Dual band tuning
First Claim
Patent Images
1. A dual band RF tuning circuit comprising:
- a first impedance element and a second impedance element between an RF input port and an RF output port, the tuning circuit being tuned by the first and second impedance elements to receive a first RF signal and to provide the first RF signal at the output port, the tuning circuit being tuned by the first impedance element alone to receive a second RF signal and to provide the second RF signal at the output port, a switching transistor being switched on and off by changing its bias voltage, a band control voltage source connected to the switching transistor to change its bias voltage, and the switching transistor having conducting gates connected to the second impedance element to short the second impedance element, which tunes the tuning circuit by the first impedance element.
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Abstract
A dual band RF tuning circuit (1) has a first impedance element (4) and a second impedance element (5) between an RF input port (2) and an RF output port (3), tuning being provided by the impedance elements (4, 5) to a first RF signal, and a switching transistor (9) connected to the second impedance element (5) to open circuit the second impedance element (5) for tuning to a second RF signal by the first impedance element (4) alone.
49 Citations
21 Claims
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1. A dual band RF tuning circuit comprising:
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a first impedance element and a second impedance element between an RF input port and an RF output port, the tuning circuit being tuned by the first and second impedance elements to receive a first RF signal and to provide the first RF signal at the output port, the tuning circuit being tuned by the first impedance element alone to receive a second RF signal and to provide the second RF signal at the output port, a switching transistor being switched on and off by changing its bias voltage, a band control voltage source connected to the switching transistor to change its bias voltage, and the switching transistor having conducting gates connected to the second impedance element to short the second impedance element, which tunes the tuning circuit by the first impedance element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 16, 17, 18)
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9. A dual band RF tuning circuit comprising:
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a first inductance impedance element and a second inductance impedance element between an RF input port and an RF output port, the tuning circuit being tuned by the first and second inductance impedance elements to receive a first RF signal and to provide the first RF signal at the output port, the tuning circuit being tuned by the first inductance impedance element alone to receive a second RF signal and to provide the second RF signal at the output port, a first switching transistor being switched on and off by changing its bias voltage, a band control voltage source connected to the first switching transistor to change its bias voltage, the first switching transistor having conducting drain and source nodes connected to the second inductance impedance element to short the second inductance impedance element, which tunes the tuning circuit by the first inductance impedance element, a first capacitance impedance element and a second capacitance impedance element between the RF input port and the RF output port, the tuning circuit being tuned by the first and second capacitance impedance elements to receive a first RF signal and to provide the first RF signal at the output port, the tuning circuit being tuned by the first capacitance impedance element alone to receive a second RF signal and to provide the second RF signal at the output port, a second switching transistor being switched on and off by changing its bias voltage, the band control voltage source connected to the second switching transistor to change its bias voltage, and the second switching transistor having conducting drain and source nodes connected to the second capacitance impedance element to short the second capacitance impedance element, which tunes the tuning circuit by the first capacitance impedance element. - View Dependent Claims (10, 11, 12, 13, 14, 15, 19, 20, 21)
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Specification