Linear pre-amplifier for radio-frequency power amplifier
AssigneeSTMicroelectronics S.r.l.
InventorsJean-Charles Grasset, Christophe Pinatel
Life of this patent
Estimating the term…
Abstract
An amplifier including an input circuit tuned to the frequency to be amplified and receiving as an input the signal to be amplified, a first transistor connected in common base, the emitter of which is coupled to the input circuit and the collector of which provides the output signal of the amplifier, and a feedback circuit feeding back to the base of the transistor a fraction of the output voltage. The feedback circuit includes a capacitive bridge and a second transistor. The input circuit can be used in a first stage of the amplifier or of a mixer.
Claims30
An amplifier including:
- an input circuit tuned to a frequency to be amplified and receiving, as an input, a signal to be amplified,
- a first transistor connected in common base, an emitter of which is coupled to the input circuit and a collector of which provides an output signal of the amplifier, and
- a feedback circuit feeding back to the base of said transistor a fraction of the output voltage, wherein the feedback circuit is formed by a capacitive bridge formed of a first capacitor coupled between an amplifier output and the base of the first transistor, and of a second capacitor connected in series with the first capacitor and coupled between the base of the first transistor and a virtual ground node.
An amplifier comprising:
- a first transistor connected in a common base configuration, an emitter of which receives an input signal and a collector of which provides an output signal of the amplifier;
- and
- a feedback circuit for coupling to a base of the first transistor a fraction of the output signal, wherein the feedback circuit comprises a first capacitor and a second capacitor coupled in series between the collector of the first transistor and a virtual around node, wherein the fraction of the output signal is coupled from a connection node of the first and second capacitors to the base of the first transistor.
An amplifier comprising:
- an impedance matching circuit tuned to a frequency to be amplified and having an input and an output;
- a first transistor connected in a common base configuration, an emitter of which is coupled to an output of said matching circuit and a collector of which provides an output signal of the amplifier;
- an input stage including an input receiving an input signal and an output coupled to the input of the matching circuit;
- and
- a feedback circuit for coupling to the base of said first transistor a fraction of the output signal, wherein the feedback circuit comprises a first capacitor and a second capacitor coupled in series between the collector of the first transistor and a virtual ground node, wherein the fraction of the output signal is coupled from a connection node of the first and second capacitors to the base of the first transistor.
Dependencies are inferred from the claim text.