- a switch including a first terminal coupled to the second electrode of the input capacitor and to the first terminal of the first programmable capacitor bank;
- a second programmable capacitor bank including a first terminal electrically coupled to a second terminal of the switch and including a second terminal electrically coupled to the input of the amplifier;
- a divider capacitor including a first electrode electrically coupled to the second terminal of the switch and electrically coupled to the first terminal of the second programmable capacitor bank;
- a controller including an output to control the conductivity of the switch, wherein during a first mode of operation, the switch is open such that there is no conductive path between the first terminal of the switch and the second terminal of the switch through the switch and the input capacitor and the divider capacitor are not configured as a capacitor voltage divider, wherein during the second mode of operation, the switch is closed such that there is a conductive path between the first terminal of the switch and the second terminal of the switch through the switch and the input capacitor and the divider capacitor are configured as a capacitor voltage divider;
- wherein during the first mode of operation, a capacitance provided by the first programmable capacitor bank but not a capacitance provided by the second programmable capacitor bank is adjusted to control a gain of the amplifier, wherein during the second mode of operation, the capacitance provided by the first programmable capacitor bank and the capacitance provided by the second programmable capacitor bank are each adjusted to control the gain of the amplifier.
6 more elements
A method for amplifying a signal comprising:
- in a first mode of operation, providing an input signal from a first node, through an input capacitor, through a first programmable capacitor bank, and to an input of an amplifier, wherein during the first mode of operation, a switch is open such that there is no signal path from the input capacitor to a divider capacitor through the switch, wherein during the first mode of operation, a capacitance of the first programmable capacitor bank is adjusted to control a gain of the amplifier but a capacitance of a second programmable capacitor bank is not adjusted to control the gain of the amplifier;
- in a second mode of operation, the input signal is provided from the first node through the input capacitor where the switch is closed to provide a signal path through the switch from an electrode of the input capacitor to the divider capacitor where the input capacitor and the divider capacitor are configured as a capacitor voltage divider such a signal at a node between the input capacitor and divider capacitor is provided through the first programmable capacitor bank and through the second programmable capacitor bank to the input of the amplifier, wherein during the second mode of operation, the capacitance of the first programmable capacitor bank and the capacitance of the second programmable capacitor bank are adjusted to control the gain of the amplifier.
A circuit comprising:
- a switch including a first terminal and a second terminal;
- an amplifier;
- a first programmable capacitor bank including a first terminal electrically coupled to the first terminal of the switch and including a second terminal electrically coupled to an input of the amplifier;
- a second programmable capacitor bank including a first terminal electrically coupled to the second terminal of the switch and including a second terminal electrically coupled to the input of the amplifier;
- a controller including an output to control the conductivity of the switch, wherein during a first mode of operation, the switch is open such that there is no conductive path between the first terminal of the switch and the second terminal of the switch through the switch, wherein during a second mode of operation, the switch is closed such that there is a conductive path between the first terminal of the switch and the second terminal of the switch through the switch;
- wherein during the first mode of operation, a capacitance provided by the first programmable capacitor bank but not a capacitance provided by the second programmable capacitor bank is adjusted to control a gain of the amplifier, wherein during the second mode of operation, the capacitance provided by the first programmable capacitor bank and the capacitance provided by the second programmable capacitor bank are each adjusted to control the gain of the amplifier.
3 more elements
Dependencies are inferred from the claim text.