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US 2013/0293291 A1Published application
Quality factor tuning for lc circuits
AssigneeAnalog Devices, Inc.
InventorHyman Shanan
Life of this patent
Estimating the term…
Abstract
Apparatus and methods are also disclosed related to tuning a quality factor of an LC circuit. In some implementations, the LC circuit can be embodied in a low-noise amplifier (LNA). A quality factor adjustment circuit can increase and/or decrease conductance across the LC circuit. This can stabilize a parasitic resistance in parallel with the LC circuit. In this way, a gain of the LC circuit can be stabilized.
Claims29
An apparatus comprising:
- an LC circuit having a first end and a second end, the LC circuit having a resonant frequency;
- a positive transconductance circuit operatively coupled to the LC circuit and configured to increase the conductance between the first end of the LC circuit and the second end of the LC circuit;
- and
- a negative transconductance circuit operatively coupled to the LC circuit and configured to decrease the conductance between the first end of the LC circuit and the second end of the LC circuit.
1 more element
An apparatus comprising a low noise amplifier (LNA), the LNA comprising:
- an LC circuit having a first node and a second node;
- and
- a quality factor tuning circuit electrically coupled to the first node of the LC circuit and the second node of the LC circuit, the quality factor tuning circuit configured to stabilize a gain of the LNA by adjusting a conductance between the first node of the LC circuit and the second node of the LC circuit.
A method of tuning a quality factor of an LC circuit, the method comprising:
- generating, using a control block, an indication of a variation in the quality factor of the LC circuit;
- adjusting, using a quality factor tuning circuit configured to receive an input from the control block, a resistance from a first end of the LC circuit and a second end of the LC circuit based at least in part on the indication of the variation;
- and
- stabilizing the resistance from the first end of the LC circuit and the second end of the LC circuit as operating conditions of the LC circuit change using the control block to control the quality factor tuning circuit.
1 more element
Dependencies are inferred from the claim text.