Supporting wideband inputs on RF receivers
AssigneepSemi Corporation
InventorsParvez Daruwalla, Rong Jiang, Sung Kyu Han, Khushali Shah
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Abstract
Methods and devices to support multiple frequency bands in radio frequency (RF) circuits are shown. The described methods and devices are based on adjusting the effective width of a transistor in such circuits by selectively disposing matching transistors in parallel with the transistor. The presented devices and methods can be used in RF circuits including low noise amplifiers (LNAs), RF receiver front-ends or any other RF circuits where input matching to wideband inputs is required.
Claims19
A radio frequency (RF) circuit comprising:
- a transistor;
- an input terminal coupled to a gate terminal of the transistor;
- an output terminal coupled to a drain terminal of the transistor;
- one or more additional transistors, each having:
- a gate terminal configured to selectively couple to and decouple from the input terminal;
- a drain terminal and a source terminal, wherein either the drain terminal is configured to selectively connect to and disconnect from the drain terminal of the transistor and the source terminal is connected to the source terminal of the transistor, or the source terminal is configured to selectively connect to and disconnect from the source terminal of the transistor and the drain terminal is connected to the drain terminal of the transistor, or the drain terminal and the source terminal are configured to selectively connect to and disconnect from the drain terminal and source terminal of the transistor, respectively.
A method of supporting multiple input frequency bands in a radio frequency (RF) circuit comprising a transistor, the method comprising:
- arranging the transistor in a common-source configuration;
- coupling a gate terminal of the transistor to an input terminal where an input signal is applied;
- providing one or more additional transistors;
- selectively coupling a gate terminal of each additional transistor of the one or more additional transistors to the input terminal;
- selectively connecting a drain terminal of the each additional transistor to a drain terminal of the transistor;
- connecting a source terminal of the each additional transistor to a source terminal of the transistor;
- and
- based on a selected frequency band, switching in and out the each additional transistor.
Dependencies are inferred from the claim text.