Two-pin TR switch with switched capacitor
First Claim
Patent Images
1. An integrated circuit (IC) device comprising:
- a transmitter stage;
a receiver stage;
two interface pins configured for connection to an antenna; and
a switching component coupled to each of (i) the transmitter stage, (ii) the receiver stage, and (ii) the two interface pins,wherein the switching component comprises a capacitor,wherein the switching component is configured to operate in one of a first configuration and a second configuration,wherein while the switching component operates in the first configuration, the switching component is configured to (i) transmit a transmit signal produced by the transmitter stage to at least one of the two interface pins, (ii) electrically isolate the transmitter stage from the receiver stage, and (iii) couple the capacitor between the transmitter stage and a ground node, andwherein while the switching component operates in the second configuration, the switching component is configured to (i) transmit a receive signal from at least one of the two interface pins to the receiver stage, (ii) electrically isolate the antenna from the transmitter stage, and (iii) refrain from coupling the capacitor between the transmitter stage and the ground node.
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Accused Products
Abstract
A two-pin transmit/receive switch design includes a switching component configured to selectively switch in elements for a transmit signal path and elements for a receive signal path. A capacitor in the transmit signal path may be switched out when receiving signals on the receive signal path. Being able to selectively switch out the capacitor allows the capacitor value to be selected for optimal operation during transmit mode. For example, insertion loss may be minimized. In addition, elements in the receive signal path may be optimized (e.g., impedance matching) without being affected by or affecting the optimization that was performed for the transmit signal path.
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Citations
14 Claims
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1. An integrated circuit (IC) device comprising:
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a transmitter stage; a receiver stage; two interface pins configured for connection to an antenna; and a switching component coupled to each of (i) the transmitter stage, (ii) the receiver stage, and (ii) the two interface pins, wherein the switching component comprises a capacitor, wherein the switching component is configured to operate in one of a first configuration and a second configuration, wherein while the switching component operates in the first configuration, the switching component is configured to (i) transmit a transmit signal produced by the transmitter stage to at least one of the two interface pins, (ii) electrically isolate the transmitter stage from the receiver stage, and (iii) couple the capacitor between the transmitter stage and a ground node, and wherein while the switching component operates in the second configuration, the switching component is configured to (i) transmit a receive signal from at least one of the two interface pins to the receiver stage, (ii) electrically isolate the antenna from the transmitter stage, and (iii) refrain from coupling the capacitor between the transmitter stage and the ground node. - View Dependent Claims (2, 3)
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4. An integrated circuit (IC) device comprising:
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a transmitter stage; a receiver stage; two interface pins configured for connection to an antenna; and a switching component coupled to each of (i) the transmitter stage, (ii) the receiver stage, and (ii) the two interface pins, wherein the switching component is configured to operate in one of a first configuration and a second configuration, wherein while the switching component operates in the first configuration, the switching component is configured to (i) transmit a transmit signal produced by the transmitter stage to at least one of the two interface pins, and (ii) electrically isolate the transmitter stage from the receiver stage, wherein while the switching component operates in the second configuration, the switching component is configured to (i) transmit a receive signal from at least one of the two interface pins to the receiver stage, and (ii) electrically isolate the antenna from the transmitter stage, wherein the switching component comprises a plurality of switches, wherein all of the plurality of switches are in a closed state while the switching component operates in the first configuration, and wherein all of the plurality of switches are in an open state while the switching component operates in the second configuration.
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5. An integrated circuit (IC) device comprising:
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a transmitter stage; a receiver stage; two interface pins configured for connection to an antenna; and a switching component coupled to each of (i) the transmitter stage, (ii) the receiver stage, and (ii) the two interface pins, wherein the switching component is configured to operate in one of a first configuration and a second configuration, wherein while the switching component operates in the first configuration, the switching component is configured to (i) transmit a transmit signal produced by the transmitter stage to at least one of the two interface pins, and (ii) electrically isolate the transmitter stage from the receiver stage, wherein while the switching component operates in the second configuration, the switching component is configured to (i) transmit a receive signal from at least one of the two interface pins to the receiver stage, and (ii) electrically isolate the antenna from the transmitter stage, wherein the switching component comprises an on-chip capacitor, and wherein the value of the on-chip capacitor is determined based only on an off-chip inductor connected across two terminals of the IC device. - View Dependent Claims (6, 7)
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8. A circuit comprising:
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a transmitter stage; a receiver stage; a switching component coupled to the transmitter stage and the receiver stage, the switching component having a first configuration comprising a transmit circuit that couples a transmit signal produced by the transmitter stage to an antenna assembly connected to the circuit, the switching component having a second configuration comprising a receive circuit that couples a receive signal at the antenna assembly to the receiver stage, wherein, when the switching component is in the first configuration, a signal produced by the transmitter stage of the IC device is electrically isolated from elements of the receive circuit, wherein, when the switching component is in the second configuration, a signal received by the antenna is electrically isolated from elements of the transmit circuit, wherein the switching component comprises a plurality of switches, wherein all of the switches are in a closed state in the first configuration, and wherein all of the switches are in an open state in the second configuration. - View Dependent Claims (9, 10)
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11. A method of operating an integrated circuit device, wherein the integrated circuit device comprises (i) a transmitter stage, (ii) a receiver stage, (iii) two interface pins configured for connection to an antenna, and (iv) a switching component, wherein the switching component comprises a capacitor, and wherein the method comprises:
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operating the switching component in one of a first configuration and a second configuration; while operating the switching component in the first configuration, transmitting, by the switching component, a transmit signal from the transmitter stage to at least one of the two interface pins, electrically isolating, by the switching component, the transmitter stage from the receiver stage, and coupling the capacitor between the transmitter stage and a ground node; and while operating the switching component in the first configuration, transmitting, by the switching component, a receive signal from at least one of the two interface pins to the receiver stage to the receiver stage, electrically isolating, by the switching component, the antenna from the transmitter stage, and refraining from coupling the capacitor between the transmitter stage and the ground node. - View Dependent Claims (12, 13)
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14. A method of operating an integrated circuit device, wherein the integrated circuit device comprises (i) a transmitter stage, (ii) a receiver stage, (iii) two interface pins configured for connection to an antenna, and (iv) a switching component, wherein the switching component comprises a plurality of switches, and wherein the method comprises:
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operating the switching component in one of a first configuration and a second configuration; while operating the switching component in the first configuration, transmitting, by the switching component, a transmit signal from the transmitter stage to at least one of the two interface pins, electrically isolating, by the switching component, the transmitter stage from the receiver stage, and operating the plurality of switches such that each of the plurality of switches is in a closed state; and while operating the switching component in the first configuration, transmitting, by the switching component, a receive signal from at least one of the two interface pins to the receiver stage to the receiver stage, electrically isolating, by the switching component, the antenna from the transmitter stage, and operating the plurality of switches such that each of the plurality of switches is in an open state.
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Specification