Communication apparatus with isolation of the receive chain
AssigneeST Microelectronics SA
InventorLaurent Chabert
Life of this patent
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Abstract
A communication apparatus includes an antenna and a receive chain. The receive chain includes a switching transistor, and amplification transistor and a discharge transistor. The amplification transistor has a control terminal coupled to a current path terminal of the switching transistor. The discharge transistor has a current path coupled between the control terminal of the amplification transistor and a ground terminal. The discharge circuit is configured to discharge an intrinsic capacitance of the switching circuit when the switching transistor is in an off state.
Claims22
A communication apparatus comprising:
- an antenna;
- and
- a receive chain comprising an amplifier device and a controllable switching circuit coupled between an input of the amplifier device and the antenna;
- wherein the controllable switching circuit has an intrinsic capacitance;
- wherein the controllable switching circuit has an off state and an on state;
- wherein the amplifier device comprises an inductive element and a discharge circuit, the inductive element coupled between the switching circuit and the discharge circuit;
- and
- wherein the discharge circuit of the amplifier device is coupled to the switching circuit to discharge the intrinsic capacitance of the switching circuit in the off state.
A communication apparatus comprising a receive chain, the receive chain comprising:
- an antenna node;
- an impedance-matching inductive element;
- a switching transistor having a current path coupled between the antenna node and a first terminal of the impedance-matching inductive element;
- a discharge transistor coupled between a second terminal of the impedance-matching inductive element and a ground terminal;
- an amplification transistor coupled to the second terminal of the impedance-matching inductive element, the amplification transistor having a current path between a first transistor terminal and a second transistor terminal;
- a resistive element coupled between the first transistor terminal of the amplification transistor and a reference supply terminal;
- and
- a degeneration inductive element coupled between the second transistor terminal of the amplification transistor and the ground terminal.
A receive chain of a communication device, the receive chain comprising:
- a switching transistor
- an amplification transistor having a control terminal coupled to a current path terminal of the switching transistor;
- and
- a discharge transistor having a current path coupled between the control terminal of the amplification transistor and a ground terminal, wherein the discharge transistor is configured to discharge an intrinsic capacitance of the switching transistor when the switching transistor is in an off state.
Dependencies are inferred from the claim text.