High-isolation transmit/receive switch on CMOS for millimeter-wave applications
First Claim
1. A CMOS monolithic transmit/receive (T/R) switch comprising:
- a single pole double throw switch (SPDT) module operable to selectively connect an antenna port to either a transmit port or to a receive port;
a transmit matching network comprising a first transmission line matching the impedance of the transmit port of the SPDT module to a transmit impedance, and a first shunt transistor operable to selectively ground a transmitter end of the first transmission line; and
a receive matching network comprising a second transmission line matching the impedance of the receive port of the SPDT module to a receive impedance, and a second shunt transistor operable to selectively ground a receiver end of the second transmission line.
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Accused Products
Abstract
A CMOS monolithic transmit/receive switch comprises a single pole double throw switch (SPDT) module operable to selectively connect an antenna port to either a transmit port or to a receive port. A transmit matching network comprising a first transmission line matches the impedance of the transmit port of the SPDT module to a transmit impedance, and a first shunt transistor is operable to selectively ground a transmitter end of the first transmission line. A receive matching network comprising a second transmission line matches the impedance of the receive port of the SPDT module to a receive impedance, and a second shunt transistor is operable to selectively ground a receiver end of the second transmission line.
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Citations
11 Claims
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1. A CMOS monolithic transmit/receive (T/R) switch comprising:
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a single pole double throw switch (SPDT) module operable to selectively connect an antenna port to either a transmit port or to a receive port; a transmit matching network comprising a first transmission line matching the impedance of the transmit port of the SPDT module to a transmit impedance, and a first shunt transistor operable to selectively ground a transmitter end of the first transmission line; and a receive matching network comprising a second transmission line matching the impedance of the receive port of the SPDT module to a receive impedance, and a second shunt transistor operable to selectively ground a receiver end of the second transmission line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11)
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10. A method of transmit/receive switching, the method comprising:
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using a single pole double throw switch (SPDT) module to selectively connect an antenna port to either a transmit port or to a receive port; impedance matching a transmitter to the transmit port by connecting a first transmission line between the transmitter and the transmit port; selectively grounding a transmitter end of the first transmission line, to isolate the transmitter during receive periods; impedance matching a receiver to the receive port by connecting a second transmission line between the receiver and the receive port; and selectively grounding a receiver end of the second transmission line, to isolate the receiver during transmit periods.
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Specification