Transmit/receive switch
First Claim
1. In combination:
- means for amplifying an applied signal and operating with a relatively high output impedance when power is applied thereto, such means being inhibited from amplifying the applied signal when power is removed therefrom;
means, responsive to a control signal, for switchably applying power to the amplifying means during a first operating mode and removing power from the amplifying means during a second operating mode to switch the relatively high output impedance of such amplifying means to a relatively low output impedance; and
means for coupling the amplified signal to an output port during the first operating mode, and for transforming the relatively low output impedance to a relatively high impedance at the output port during the second operating mode.
2 Assignments
0 Petitions
Accused Products
Abstract
A transceiver transmit/receive (T/R) switching arrangement for electrically decoupling the transceiver'"'"'s receiver circuit from first and second transceiver ports during transmission, and for electrically decoupling the transceiver'"'"'s transmitter circuit from the first and second transceiver ports during reception. Each such circuit includes an amplifier for amplifying an applied microwave signal and operating with a relatively high output impedance when power is applied thereto. Each amplifier is inhibited from amplifying an applied microwave signal when power is removed therefrom. First bias means switchably applies power to the transmitter amplifier during transmission and removes power from the transmitter amplifier during reception to switch the relatively high output impedance of such amplifier to a relatively low output impedance. Second bias means switchably applies power to the receiver amplifier during reception and removes power from the receiver amplifier during transmission to switch the relatively high output impedance of such amplifier to a relatively low output impedance. Additional circuitry in the transmitter circuit couples the amplified microwave signal from the transmitter amplifier to the second transceiver port during transmission, and transforms the relatively low output impedance of the transmitter amplifier to a relatively high impedance at the second transceiver port during reception. Similar circuitry in the receiver circuit couples the amplified microwave signal from the receiver amplifier to the first transceiver port during reception, and transforms the relatively low output impedance of the receiver amplifier to a relatively high impedance at the first transceiver port during transmission.
-
Citations
24 Claims
-
1. In combination:
-
means for amplifying an applied signal and operating with a relatively high output impedance when power is applied thereto, such means being inhibited from amplifying the applied signal when power is removed therefrom; means, responsive to a control signal, for switchably applying power to the amplifying means during a first operating mode and removing power from the amplifying means during a second operating mode to switch the relatively high output impedance of such amplifying means to a relatively low output impedance; and means for coupling the amplified signal to an output port during the first operating mode, and for transforming the relatively low output impedance to a relatively high impedance at the output port during the second operating mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. In a transceiver wherein a signal is coupled from a first port to a second port through a first circuit having a characteristic impedance during a first operating mode, and a signal is coupled from the second port to the first port through a second circuit having a characteristic impedance during a second operating mode, the second circuit being substantially electrically decoupled from the first and second ports during the first operating mode and the first circuit being substantially electrically decoupled from the first and second ports during the second operating mode, the improvement comprising:
-
first and second amplifying means, correspondingly disposed in the first and second circuits, for amplifying signals applied thereto and operating with a relatively high output impedance when power is applied thereto, such first and second amplifying means being inhibited from amplifying signals applied thereto when power is removed therefrom; means, responsive to a first control signal, for switchably applying power to the first amplifying means during the first operating mode and removing such power from the first amplifying means during the second operating mode to switch the relatively high output impedance of the first amplifying means to a relatively low output impedance; means, responsive to a second control signal, for switchably applying power to the second amplifying means during the second operating mode and removing such power from the second amplifying means during the first operating mode to switch the relatively high output impedance of the second amplifying means to a relatively low output impedance; first means for coupling the amplified signal from the first amplifying means to the second port during the first operating mode, and for transforming, during the second operating mode, the relatively low output impedance of the first amplifying means to an impedance at the second port substantially higher than the characteristic impedance of the second circuit; and second means for coupling the amplified signal from the second amplifying means to the first port during the second operating mode, and for transforming, during the first operating mode the relatively low output impedance of the second amplifying means to an impedance at the first port substantially higher than the characteristic impedance of the first circuit. - View Dependent Claims (10, 11, 12)
-
-
13. A microwave transceiver comprising:
-
(a) a transmitter circuit comprising; a transmitter amplifier; a first transmission line, having a characteristic impedance, coupled between a first port and an input of the transmitter amplifier; and a second transmission line, having a characteristic impedance, coupled between an output of the transmitter amplifier and a second port; the transmitter circuit coupling an applied microwave signal therethrough from the first port to the second port during a transmission mode; (b) a receiver circuit comprising; a receiver amplifier; a third transmission line, having a characteristic impedance, coupled between the second port and an input of the receiver amplifier; and a fourth transmission line, having a characteristic impedance, coupled between an output of the receiver amplifier and the first port; the receiver circuit coupling an applied microwave signal therethrough from the second port to the first port during a reception mode; (c) means, responsive to control signals, for coupling power to the transmitter amplifier and decoupling power from the receiver amplifier during the transmission mode, and for decoupling power from the transmitter amplifier and coupling power to the receiver amplifier during the reception mode, wherein the one of the amplifiers having power coupled thereto amplifies a microwave signal applied to the input thereof, produces the amplified microwave signal at an output, and operates with a relatively high output impedance, and the one of the amplifiers having power decoupled therefrom is inhibited from amplifying a microwave signal applied to the input thereof and operates with a relatively low output impedance; (d) first means, including the second transmission line, for coupling the amplified microwave signal from the output of the transmitter amplifier to the second port during the transmission mode, and for transforming, during the reception mode, the relatively low output impedance of the transmitter amplifier to an impedance at the second port substantially higher than the characteristic impedance of the third transmission line; and (e) second means, including the fourth transmission line, for coupling the amplified microwave signal from the output of the receiver amplifier to the first port during the reception mode, and for transforming, during the transmission mode, the relatively low output impedance of the receiver amplifier to an impedance at the first port substantially higher than the characteristic impedance of the first transmission line. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
-
Specification