CMOS transceiver analog front end having a combined power amplifier and low noise amplifier
First Claim
1. A complementary metal oxide semiconductor (CMOS) transceiver analog front end circuit comprising:
- a combined transmit and receive amplifier block including;
a transmit amplifier stage that receives a transmit differential signal at a first pair of nodes and produces a first stage amplified transmit differential signal at a third pair of nodes;
a shared transmit/receive amplifier stage that couples between the third pair of nodes and a second pair of nodes;
wherein, in transmit mode, the shared transmit/receive amplifier stage receives the first stage amplified transmit differential signal at the third pair of nodes and produces an amplified transmit differential signal at the second pair of nodes; and
,wherein, in receive mode, the shared transmit/receive amplifier stage receives a receive differential signal at the second pair of nodes and produces an amplified receive differential signal at the third pair of nodes; and
a first bias voltage coupled to the shared transmit/receive amplifier stage;
an RF choke block coupled between the second pair of nodes and a pair of input/output nodes through which the amplified transmit differential signal and the receive differential signal couple to an antenna;
a selectable power feed, responsive to a transmit/receive control signal, coupled to the RF choke block;
a switched power feed, responsive to the transmit/receive control signal, coupled to the third pair of nodes.
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Accused Products
Abstract
A complementary metal oxide semiconductor transceiver analog front end circuit includes a combined transmit and receive amplifier block that produces an amplified transmit differential signal and receives a receive differential signal through the same pair of input/output nodes coupled to an external network through an RF choke block. In one embodiment the combined transmit and receive amplifier block includes separate power amplifier and low noise amplifier circuits, while a second embodiment includes a power amplification stage and a combined power amplification/low noise amplification stage. The amplifier circuits may be constructed using a combination of thin oxide core transistors and thick oxide input/output transistors. DC feeds may be selected to power the circuits in response to a transmit/receive control signal. Bias voltages to the amplifier circuits'"'"' transistors may also be set in response to the transmit/receive control signal.
30 Citations
22 Claims
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1. A complementary metal oxide semiconductor (CMOS) transceiver analog front end circuit comprising:
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a combined transmit and receive amplifier block including; a transmit amplifier stage that receives a transmit differential signal at a first pair of nodes and produces a first stage amplified transmit differential signal at a third pair of nodes; a shared transmit/receive amplifier stage that couples between the third pair of nodes and a second pair of nodes; wherein, in transmit mode, the shared transmit/receive amplifier stage receives the first stage amplified transmit differential signal at the third pair of nodes and produces an amplified transmit differential signal at the second pair of nodes; and
,wherein, in receive mode, the shared transmit/receive amplifier stage receives a receive differential signal at the second pair of nodes and produces an amplified receive differential signal at the third pair of nodes; and a first bias voltage coupled to the shared transmit/receive amplifier stage; an RF choke block coupled between the second pair of nodes and a pair of input/output nodes through which the amplified transmit differential signal and the receive differential signal couple to an antenna; a selectable power feed, responsive to a transmit/receive control signal, coupled to the RF choke block; a switched power feed, responsive to the transmit/receive control signal, coupled to the third pair of nodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A CMOS transceiver analog front end circuit comprising:
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a combined transmit and receive amplifier block that receives a transmit differential signal at a first pair of nodes and produces an amplified transmit differential signal at a second pair of nodes and that receives a receive differential signal at the second pair of nodes and produces an amplified receive differential signal at a third pair of nodes; an RF choke block coupled between the second pair of nodes and a pair of input/output nodes through which the amplified transmit differential signal and the receive differential signal couple to an antenna; a selectable power feed, responsive to a transmit/receive control signal, coupled to the RF choke block; and
,a switched power feed, responsive to the transmit/receive control signal, coupled to the third pair of nodes. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A CMOS transceiver analog front end circuit comprising:
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a combined transmit and receive amplifier block that receives a transmit differential signal at a first pair of nodes and produces an amplified transmit differential signal at a second pair of nodes and that receives a receive differential signal at the second pair of nodes and produces an amplified receive differential signal at a third pair of nodes; an RF choke block coupled between the second pair of nodes and a pair of input/output nodes through which the amplified transmit differential signal and the receive differential signal couple to an antenna; and a power feed coupled to the RF choke block. - View Dependent Claims (19, 20, 21, 22)
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Specification