Low noise amplifier for wireless communications
First Claim
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1. A low noise amplifier for a wireless communication system, comprising:
- an arrangement of active elements forming an amplifier having a signal input and a bias input and a signal output;
an interconnection node between two of said active elements;
an inductive element connected at one end to said interconnection node;
a capacitance element connecting another end of said inductive element to ground, said inductive element and said capacitance element being selected to provide a notch filter for substantially reducing an amplitude of a predetermined frequency from a signal at said signal output; and
a further active element connected to an interconnection node between said inductive element and said capacitance element, said further active element connected between said active elements and a supply voltage and having a connection to a control signal at an control input.
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Abstract
A low noise amplifier is provided for the receiver of a wireless communications system. The amplifier incorporates an image rejection function by incorporating a notch filter formed by an inductor and capacitor connected at a node between two active elements of the amplifier. The amplifier also incorporates a gain control function by adding a further active element connected to, on one hand, a node between the inductor and capacitor and, on the other hand, a voltage supply. A gain control signal is connected to the control input of the further active element has an input connected to a feedback lead of the receiver to provide the gain control.
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Citations
30 Claims
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1. A low noise amplifier for a wireless communication system, comprising:
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an arrangement of active elements forming an amplifier having a signal input and a bias input and a signal output; an interconnection node between two of said active elements; an inductive element connected at one end to said interconnection node; a capacitance element connecting another end of said inductive element to ground, said inductive element and said capacitance element being selected to provide a notch filter for substantially reducing an amplitude of a predetermined frequency from a signal at said signal output; and a further active element connected to an interconnection node between said inductive element and said capacitance element, said further active element connected between said active elements and a supply voltage and having a connection to a control signal at an control input. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A low noise amplifier for use in a-wireless communications system, comprising:
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a first transistor having a control input connected to receive an input signal and having second and third leads; a second transistor having a control input connected to receive a bias voltage and having second and third leads, said third lead of second transistor being connected to said second lead of said first transistor at an interconnection node; a first inductor connected between said control input of said fast transistor and a signal input for said low noise amplifier; a second inductor connected between said third lead of said first transistor and ground; a third inductor connected between said second lead of said second transistor and a supply voltage; a first capacitive element connected between said second lead of said second transistor and an output of said low noise amplifier; a fourth inductor connected to said interconnection node between said first and second transistors, said fourth inductor having an opposite end at a second interconnection node; a second capacitive element connected between said second interconnection node and ground; and a third active element having a second lead connected between said second lead of said second transistor and having a third lead connected to said second interconnection node, said third active element having a control input. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A low noise amplifier for use in a wireless communications system receiver, comprising:
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a first transistor having a control input connected to receive an input signal and having second and third leads; a second transistor having a control input connected to receive a bias voltage and having second and third leads, said third lead of second transistor being connected to said second lead of said first transistor at an interconnection node; a first inductor connected between said control input of said first transistor and a signal input for said low noise amplifier; a second inductor connected between said third lead of said first transistor and ground; a third inductor connected between said second lead of said second transistor and a supply voltage; a first capacitive element connected between said second lead of said second transistor and an output of said low noise amplifier; a fourth inductor connected to said interconnection node between said first and second transistors, said fourth inductor having an opposite end at a second interconnection node; a second capacitive element connected between said second interconnection node and ground; and a third active element having a second lead connected between said second lead of said second transistor and having a third lead connected to said second interconnection node, said third active element having a control input. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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30. A low noise amplifier for a wireless communication system, comprising:
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an arrangement of active elements forming an amplifier having a signal input and a bias input and a signal output; an interconnection node between two of said active elements; an inductive element connected at one end to said interconnection node; a capacitance element connecting another end of said inductive element to ground, said inductive element and said capacitance element being selected to provide a notch filter for substantially reducing an amplitude of a predetermined frequency from a signal at said signal output;
said inductive element being a spiral inductor and said capacitive element being a metal-insulator-metal capacitor, wherein said active elements are integrated on a semiconductor chip and said spiral inductor and said metal-insulator-metal capacitor are integrated on said same chip; anda further active element connected to an interconnection node between said inductive element and said capacitance element, said further active element connected between said active elements and a supply voltage and having a connection to a control signal at an control input, said further active element being integrated on said same semiconductor chip with said active elements.
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Specification