Low-noise amplifier, receiver, method and computer program
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorHenrik Sjöland
Life of this patent
Estimating the term…
Abstract
A differential cross-coupled common-source or common-emitter low-noise amplifier having capacitive degeneration is disclosed. Further, a radio receiver comprising such a low-noise amplifier is disclosed. Further, a method of controlling switched capacitive networks of an amplifier is disclosed. The method comprises controlling capacitances of the switched degeneration capacitor networks and/or the switched cross-coupling capacitor networks. Further, a computer program for implementing the method is disclosed.
Claims13
A differential cross-coupled common-source or common-emitter low-noise amplifier having capacitive degeneration, wherein the low-noise amplifier comprises:
- a first capacitive cross coupling from gate or base of a first input transistor to source or emitter of a second input transistor, and a second capacitive cross coupling from gate or base of the second input transistor to source or emitter of the first input transistor;
- and
- a differential capacitive degeneration circuit operatively connected between source or emitter of the first input transistor and source or emitter of the second input transistor,
- wherein properties of the capacitive cross couplings and the capacitive degeneration circuits are essentially capacitive at a working frequency of the amplifier.
A differential cross-coupled common-source or common-emitter low-noise amplifier having capacitive degeneration, comprising:
- a first capacitive cross coupling from gate or base of a first input transistor to source or emitter of a second input transistor, and a second capacitive cross coupling from gate or base of the second input transistor to source or emitter of the first input transistor;
- a first capacitive degeneration circuit operatively connected to source or emitter of the first input transistor;
- and
- a second capacitive degeneration circuit operatively connected to source or emitter of the second input transistor,
- wherein properties of the capacitive cross couplings and the capacitive degeneration circuits are essentially capacitive at a working frequency of the amplifier.
A method of controlling a differential cross-coupled common-source or common-emitter low-noise amplifier having capacitive degeneration provided via at least one of switched degeneration capacitor networks and switched cross-coupling capacitor networks, wherein the method comprises controlling an input impedance of the amplifier with respect to external circuitry connected to an input of the amplifier by controlling the capacitances of at least one of:
- the switched cross-coupling capacitor networks, comprising a first capacitive cross coupling from gate or base of a first input transistor to source or emitter of a second input transistor, and a second capacitive cross coupling from gate or base of the second input transistor to source or emitter of the first input transistor;
- and
- the switched degeneration capacitor networks, comprising at least one capacitive degeneration circuit operatively connected to the source or emitter of the first input transistor and the source or emitter of the second input transistor.
A computer-readable medium storing a computer program comprising program instructions that, when executed by a processor of a radio receiver, causes the radio receiver to control an input impedance of the amplifier with respect to external circuitry connected to an input of the amplifier, based on controlling the capacitances of at least one of:
- a switched cross-coupling capacitor network, comprising a first capacitive cross coupling from gate or base of a first input transistor to source or emitter of a second input transistor, and a second capacitive cross coupling from gate or base of the second input transistor to source or emitter of the first input transistor;
- and
- a switched degeneration capacitor network, comprising at least one capacitive degeneration circuit operatively connected to the source or emitter of the first input transistor and the source or emitter of the second input transistor.
Dependencies are inferred from the claim text.