Resonant radio frequency switch
First Claim
1. Circuitry comprising:
- a first switch;
a second switch;
a first inductor/capacitor (LC) network; and
a second LC network;
wherein;
the first switch is connected between a first high frequency terminal and a second high frequency terminal;
the first LC network is connected in parallel across the first switch;
the second switch is connected between the first high frequency terminal and a first low frequency terminal;
the second LC network is connected in parallel across the second switch; and
the first and second switches are controlled so that the first and second switches have different ON/OFF status during operation of the circuitry.
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Accused Products
Abstract
An SPDT switch in a RF communication transceiver provides for choosing the transmit/receive path for the RF signal. It consists of the series and shunt branches each consisting of stack of FETs. Performance metrics of the RF switch are insertion loss and isolation. At high frequency, the device/FET capacitance and the parasitic capacitances provide a leakage path for the signal, resulting in higher insertion loss and lower isolation. A parallel resonant LC network across each of the series and/or shunt branch FETs in a SPDT switch provides lower insertion loss, higher switch isolation, and lower out of band harmonics when compared to that of the state of the art SPDT switch. A method to reduce the form factor of such switch configuration is disclosed which is useful in wireless front end modules.
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Citations
19 Claims
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1. Circuitry comprising:
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a first switch; a second switch; a first inductor/capacitor (LC) network; and a second LC network; wherein; the first switch is connected between a first high frequency terminal and a second high frequency terminal; the first LC network is connected in parallel across the first switch; the second switch is connected between the first high frequency terminal and a first low frequency terminal; the second LC network is connected in parallel across the second switch; and the first and second switches are controlled so that the first and second switches have different ON/OFF status during operation of the circuitry. - View Dependent Claims (2, 3, 4, 5)
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6. Circuitry comprising:
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a first series switch and a first shunt switch controlled such that the first series switch and the first shunt switch have different ON/OFF status during operation of the circuitry; a second series switch and a second shunt switch controlled such that the second series switch and the second shunt switch have different ON/OFF status during operation of the circuitry; the first series switch and the second series switch controlled so that the first series switch and the second series switch have different ON/OFF status during operation of the circuitry; and a first resonant circuit in parallel with the first series switch. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. Circuitry comprising:
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an RF antenna in series with a first terminal and a second terminal, the RF antenna between the first terminal and the second terminal; a first series switch in series between the RF antenna and the first terminal; a first shunt switch in between the first terminal and a low-frequency terminal; the first series switch and the first shunt switch controlled such that the first series switch and the first shunt switch have different ON/OFF status during operation of the circuitry; a second series switch in series between the RF antenna and the second terminal; a second shunt switch in between the second terminal and a low-frequency terminal; the second series switch and the second shunt switch controlled such that the second series switch and the second shunt switch have different ON/OFF status during operation of the circuitry; a first resonant circuit in parallel with the first series switch and the first shunt switch; and a second resonant circuit in parallel with the second series switch and the second shunt switch; wherein; the first terminal is a communication-receiving terminal; and the second terminal is a communication-transmitting terminal. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification