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Signal-transmission-circuit-of-a-wireless-telephone-handset

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Details

Inventors: Tsao, Kuan-Liang;
Assignee: Acer Peripherals, Inc. (Taoyuan, TW)
Primary Examiner: Chang; Vivian
Assistant Examiner: Lee; John J
Attorney, Agent or Firm:

The invention relates to a signal transmission circuit of a wireless telephone handset for reducing power consumption. The signal transmission circuit comprises a voice transformation circuit for transforming a user's voice into a voice signal, a voice modulator electrically connected to the voice transformation circuit for modulating the voice signal and transforming it into a radio frequency signal, a power amplifier electrically connected to the voice modulator for amplifying the radio frequency signal, a first switch electrically connected to the power amplifier for turning the power amplifier on and off, an antenna for transmitting the radio frequency signal outputted from the power amplifier, and a control circuit for controlling operations of the telephone handset. When the telephone handset is transmitting the radio frequency signal using the antenna, the control circuit turns on the power amplifier by using the first switch so that the radio frequency signal generated by the voice modulator can be amplified by the power amplifier before being transmitted through the antenna. When the telephone handset is receiving a radio frequency signal, the control circuit turns off the power amplifier by using the first switch to reduce power consumption.

DETAILED DESCRIPTION It is therefore a primary objective of the present invention to provide a signal transmission circuit of a wireless telephone handset for reducing power consumption and improving the sensitivity of the handset.
Briefly, in a preferred embodiment, the present invention provides a signal transmission circuit of a wireless telephone handset comprising: a voice transformation circuit for transforming a user's voice into a voice signal; a voice modulator electrically connected to the voice transformation circuit for modulating the voice signal and transforming it into a radio frequency signal; a power amplifier electrically connected to the voice modulator for amplifying the radio frequency signal; a first switch electrically connected to the power amplifier for turning the power amplifier on and off; an antenna for transmitting the radio frequency signal outputted from the power amplifier; and a control circuit for controlling operations of the telephone handset; wherein when the telephone handset is transmitting the radio frequency signal using the antenna, the control circuit turns on the power amplifier by using the first switch so that the radio frequency signal generated by the voice modulator can be amplified by the power amplifier and then be transmitted through the antenna, and when the telephone handset is receiving a radio frequency signal, the control circuit turns off the power amplifier by using the first switch to reduce power consumption.
It is an advantage of the present invention that when the handset is receiving a radio frequency signal, the control circuit uses the first switch to turn off the power amplifier and the second switch to prevent interference.
Therefore, the power consumption of the handset using the signal transmission circuit is reduced and the sensitivity of the handset is enhanced.
These and other objects and the advantages of the present invention will no doubt become obvious to those of ordinary skill in the art after having read the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings

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