EP0482502A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Power amplifier and mobile radio apparatus with the same
Assignee: Toshiba Corp
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Filing: 1991-10-16
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Granted: —
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Expires: 2011-10-16
Abstract
Abstract A power amplifier used in a mobile radio apparatus operated selectively in an analog mode and a digital mode comprises an amplifying circuit (33) for saturation-amplifying and linear-amplifying a speech signal and a switch (20) for selectively switching the amplifying circuit to a saturation amplification and a linear amplification in accordance with the analog mode and the digital mode. <IMAGE>
Inventors
- 👤 Tatsuya c/o Intellectual Prop. Division Yamada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 06:05
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/24; H04B7/26; H04L; H04L27/00; H04L27/0008; H03; H03F; H03F1/00; H03F1/02; H03F1/0205; H03F1/0261; H03F3/00; H03F3/20; H03F3/21; H03F3/211; H03F3/24; H03F3/245; H03F3/72; H04B1/00; H04B1/02; H04B1/04; H04B2001/0408
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
43 words
A power amplifier comprising: amplifying circuit means (33) for selectively saturation-amplifying and linear-amplifying an input signal; and means (10, 20) for switching said amplifying circuit means to perform a saturation amplification and a linear amplification in accordance with a plurality of operation modes.
Claim 2
Dependent Claim
77 words
An amplifier according to claim 1, characterized in that said amplifying circuit means is constituted by a plurality of transistor circuits (AMP1, AMP2 ... AMPn, 41-43) including a last stage transistor circuit (AMPn, 43), said last stage transistor circuit including a transistor (Tr) having a base connected to said switching means (20), and said switching means is means (20) for selectively applying a bias voltage to the base of said transistor in accordance with the operation modes.
Claim 3
Dependent Claim
42 words
An amplifier according to claim 1, characterized in that said amplifying circuit means includes signal attenuating means (D1, D2) for attenuating the input signal and for changing a signal attenuation amount of said signal attenuating means in accordance with the operation modes.
Claim 4
Dependent Claim
60 words
A power amplifier used in a mobile radio apparatus operated selectively in an analog mode and a digital mode, comprising: amplifying circuit means (33) for saturation-amplifying and linear-amplifying an input signal; and means (20) for switching said amplifying circuit means to selectively perform a saturation amplification and a linear amplification in accordance with the analog mode and the digital mode.
Claim 5
Dependent Claim
48 words
An amplifier according to claim 4, characterized in that said amplifying circuit means includes signal attenuating means (D1, D2) for attenuating the input signal and for setting signal attenuation amounts such that a signal attenuation amount of the saturation amplification is smaller than that of the linear amplification.
Claim 6
Dependent Claim
55 words
An amplifier according to claim 4, characterized in that said amplifying circuit means is constituted by a plurality of transistor circuits (AMP1, AMP2 ... AMPn, 41-43) for amplifying the input signal, and said switching means is constituted by means (20) for applying a base bias voltage (VB) to at least one of said transistor circuits.
Claim 7
Dependent Claim
29 words
An amplifier according to claim 6, characterized in that said switching means includes means (20) for applying the base bias voltage to a last one of said transistor circuits.
Claim 8
Dependent Claim
78 words
An amplifier according to claim 4, characterized in that said amplifying circuit means includes attenuating means (D1, D2) for attenuating the input signal and a transistor (Tr), having a base connected to said switching means (20), for receiving the input signal input through said attenuating means, and said switching means includes switching means (20), connected to a bias power source and closed in a digital mode, for applying a bias voltage to the base of said transistor (Tr).
Claim 9
Dependent Claim
89 words
A mobile radio apparatus comprising: a transmitter for transmitting a modulated signal to a base station; said transmitter including an analog modulator (31) for modulating an analog input signal, a digital modulator (32) for modulating a digital input signal, a power amplifier (33) for saturation-amplifying an analog-modulated carrier and lenear-amplifying a digital-modulated carrier, and means (20) for selecting a saturation amplification and a linear amplification in accordance with an analog mode and a digital mode; and a receiver (6, 7) for receiving a transmission signal from said base station.
Claim 10
Dependent Claim
58 words
An apparatus according to claim 9, characterized in that said power amplifier is constituted by amplifying circuit means (33) for saturation-amplifying and linear-amplifying the analog-modulated carrier and the digital-modulated carrier and means (20) for switching said amplifying circuit means to perform the saturation amplification and the linear amplification in accordance with the analog mode and the digital mode.
Claim 11
Dependent Claim
48 words
An apparatus according to claim 9, characterized in that said amplifying circuit means includes signal attenuating means (D1, D2) for attenuating the input signal and for setting signal attenuation amounts such that a signal attenuation amount of the saturation amplification is smaller than that of the linear amplification.
Claim 12
Dependent Claim
68 words
An apparatus according to claim 9, characterized in that said amplifying circuit means is constituted by a multistage amplifier having a plurality of transistor circuits (AMP1, AMP2 ... AMPn, 41-43) including a last stage transistor circuit, for amplifying the input signal, and said switching means is constituted by means (20) for applying a base bias voltage to at least one of said transistor circuits in the digital mode.
Claim 13
Dependent Claim
29 words
An apparatus according to claim 12, characterized in that said switching means includes means (20) for applying the base bias voltage to said last stage transistor circuit (AMPn, 43).
Claim 14
Dependent Claim
77 words
An amplifier according to claim 9, characterized in that said amplifying circuit means includes attenuating means (D1, D2) for attenuating the input signal and a transistor (Tr), having a base connected to said switching means (20), for receiving the input signal input through said attenuating means, and said switching means includes switching means (20), connected to a bias power source and closed in the digital mode, for applying the bias voltage to the base of said transistor.
References Cited (Backward Citations)
No citation records indexed.
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