Integrated tunable resonance circuit
First Claim
1. An integrated tunable resonance circuit for providing a high-frequency output signal with a frequency that is dependent on a control signal, the circuit comprising:
- a parallel resonance circuit with a first inductive element and an output for providing the high-frequency output signal;
a second inductive element, which is coupled mutually to the first inductive element; and
a switching unit connected in parallel to the second inductive element and having multiple parallel branches, the branches including a first branch formed of a switch having a control terminal for switching between states and a second branch formed of a capacitive unit, wherein the switching unit exhibits a capacitive behavior in a first state with the switch open and a resistive behavior in a second state with the switch closed, the resonance circuit driving the control terminal of the switch as a function of the control signal.
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Accused Products
Abstract
An integrated tunable resonance circuit is provided for providing a high-frequency output signal with a frequency dependent on a control signal, comprising a parallel resonance circuit with a first inductive element and an output for providing the high-frequency output signal, a switching unit with a controlled path, and a control terminal for switching between states, whereby the switching unit is designed to exhibit a predominantly capacitive behavior in a first state and a predominantly resistive behavior in a second state, whereby the resonance circuit is designed to drive the control terminal of the switching unit as a function of the control signal. The resonance circuit has a second inductive element which can be mutually coupled to the first inductive element, whereby the controlled path is connected parallel to the second inductive element. The invention relates furthermore to a voltage-controlled oscillator and to an integrated circuit.
31 Citations
22 Claims
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1. An integrated tunable resonance circuit for providing a high-frequency output signal with a frequency that is dependent on a control signal, the circuit comprising:
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a parallel resonance circuit with a first inductive element and an output for providing the high-frequency output signal; a second inductive element, which is coupled mutually to the first inductive element; and a switching unit connected in parallel to the second inductive element and having multiple parallel branches, the branches including a first branch formed of a switch having a control terminal for switching between states and a second branch formed of a capacitive unit, wherein the switching unit exhibits a capacitive behavior in a first state with the switch open and a resistive behavior in a second state with the switch closed, the resonance circuit driving the control terminal of the switch as a function of the control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An integrated tunable resonance circuit for providing a high-frequency output signal with a frequency that is dependent on a control signal, the circuit comprising:
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a parallel resonance circuit with a first inductive element and an output for providing the high-frequency output signal; a switching unit with a controlled path and a control terminal for switching between states, wherein the switching unit exhibits a capacitive behavior in a first state and a resistive behavior in a second state, the resonance circuit driving the control terminal of the switching unit as a function of the control signal; and a second inductive element, which is coupled mutually to the first inductive element, wherein the controlled path is connected in parallel to the second inductive element, wherein the second inductive element has two series-connected inductive subelements, and wherein a first potential value is applied at the connection point of the inductive subelements when the switching unit is in the first state, and a different second potential value is applied when the switching unit is in the second state.
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Specification