Method for altering a difference frequency signal and amplifier circuit thereof
First Claim
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1. An amplifier circuit, comprising:
- a transistor having first and second current carrying electrodes and a control electrode; and
a sub-harmonic termination element having first and second terminals, the first terminal of the sub-harmonic termination element coupled to the first current carrying electrode, wherein the sub-harmonic termination element alters a difference frequency signal between a desired transmitted signal and an undesired low band frequency signal.
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Abstract
A method and amplifier circuit (20) for conditioning a signal. The amplifier circuit (20) includes a field effect transistor (22) having a sub-harmonic termination (21) connected to a drain of the field effect transistor (22). In addition, an output impedance termination (24) is connected to the drain of the field effect transistor (22) and an input impedance termination (23) is connected to the gate of the field effect transistor (22). The sub-harmonic termination (21) reduces a non-linear component of an interference signal.
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Citations
20 Claims
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1. An amplifier circuit, comprising:
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a transistor having first and second current carrying electrodes and a control electrode; and a sub-harmonic termination element having first and second terminals, the first terminal of the sub-harmonic termination element coupled to the first current carrying electrode, wherein the sub-harmonic termination element alters a difference frequency signal between a desired transmitted signal and an undesired low band frequency signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An amplifier circuit, comprising:
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an amplifier circuit having an input and an output; and a sub-harmonic termination element having first and second terminals, the first terminal coupled to the output, wherein the sub-harmonic termination element alters a difference frequency signal between a desired transmitted signal and an undesired low band frequency signal. - View Dependent Claims (14, 15, 16, 17)
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18. A method for conditioning a signal, comprising the steps of:
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receiving an input signal of a first frequency; receiving an undesired signal of a second frequency; generating an interference signal from the undesired signal and a transmit signal, wherein the interference signal has a difference frequency signal component; and reducing the amplitude of the difference frequency signal component of the interference signal with a sub-harmonic termination, thereby linearizing the signal. - View Dependent Claims (19, 20)
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Specification