Radio telephone apparatus
AssigneeNEC Corporation
InventorMitsuru Tanaka
Life of this patent
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Abstract
A voltage control variable attenuator takes a structure using a feedback loop which allows a signal modulated by a modulator to be attenuated based on a comparison result from a comparator. A power amplifier outputs the signal inputted thereto from the voltage control variable attenuator without amplifying the signal when no control signal is outputted from a control section, and amplifies a power of the signal inputted thereto from the voltage control variable attenuator to output it when the control signal is outputted from the control section. In a detection circuit, a change-over switch is provided which switches a detection voltage to be detected, depending on whether or not the control signal is outputted from the control section.
Claims10
A transmitting apparatus having a power-saving control, said apparatus comprising:
- a controller providing a power-saving control signal;
- a modulator providing a modulated output signal to be transmitted;
- an amplifier receiving said power-saving control signal and said modulator output signal, such that said modulated output signal to be transmitted is amplified if said power-saving control signal is in a first state and said modulated output signal to be transmitted is directly connected to an antenna conductor and not amplified if said power-saving control signal is in a second state;
- and
- a detector coupled to said antenna conductor, said detector having a switchable sensitivity and providing an input to control said controller.
A transmitting apparatus having a power-saving control, said apparatus comprising:
- a controller providing a power-saving control signal;
- a modulator providing a modulated output signal to be transmitted;
- an amplifier receiving said power-saving control signal and said modulator output signal, such that said modulated output signal to be transmitted is amplified if said power-saving control signal is in a first state and said modulated output signal to be transmitted is directly connected to an antenna conductor and not amplified if said power-saving control signal is in a second state;
- a voltage controlled variable attenuator, controlled by said power-saving control signal, and receiving said modulated output signal as an input signal and providing an attenuated output signal into said amplifier;
- and
- a reference voltage generator, controlled by said power-saving control signal, and providing an output signal to control said voltage controlled variable attenuator.
A method of enlarging a dynamic range of a transmitting apparatus having a power-saving mode and including an attenuator outputting an attenuated modulated output signal to be transmitted and an amplifier receiving said attenuated output signal, said method comprising:
- controlling said amplifier by a signal representing said power-saving mode such that said modulated output signal is amplified at a predetermined lower amplification if said power-saving mode is activated, and said modulated output signal is amplified at a predetermined higher amplification if said power-saving mode is not activated;
- and
- controlling said attenuator with a feedback loop that differs based upon whether said power-saving mode is activated, thereby enlarging said dynamic range.
Dependencies are inferred from the claim text.