Impedance matching techiques for multi-band or wideband RF amplifiers and associated amplifier designs
First Claim
1. A circuit for multi-band or wideband impedance matching in a radio-frequency amplifier, comprising:
- an amplifier stage comprising at least one input terminal and one output terminal; and
at least one feedback path between the input terminal and the output terminal, wherein the feedback path comprises a variable impedance used to tune the amplifier to different multi-band or wideband frequencies.
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Abstract
Multi-band or wideband impedance matching in RF amplifiers is disclosed, using variable negative feedback. The feedback is provided by variable impedance connected between the input and output terminals of an inverting amplifier, which may be single-ended, or differential. The variable impedance is used in conjunction with a fixed input impedance matching network to tune the variable impedance to different frequencies. The variable impedance feedback can also be used for gain control, and has the added benefit of stabilizing the amplifier. Both multi-band and wideband amplification can be optimized through the use of the disclosed circuitry and techniques. Use of an output impedance matching network in conjunction with the RF amplifier is optional.
64 Citations
20 Claims
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1. A circuit for multi-band or wideband impedance matching in a radio-frequency amplifier, comprising:
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an amplifier stage comprising at least one input terminal and one output terminal; and
at least one feedback path between the input terminal and the output terminal, wherein the feedback path comprises a variable impedance used to tune the amplifier to different multi-band or wideband frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A circuit for adjusting a gain of multi-band or wideband radio-frequency amplifier, comprising:
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an amplifier stage comprising at least one input terminal and one output terminal;
at least one feedback path between the input terminal and the output terminal, wherein the feedback path comprises a variable impedance matched to the gain of the amplifier at multi-band or wideband frequencies; and
a current source coupled to the amplifier stage, wherein the current source is variable in accordance with the gain of the amplifier. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification