PIN diode network for multiband RF coupling
First Claim
1. A PIN diode network, comprising:
- an input port;
an output port;
a PIN diode configured to selectively couple the input port to the output port by application of a forward bias to the PIN diode, the PIN diode having a stray capacitance in an off state upon removal of the forward bias;
a first inductor in parallel with the PIN diode, the first inductor configured to self-resonate at a first operating frequency of the PIN diode network with the stray capacitance of the PIN diode when the PIN diode is in the off state; and
a second inductor in parallel with the PIN diode, the second inductor configured to self-resonate at a second operating frequency of the PIN diode network with the stray capacitance of the PIN diode when the PIN diode is in the off state.
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Accused Products
Abstract
A PIN diode network includes a parallel inductor. In the off state of the PIN diode, the inductor forms a resonant tank circuit in parallel with the PIN diode. The inductor is selected based on the stray capacitance of the PIN diode so that the self resonant frequency (SRF) of the tank circuit is at or near the desired operating frequency. At the operating frequency, the impedance of the tank circuit is essentially infinite. At the operating frequency, isolation is improved for the PIN diode network as compared to a PIN diode alone. The PIN diode network allows a lower specification PIN diode to operate with higher isolation. The PIN diode network allows a lower specification PIN diode to operate at a higher frequency than would otherwise be possible due to intrinsic stray capacitance of the PIN diode.
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Citations
18 Claims
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1. A PIN diode network, comprising:
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an input port;
an output port;
a PIN diode configured to selectively couple the input port to the output port by application of a forward bias to the PIN diode, the PIN diode having a stray capacitance in an off state upon removal of the forward bias;
a first inductor in parallel with the PIN diode, the first inductor configured to self-resonate at a first operating frequency of the PIN diode network with the stray capacitance of the PIN diode when the PIN diode is in the off state; and
a second inductor in parallel with the PIN diode, the second inductor configured to self-resonate at a second operating frequency of the PIN diode network with the stray capacitance of the PIN diode when the PIN diode is in the off state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method, comprising:
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receiving into an input port a first frequency and a second frequency, the input port selectively coupled to an output port by a PIN diode;
if the PIN diode is forward biased, coupling the first frequency and the second frequency to the output port;
otherwise, blocking the first frequency by self resonance of a first inductor and a stray capacitance of the PIN diode and blocking the second frequency by self resonance of a second inductor and the stray capacitance of the PIN diode. - View Dependent Claims (10, 11, 12, 13)
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14. A system for multiband RF coupling, comprising:
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an input port for receiving a first frequency and a second frequency;
an output port; and
means for selectively isolating the first frequency and the second frequency from the output port. - View Dependent Claims (15, 16, 17, 18)
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Specification