Single-stage dual-band low-noise amplifier for use in a wireless communication system receiver
First Claim
1. A low-noise amplifier comprising:
- an amplification stage for amplifying a signal applied to an input of the amplifier; and
an input matching network coupled between the input of the amplifier and an input of the amplification stage, the input matching network using a set of elements to provide a match in a first frequency band, and at least a subset of the set of elements to provide a match in a second frequency band, wherein the set of elements includes a first capacitor and a second capacitor connected in series between the amplifier input and the amplification stage input, a first inductor connected from a point between the first and second capacitors to a first circuit potential of the amplifier, and a second inductor connected from the amplification stage input to a second circuit potential of the amplifier.
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Accused Products
Abstract
A low-noise amplifier capable of operation in two or more frequency bands of a personal communication services (PCS) receiver or other wireless communication system terminal. An exemplary embodiment of the amplifier includes a single bipolar junction transistor amplification stage. Input and output matching networks for the transistor each include a first series capacitor, a shunt inductor coupled to ground potential, a second series capacitor and a second inductor coupled to a supply voltage. These four elements are used to provide narrowband input or output matches in two distinct frequency bands, such as 900 MHz and 1.8 GHz. The first series capacitors in the input and output matching networks may also be used to provide DC input and output isolation, respectively, and the second inductors of the input and output matching networks may be used to supply DC bias to the base and collector, respectively, of the amplifier transistor. The matching networks may be configured using only lumped inductive and capacitive elements, with values limited to less than about 10 nH and 10 pF, respectively. The amplifier may be configured to provide a minimum gain of 15 dB and a maximum noise figure of 2 dB over 100 MHz-wide bands centered at 900 MHz and 1.8 GHz.
86 Citations
30 Claims
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1. A low-noise amplifier comprising:
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an amplification stage for amplifying a signal applied to an input of the amplifier; and an input matching network coupled between the input of the amplifier and an input of the amplification stage, the input matching network using a set of elements to provide a match in a first frequency band, and at least a subset of the set of elements to provide a match in a second frequency band, wherein the set of elements includes a first capacitor and a second capacitor connected in series between the amplifier input and the amplification stage input, a first inductor connected from a point between the first and second capacitors to a first circuit potential of the amplifier, and a second inductor connected from the amplification stage input to a second circuit potential of the amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of operating a low-noise amplifier in multiple frequency bands, the method comprising the steps of:
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amplifying a signal applied to an input of the amplifier in an amplification stage; and utilizing a set of elements of an input matching network to provide an input match for the amplifier in a first frequency band, the set of elements including a first capacitor and a second capacitor connected in series between the amplifier input and an input of the amplification stage, a first inductor connected from a point between the first and second capacitors to a first circuit potential of the amplifier, and a second inductor connected from the amplification stage input to a second circuit potential of the amplifier; and utilizing at least a subset of the set of elements to provide an input match for the amplifier in a second frequency band. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. A low-noise amplifier comprising:
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an amplification stage for amplifying a signal applied to an input of the amplifier; an input matching network coupled between the input of the amplifier and an input of the amplification stage; and an output matching network coupled between an output of the amplification stage and an output of the amplifier, wherein at least one of the input matching network and the output matching network utilizes common elements of a single set of elements to provide narrowband matches in both a first frequency band and a second frequency band, the set of elements including a first capacitor and a second capacitor connected in series, a first inductor connected from a first point, between the first and second capacitors to a first circuit potential of the amplifier, and a second inductor connected from a second point, on a side of the first or second capacitor opposite the first point, to a second circuit potential of the amplifier.
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25. A signal receiver comprising:
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at least one antenna for receiving a signal in at least one of a first frequency band and a second frequency band; a filter having an input coupled to an output of the at least one antenna, the filter providing filtering of the received signal in at least one of the first and second frequency bands; a low-noise amplifier having an input coupled to an output of the filter, the amplifier amplifying the received signal applied to the amplifier input, the amplifier including an input matching network which uses a set of elements to provide a match in the first frequency band, and at least a subset of the set of elements to provide a match in the second frequency band the set of elements including a first capacitor and a second capacitor connected in series between the amplifier input and an input of an amplification stage, a first inductor connected from a point between the first and second-capacitors to a first circuit potential of the amplifier, and a second inductor connected from the amplification stage input to a second circuit potential of the amplifier; and a signal converter having an input coupled to an output of the amplifier, the signal converter converting the received signal to an intermediate frequency. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification