Digitally controlled phase shifter
AssigneeQUALCOMM Incorporated
InventorsDanial Ehyaie, Muhammad Adnan
Life of this patent
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Abstract
A digitally controlled phase shifter is disclosed. In an exemplary embodiment, an apparatus includes a first component connected between a first terminal and a node, a second component connected between a second terminal and the node, an impedance selectively connected between the first and second terminals by a first switch, and a second switch to connected between the node and a ground. The apparatus is configured to provide a first amount of phase shift when the first and second switches are in an open position, and a second amount of phase shift when the first and second switches are in a closed position.
Claims14
An apparatus comprising:
- a first component connected between a first terminal and a node;
- a second component connected between a second terminal and the node;
- a third impedance connected between the first terminal and the second terminal;
- means for selectably disconnecting the third impedance from the second terminal, the means for selectively disconnecting the third impedance being coupled in series with the third impedance;
- and
- means for selectably connecting the node to a ground, the means for selectably disconnecting and connecting configured to enable selected amounts of phase shifts to signals flowing between the first and second terminals,
- wherein a first group delay of the selected amounts of phased shifts, measured when the third impedance is disconnected from the second terminal and the node is disconnected from the ground is substantially equal to a second group delay of the selected amounts of phased shifts, measured when the third impedance is connected to the second terminal and the node is connected to the ground.
An apparatus comprising:
- a first component connected between a first terminal and a node;
- a second component connected between a second terminal and the node;
- a third impedance selectively connected between the first and second terminals by a first switch coupled in series with the third impedance, wherein the third impedance comprises a capacitor;
- a second switch connected between the node and a ground, the first and second switches configured to enable selected amounts of phase shifts to signals flowing between the first and second terminals;
- and
- wherein the first and second components comprising first and second transmission lines, respectively.
An apparatus comprising:
- a first component connected between a first terminal and a node;
- a second component connected between a second terminal and the node;
- a third impedance selectively connected between the first and second terminals by a first switch coupled in series with the third impedance;
- and
- a second switch connected between the node and a ground, the first and second switches configured to enable selected amounts of phase shifts to signals flowing between the first and second terminals,
- wherein a first group delay of the selected amounts of phased shifts, measured when the first and second switches are open is substantially equal to a second group delay of the selected amounts of phased shifts, measured when the first and second switches are closed.
Dependencies are inferred from the claim text.