EP0639901A2
Expired / Lapsed
EP
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Radio communication apparatus with circuit for field strength determination
Assignee: Hitachi Microcomputer System Ltd
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Filing: 1994-08-18
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Granted: —
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Expires: 2014-08-18
Abstract
Abstract Part of a first signal path (100) for amplifying a signal includes circuits (33b, 34b) for detecting a signal, and a second signal path (200) connected to an input portion of the first signal path includes circuits (61b, 62b) for detecting the signal. A signal strength detector circuit (5) adds outputs from the respective detector circuits in the first and second signal paths. The first signal path has a function of expanding the dynamic range in a smaller signal region as compared with the second signal path, while the second signal path has a function of expanding the dynamic range in a larger signal region as compared with the first signal path. When a radio transmitted output is variably controlled in a radio transmitter section (TX) based on a field strength detection output for a received signal, the transmitted output is optimized, resulting in minimizing consumed power and unnecessary radiation of radio waves. <IMAGE>
Inventors
- 👤 Hiroshi Hagisawa
- 👤 Kazuo Watanabe
- 👤 Kyoichi Takahashi
- 👤 Kenji Takahashi
- 👤 Michio Waki
- 👤 Tadashi Matsuoka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 13:25
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/06; H04W52/08; H04W52/18; H04W52/24; H04W52/245; H04W52/52
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
126 words
A radio communication apparatus comprising: a first signal path (100) including at least one first amplifier for amplifying a signal, at least one second amplifier for amplifying an output of said at least one first amplifier, and at least one first detector (33b, 34b) for detecting said amplified signal; a second signal path (200) connected to an input portion of said first signal path including at least one third amplifier for amplifying said signal, and at least one second detector (61b, 62b) for detecting said amplified signal output from said third amplifier; and a signal strength detector circuit (5) connected to said first and second signal paths for adding said detected signal of said first detector circuit and said detected signal of said second detector circuit.
Claim 2
Dependent Claim
58 words
A radio communication apparatus according to claim 1, wherein said first signal path has a function of expanding a dynamic range in a smaller signal region as compared with said second signal path, and said second signal path has a function of expanding the dynamic range in a larger signal region as compared with said first signal path.
Claim 3
Dependent Claim
167 words
A radio communication apparatus according to claim 2, wherein: said at least one first amplifier (31, 32) includes a pair of transistors having emitters and collectors, respectively; collector resistors connected to the collectors of said respective transistors; and a current source connected to said emitters, said first amplifiers being connected to perform differential operateion; said at least one second amplifier (33,34) includes a pair of transistors having collectors and emitters, respectively; collector resistors connected to the collectors of said respective transistors; emitter resistors connected to the emitters of said respective transistors; and a current source connected to said emitter resistors, said second amplifier being connected to perform differential operation; and said at least one third amplifier (61, 62) includes a pair of transistors having cololectors and emitters, respectively; collector resistors connected to the collectors of said respective transistors; emitter resistors connected to the emitters of said respective transistors; and a current source (Q17) connected to the emitter resistors, said third amplifier being connected to perform differential operation.
Claim 4
Dependent Claim
53 words
A radio communication apparatus according to claim 2, wherein: amplified outputs of said second amplifier (33, 34) in said first signal path (100) is connected through resistors (R18, R19) to the input portions of said at least one first amplifier (31, 32) in said first signal path to form a negative feedback circuit.
Claim 5
Dependent Claim
28 words
A radio communication apparatus according to claim 3, further comprising an attenuator (13) connected to an input portion of said second signal path (200) for attenuating said signal.
Claim 6
Dependent Claim
58 words
A radio communication apparatus according to claim 2, further comprising: a transmission control circuit (83) connected to the output of said signal strength detector circuit (5) for providing a signal for adjusting a signal transmission output; and a transmitter (TX) connected to said transmission control circuit for adjusting the signal transmission output in response to said adjusting signal.
Claim 7
Dependent Claim
50 words
A radio communication apparatus according to claim 2, further comprising: an FET circuit (2) connected to the input portion of said first signal path (100) for frequency modulating said signal; and a demodulator circuit (4) connected to an output portion of said first signal path for demodulating a detected signal.
Claim 8
Dependent Claim
25 words
An apparatus according to claim 1, further comprising a connection portion (51) for wired-connecting outputs from said first and second detector circuits with each other.
Claim 9
Dependent Claim
48 words
An apparatus according to claim 1, further comprising: an FET circuit (2) connected to the input portion of said first signal path (100) for frequency modulating said signal; and a demodulator circuit (4) connected to an output portion of said first signal path for demodulating a detected signal.
Claim 10
Dependent Claim
184 words
An apparatus according to claim 9, wherein: said second plurality of amplifiers (33, 34) each includes a pair of transistors; collector resistors connected to the collectors of said respective transistors in the pair; emitter resistors connected to the emitters of said respective transistors in the pair; and a current source connected to said emitter resistors, said each amplifier being connected to perform differential operate; said third plurality of amplifiers (61, 62) each includes a pair of transistors (Q8, Q9); collector resistors (R7, R8) connected to the collectors of said respective transistors in the pair; emitter resistors (R9, R10) connected to the emitters of said respective transistors in the pair; and a current source (Q10) connected to said emitter resistors, said each amplifier being connected to perform differential operation; and said third plurality of amplifiers (61, 62) each includes a pair of transistors (Q15, Q16); collector resistors (R7, R8) connected to the collectors of said respective transistors in the pair; and a current source (Q17) connected to the emitters of said respective transistors in the pair, said each amplifier being connected to perform differential operation.
Claim 11
Dependent Claim
26 words
An apparatus according to claim 10, further comprising an attenuator (13) connected to an input portion of said second signal path (200) for attenuating said signal.
Claim 12
Dependent Claim
114 words
A radio communication apparatus comprising: a first signal path (100) for amplifying and detecting a received signal and transferring said received signal to a demodulator (4); a second signal path (200) for amplifying and detecting said received signal separately from said first signal path; and a signal strength detector circuit (5) for detecting the field strength of said received signal from a detection signal extracted from said first signal path and a detection signal extracted from said second signal path, wherein said first signal path is composed of circuits which expand a dynamic range in a lower region, while said second signal path is composed of circuits which give priority to wider dynamic range.
Claim 13
Dependent Claim
24 words
A radio communication apparatus according to claim 12, wherein said second signal path (200) includes an attenuator (13) arranged at the input side thereof.
Claim 14
Dependent Claim
56 words
A radio communication apparatus comprising: a radio receiver section (RX); a radio transmitter section (TX); a signal strength detector circuit (5) for detecting the field strength of a received signal; and control means (83) for variably controlling a radio transmitted output in said radio transmitter section based on an output of said signal strength detector circuit.
Claim 15
Dependent Claim
122 words
A radio communication apparatus according to claim 14, further comprising: a first signal path (100) for amplifying, detecting, and transferring a radio received signal from an antenna (1); a demodulator (4) for demodulating the received signal with an output transferred from said first signal path; a second signal path (200) for amplifying, detecting, and transferring said radio received signal separately from said first signal path; a signal strength detector circuit (5) for detecting the field strength of said radio received signal from a detection signal extracted from said first signal path and a detection output extracted from said second signal path; and control means (83) for variably controlling a radio transmitted output based on an output of said signal strength detector circuit.
Claim 16
Dependent Claim
47 words
A radio communication apparatus according to claim 14, wherein said first signal path (100) is composed of circuits (31 - 35) which give priority to lower noise figure, and said second signal path (200) is composed of circuits (61, 62) which give priority to wider dynamic range.
Claim 17
Dependent Claim
90 words
A radio communication apparatus according to claim 14, further comprising: A/D convertor means (52) for separately converting a first detection signal extracted from said first signal path (100) and a second detection signal extracted from said second signal path (200) to digital signals; and control means (83) for performing digital processing on a received signal strength based on said digitally converted first detection signal and second detection signal and for performing an optimal control for a radio transmitted output based on the received signal strength produced by said digital processing.
Claim 18
Dependent Claim
66 words
A radio communication apparatus according to claim 14, further comprising: an attenuator (13) for attenuating an input level of a radio received signal from an antenna (1); switching means (14) for removably inserting said attenuator between said antenna and said first and second signal paths (100, 200); and control means (83) for controlling switching operations of said switching means based on a signal strength detection output.
Claim 19
Dependent Claim
27 words
A radio communication apparatus according to claim 14, further comprising control means (83) for controlling selection of a radio zone based on a detected received field strength.
References Cited (Backward Citations)
No citation records indexed.
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