Amplification device having compensation for a local thermal memory effect
AssigneeRF Micro Devices, Inc.
InventorsMarcus Granger-Jones, Wayne Kennan
Life of this patent
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Abstract
In one embodiment, an amplification device has a temperature differential sensing circuit that reduces a local thermal memory effect. The amplification device may include an amplification circuit and biasing circuitry. The amplification device is operable to receive an input signal and generate and amplified output signal. The biasing circuitry generates a biasing signal that sets the quiescent operating level of the amplified output signal. The temperature differential sensing circuit provides a bias level adjustment signal that adjusts the biasing signal to maintain the quiescent operating level of the amplified output signal at a desired level.
Claims21
An amplification device that is capable of reducing thermal drift, comprising:
- an amplification circuit operable to receive an input signal and generate an amplified output signal from the input signal;
- biasing circuitry operable to generate a biasing signal and coupled to the amplification circuit wherein the amplification circuit is operably associated with the biasing circuitry so that a quiescent operating level of the amplified output signal is set in accordance with a signal level of the biasing signal;
- and
- a temperature differential sensing circuit configured to detect a temperature difference between a first temperature associated with the amplification circuit and a reference temperature and to generate a bias level adjustment signal based on the temperature difference wherein the biasing circuitry is operably associated with the temperature differential sensing circuit so as to adjust the signal level of the biasing signal in response to the bias level adjustment signal.
A method of reducing a thermal memory effect of an amplification circuit coupled to biasing circuitry, the method comprising:
- detecting a temperature difference between a first temperature associated with the amplification circuit and a reference temperature;
- and
- adjusting a bias level of a biasing signal output from the biasing circuitry to the amplification circuit in accordance with the temperature difference.
An amplification device capable of reducing a thermal memory effect, comprising:
- an amplification circuit operable to receive an input signal and generate an amplified output signal from the input signal;
- a biasing circuit coupled to the amplification circuit and operable to apply a bias level to the input signal wherein the bias level is associated with a quiescent operating level of the amplified output signal;
- a temperature differential sensing circuit coupled to the biasing circuit, the temperature differential sensing circuit being configured to sense a temperature difference between a first temperature associated with the amplification circuit and a reference temperature and produce a bias level adjustment signal based on the temperature difference wherein the biasing circuit is responsive to adjust the bias level applied to the input signal in response to the bias level adjustment signal.
Dependencies are inferred from the claim text.