Gain invariant bidirectional phase shifter
AssigneeTexas Instruments Incorporated
InventorsTolga Dinc, Swaminathan Sankaran
Life of this patent
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Abstract
A bidirectional phase shifter includes a differential quadrature hybrid coupler, a switch network, and a differential reflection type phase shifter (RTPS). The differential quadrature hybrid coupler includes a first phase input/output (I/O) port, an inverse first phase I/O port, a second phase I/O port, and an inverse second phase I/O port. The switch network is coupled to the first phase I/O port, the inverse first phase I/O port, the second phase I/O port, and the inverse second phase I/O port. The differential RTPS including a differential I/O port coupled to the switch network.
Claims16
An apparatus comprising:
- a coupler including a first port, a second port, and a third port, in which the second port and the third port have a 90-degree phase shift from each other:
- a phase shifter having a phase control terminal and a variable resistance circuit coupled to the phase control terminal;
- and
- a switch network coupled between the second and third ports and the phase shifter.
Dependencies are inferred from the claim text.