§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
EP0407135A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Apparatus for controlling transmission output level for burst signal

Assignee: Panasonic Holdings Corp
•
Filing: 1990-07-03
•
Granted: —
•
Expires: 2010-07-03
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract An apparatus for controlling a transmission output level for a burst signal which is used in a communication of the TDMA system in which a transmission output level can be arbitrarily set. The apparatus comprises a variable gain amplifier (12) whose gain can be varied by a control voltage which is inputted to a control terminal; a variable gain amplifier (13) whose gain can be varied by a control voltage which is inputted to a control terminal; a detecting circuit (14) in which the variable gain amplifiers and are cascade connected to an input terminal to which a signal of a predetermined amplitude is inputted and to which an output electric power of the amplifier at the post stage is inputted and which extracts and detects a part of a voltage which is proportional to the output electric power; an attenuator (17) which receives the voltage detected by the detecting circuit and can output at an arbitrary attenuation ratio; a reference waveform generating apparatus (16) for outputting an envelope for a burst signal; a comparison amplifier (19) which amplifies a difference voltage between an output voltage of the attenuator and an output voltage of the reference waveform generating apparatus and whose output is connected to the control terminal of the variable gain amplifier (12); a control unit for controlling the control voltage of the variable gain amplifier (13) and the atte­nuation ratio of the attenuator; and an output terminal for outputting a burst waveform from the detecting circuit. By changing the attenuation ratio of the attenuator by the control unit and also simultaneously changing the control voltage of the control terminal, the burst signal output level can be varied without changing the output waveform of the reference waveform generating apparatus.

Inventors

  • 👤 Takeyuki Shofuryo Seumatsu
  • 👤 Yoshio Horiike
  • 👤 Hiroaki Kosugi

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-02 01:36
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036; H03G3/3042; H03G3/3047

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 292 words
An apparatus for controlling a transmission output level for a burst signal, comprising: a variable gain amplifier (12) whose grain can be varied by a control voltage (1) which is inputted to a control terminal 1; a variable gain amplifier (13) whose gain can be varied by a control voltage (2) which is inputted to a control terminal 2; a detecting circuit (14) in which the variable gain amplifiers (12) and (13) are cascade connected to an input terminal to which a signal of a predetermined amplitude is inputted and to which an output electric power of the amplifier at the post stage is inputted and which extracts and detects a part of a voltage which is proportional to said output electric power; an attenuator (17) which receives the voltage detected by the detecting circuit and can output at an arbitrary attenuation ratio; a reference waveform generating device (16) for outputting an envelope for a burst signal; a comparison amplifier (19) which amplifies a difference voltage between an output voltage of the attenuator and an output voltage of the reference waveform generating apparatus and whose output is connected to the control terminal 1 of the variable gain amplifier (12); a control unit (18) for executing a control of the control voltage (2) of the variable gain amplifier (13) and a control of the attenuation ratio of the attenuator; and an output terminal of outputting a burst waveform from the detecting circuit, wherein the attenuation ratio of the attenuator is changed by the control unit and the control voltage (2) is also simultaneously changed and a transmission output level of the burst signal of the variable gain amplifier (13) can be varied without changing an output waveform of the reference waveform generating apparatus.
Claim 2
Independent Claim 292 words
An apparatus for controlling a transmission output level for a burst signal, comprising: a variable gain amplifier (12) whose grain can be varied by a control voltage (1) which is inputted to a control terminal 1; a variable gain amplifier (13) whose gain can be varied by a control voltage (2) which is inputted to a control terminal 2; a detecting circuit (14) in which the variable gain amplifiers (12) and (13) are cascade connected to an input terminal to which a signal of a predetermined amplitude is inputted and to which an output electric power of the amplifier at the post stage is inputted and which extracts and detects a part of a voltage which is proportional to said output electric power; an attenuator (17) which receives the voltage detected by the detecting circuit and can output at an arbitrary attenuation ratio; a reference waveform generating device (16) for outputting an envelope for a burst signal; a comparison amplifier (19) which amplifies a difference voltage between an output voltage of the attenuator and an output voltage of the reference waveform generating apparatus and whose output is connected to the control terminal 1 of the variable gain amplifier (12); a control unit (18) for executing a control of the control voltage (2) of the variable gain amplifier (13) and a control of the attenuation ratio of the attenuator; and an output terminal of outputting a burst waveform from the detecting circuit, wherein the attenuation ratio of the attenuator is changed by the control unit and the control voltage (2) is also simultaneously changed and a transmission output level of the burst signal of the variable gain amplifier (13) can be varied without changing an output waveform of the reference waveform generating apparatus.
Claim 3
Dependent Claim 86 words
An apparatus according to claim 1, wherein a D/A converter having a reference input terminal is used for said attenuator and the voltage detected by the detecting circuit is inputted to the reference signal input terminal of the D/A converter and an analog signal output terminal of the D/A converter is connected to one input terminal of the comparison amplifier, and in this construction, by operating a signal which is given to a digital signal input terminal of the D/A converter, the attenuation ratio is set.
Claim 4
Dependent Claim 103 words
An apparatus according to claim 1, wherein a D/A converter and an ROM are used in the control unit accord­ing to claim 1, an output of the D/A converter is connect­ed to the control terminal of the variable gain amplifier (2) according to claim 1, an ROM 1 is connected to a digital input terminal of the D/A converter, the control voltage of the variable gain amplifier (13) according to claim 1 is controlled from a controller and, further, an ROM 2 is connected to the digital input terminal of the D/A converter according to claim 2 and the attenuation ratio is set.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag