Package filter and combiner network
First Claim
1. A transceiver front end circuit comprising:
- an antenna terminal capable of being coupled to an antenna;
a first balun circuit having a single input coupled to the antenna terminal and a pair of balanced outputs coupled to a corresponding pair of balanced receiver inputs, the first balun circuit matching an input impedance of the pair of balanced receiver inputs and substantially phase shifting an input reflection coefficient of the pair of balanced receiver inputs by about 180-degrees;
a second balun circuit having a single output coupled to the antenna terminal and a pair of balanced inputs coupled to a corresponding pair of balanced transmitter outputs, the second balun circuit matching an output impedance of the pair of balanced transmitter outputs and substantially phase shifting an output reflection coefficient of the pair of balanced transmitter outputs by about 180-degrees and the first balun circuit and the second balun circuit being contained within a single package;
a first shunt switch coupled across the pair of receiver inputs, including a first transistor coupled across the pair of receiver inputs, and a means for increasing a depletion zone of the first transistor when the first shunt switch is open; and
a second shunt switch coupled across the pair of transmitter outputs, including a second transistor coupled across the pair of transmitter outputs, and a means for increasing a depletion zone of the second transistor when the second shunt switch is open.
10 Assignments
0 Petitions
Accused Products
Abstract
A transceiver front end circuit includes an antenna terminal capable of being coupled to an antenna. A first balun circuit has a single input that is coupled to the antenna terminal, and a pair of balanced outputs coupled to a corresponding pair of balanced receiver inputs. The first balun circuit matches an input impedance of the pair of balanced receiver inputs and substantially phase shifts the input reflection coefficient of the pair of balanced receiver inputs by about 180-degrees. A second balun circuit has a single output coupled to the antenna terminal and a pair of balanced inputs coupled to a corresponding pair of balanced transmitter outputs. The second balun circuit matches an output impedance of the pair of balanced transmitter outputs and substantially phase shifts the output reflection coefficient of the pair of balanced transmitter outputs by about 180-degrees. The first balun circuit and the second balun circuit can be contained within a single package. A first shunt switch can be coupled across the pair of receiver inputs. A second shunt switch can be coupled across the pair of transmitter outputs.
-
Citations
23 Claims
-
1. A transceiver front end circuit comprising:
-
an antenna terminal capable of being coupled to an antenna; a first balun circuit having a single input coupled to the antenna terminal and a pair of balanced outputs coupled to a corresponding pair of balanced receiver inputs, the first balun circuit matching an input impedance of the pair of balanced receiver inputs and substantially phase shifting an input reflection coefficient of the pair of balanced receiver inputs by about 180-degrees; a second balun circuit having a single output coupled to the antenna terminal and a pair of balanced inputs coupled to a corresponding pair of balanced transmitter outputs, the second balun circuit matching an output impedance of the pair of balanced transmitter outputs and substantially phase shifting an output reflection coefficient of the pair of balanced transmitter outputs by about 180-degrees and the first balun circuit and the second balun circuit being contained within a single package; a first shunt switch coupled across the pair of receiver inputs, including a first transistor coupled across the pair of receiver inputs, and a means for increasing a depletion zone of the first transistor when the first shunt switch is open; and a second shunt switch coupled across the pair of transmitter outputs, including a second transistor coupled across the pair of transmitter outputs, and a means for increasing a depletion zone of the second transistor when the second shunt switch is open. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A method of switching between a receive mode and a transmit mode comprising:
-
coupling an input of a first balun circuit to an antenna terminal and coupling a pair of outputs of the first balun circuit to a corresponding pair of balanced receiver inputs, the first balun circuit matching an input impedance of the pair of balanced receiver inputs and substantially phase shifting an input reflection coefficient of the pair of balanced receiver inputs by about 180-degrees; coupling an output of a second balun circuit to the antenna terminal and coupling a pair of inputs of the second balun circuit to a corresponding pair of balanced transmitter outputs, the second balun circuit matching an output impedance of the pair of balanced transmitter outputs and substantially phase shifting an output reflection coefficient of the pair of balanced transmitter outputs by about 180-degrees the first balun circuit and the second balun circuit being contained within a single package; shorting the pair of receiver inputs during a transmit mode, wherein shorting the pair of receiver inputs includes closing a first transistor coupled across the pair of receiver inputs; shorting the pair of transmitter outputs during a receive mode, wherein shorting the pair of transmitter outputs includes closing a second transistor coupled across the pair of transmitter outputs; and increasing a depletion zone for the first transistor during the receive mode, and increasing a depletion zone for the second transistor during the transmit mode. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
-
Specification