Radio-frequency power amplifier of mobile communication equipment

Claim 2

A radio-frequency power amplifier of mobile communication equipment, comprising: an input stage including at least one differential amplifier arranged to balanced-input and amplify a radio-frequency signal delivered from a frequency converter section of a transmission system of the mobile communication equipment located downstream of a modulator section of the transmission system; and a bias current circuit for supplying said at least one differential amplifier with a bias current varying in dependence on a gain control signal, to thereby variably set a gain of said at least one differential amplifier, said radio-frequency power amplifier being mounted on a circuit board of the mobile communication equipment, said circuit board being formed with a radio-frequency grounding pattern, wherein said input stage of said radio-frequency power amplifier amplifies the radio-frequency signal under a floating condition with respect to the radio-frequency grounding pattern.

Claim 3

The radio-frequency power amplifier according to claim 1 , wherein said input stage of said radio-frequency power amplifier is comprised of a plurality of differential amplifiers which are direct-coupled to one another, and said bias current circuit is provided for each of said plurality of differential amplifiers.

Claim 4

The radio-frequency power amplifier according to claim 1 , wherein the gain control signal is a signal which is transmitted from a base station or a control section of the mobile communication equipment in order to determine a transmission output level of the mobile communication equipment.

Claim 5

The radio-frequency power amplifier according to claim 1 , wherein said radio-frequency power amplifier is mounted on the circuit board together with the modulator and frequency converter sections and a receiver system of the mobile communication equipment to thereby constitute a radio-frequency module which serves as a radio-frequency section of the mobile communication equipment.

Claim 6

The radio-frequency power amplifier according to claim 4 , wherein said radio-frequency power amplifier is configured in a form of an integrated circuit.

Claim 7

The radio-frequency power amplifier according to claim 4 , wherein said radio-frequency power amplifier is mounted on portable mobile communication equipment.

Claim 8

A radio-frequency power amplifier of mobile communication equipment, comprising: an output stage including a push-pull circuit arranged to amplify and balanced-output a radio-frequency signal received through an input stage of said amplifier from a frequency converter section of a transmission system of the mobile communication equipment located downstream of a modulator section of the transmission system; and a bias current circuit for supplying said push-pull circuit with a bias current varying in dependence on a gain control signal, said radio-frequency power amplifier being mounted on a circuit board of the mobile communication equipment, said circuit board being formed with a radio-frequency grounding pattern, wherein said output stage of the radio-frequency power amplifier amplifies the radio-frequency signal under a floating condition with respect to the radio-frequency grounding pattern.

Claim 9

A radio-frequency power amplifier of mobile communication equipment, comprising: an output stage including a push-pull circuit arranged to amplify and balanced-output a radio-frequency signal received through an input stage of said amplifier from a frequency converter section of a transmission system of the mobile communication equipment located downstream of a modulator section of the transmission system; and a bias current circuit for supplying said push-pull circuit with a bias current varying in dependence on a gain control signal, said radio-frequency power amplifier being mounted on a circuit board of the mobile communication equipment, said circuit board being formed with a radio-frequency grounding pattern, wherein said output stage of the radio-frequency power amplifier amplifies the radio-frequency signal under a floating condition with respect to the radio-frequency grounding pattern.

Claim 10

The radio-frequency power amplifier according to claim 7 , wherein said bias current circuit varies an operating current of a constant current circuit connected with bases of a pair of transistors which form said push-pull circuit, to thereby vary the bias current applied to said push-pull circuit.

Claim 11

The radio-frequency power amplifier according to claim 7 , wherein the gain control signal is a signal which is transmitted from a base station or a control section of the mobile communication equipment in order to determine a transmission output level of the mobile communication equipment.

Claim 12

The radio-frequency power amplifier according to claim 7 , wherein said radio-frequency power amplifier is mounted on the circuit board together with the modulator and frequency converter sections and a receiver system of the mobile communication equipment to thereby constitute a radio-frequency module which serves as a radio-frequency section of the mobile communication equipment.

Claim 13

The radio-frequency power amplifier according to claim 10 , wherein said radio-frequency power amplifier is configured in a form of an integrated circuit.

Claim 14

The radio-frequency power amplifier according to claim 10 , wherein said radio-frequency power amplifier is mounted on portable mobile communication equipment.

Claim 15

A radio-frequency power amplifier of mobile communication equipment, comprising: an input stage including at least one differential amplifier arranged to balanced-input and amplify a radio-frequency signal delivered from a frequency converter section of a transmission system of the mobile communication equipment located downstream of a modulator section of the transmission system; a first bias current circuit for supplying said at least one differential amplifier with a bias current varying in dependence on a gain control signal, to thereby variably set a gain of said at least one differential amplifier; an output stage including a push-pull circuit arranged to receive the radio-frequency signal amplified in and delivered from said input stage and to amplify and balanced-output the amplified radio-frequency signal; and a second bias current circuit for supplying said push-pull circuit with a bias current varying in dependence on the gain control signal, said radio-frequency power amplifier being mounted on a circuit board of the mobile communication equipment, said circuit board being formed with a radio-frequency grounding pattern, wherein said input stage and said output stage of said radio-frequency power amplifier amplifies the radio-frequency signal and amplified radio-frequency signal, respectively, under a floating condition with respect to the radio-frequency grounding pattern.

Claim 16

A radio-frequency power amplifier of mobile communication equipment, comprising: an input stage including at least one differential amplifier arranged to balanced-input and amplify a radio-frequency signal delivered from a frequency converter section of a transmission system of the mobile communication equipment located downstream of a modulator section of the transmission system; a first bias current circuit for supplying said at least one differential amplifier with a bias current varying in dependence on a gain control signal, to thereby variably set a gain of said at least one differential amplifier; an output stage including a push-pull circuit arranged to receive the radio-frequency signal amplified in and delivered from said input stage and to amplify and balanced-output the amplified radio-frequency signal; and a second bias current circuit for supplying said push-pull circuit with a bias current varying in dependence on the gain control signal, said radio-frequency power amplifier being mounted on a circuit board of the mobile communication equipment, said circuit board being formed with a radio-frequency grounding pattern, wherein said input stage and said output stage of said radio-frequency power amplifier amplifies the radio-frequency signal and amplified radio-frequency signal, respectively, under a floating condition with respect to the radio-frequency grounding pattern.

Claim 17

The radio-frequency power amplifier according to claim 13 , wherein said input stage of said radio-frequency power amplifier is comprised of a plurality of differential amplifiers which are direct-coupled to one another, and said bias current circuit is provided for each of said plurality of differential amplifiers.

Claim 18

The radio-frequency power amplifier according to claim 13 , wherein said second bias current circuit varies an operating current of a constant current circuit connected with bases of a pair of transistors which form said push-pull circuit, to thereby vary the bias current applied to said push-pull circuit.

Claim 19

The radio-frequency power amplifier according to claim 13 , wherein the gain control signal is a signal which is transmitted from a base station or a control section of the mobile communication equipment in order to determine a transmission output level of the mobile communication equipment.

Claim 20

The radio-frequency power amplifier according to claim 13 , wherein said radio-frequency power amplifier is mounted on the circuit board together with the modulator and frequency converter sections and a receiver system of the mobile communication equipment to thereby constitute a radio-frequency module which serves as a radio-frequency section of the mobile communication equipment.

Claim 21

The radio-frequency power amplifier according to claim 17 , wherein said radio-frequency power amplifier is configured in a form of an integrated circuit.

Claim 22

The radio-frequency power amplifier according to claim 17 , wherein said radio-frequency power amplifier is mounted on portable mobile communication equipment.