Car-mounted type booster system for hand-held phone

• US 5,109,541 A
• Filed: 11/16/1990
• Issued: 04/28/1992
• Est. Priority Date: 11/29/1989
• Status: Expired due to Term

• Current Assignee: Hyundai Curitel ,inc
• Original Assignee: Hyundai Electronics Industries Co. Ltd. (SK Hynix Inc.)
• Inventors: Park, Chan Hyun
• Primary Examiner(s): KUNTZ, CURTIS A
• Application Number:
  US07/614,449
• Time in Patent Office: 529 Days
• Field of Search: 455/89, 455/90, 455/127, 455/343, 455/234, 379/60, 379/61
• US Class Current: 455/571
• CPC Class Codes: H04B 1/3877 Arrangements for enabling portable transceivers to be used in a fixed position, e.g. cradles or boosters
• CPC Class Codes: H04B 1/52 Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa

Abstract

The present invention provides a car-mounted booster system comprising a first coupler, connected to the first duplexer and the power module, which regulates an output of the first duplexer; a first amplifier connected to the first coupler; an A/D converter connected to the first amplifier, which converts the analog output signal from the first amplifier to a predetermined digital code, and generates a transmission verification signal for verification of a fact whether the output signal from the first amplifier is a transmission signal or not; a second coupler connected to the second duplexer and the power module, which regulates an output of the second duplexer; a second amplifier connected to the second coupler; and a D/A converter connected to the A/D converter, the second amplifier, and the power module, which generates a control signal to control the power module according to a comparison result after comparison between a signal level from the second amplifier and a signal level from the A/D converter, and a power supply to the Power Module according to the transmission verification signal from the A/D converter.

Claims

1. In a car-mounted type booster system for hand-held phone comprising a first duplexer connected to the hand-held phone, a second duplexer connected to an external antenna, a low-noise amplifier compensating a loss due to an interconnection between the first duplexer and the second duplexer;

and a power module interconnecting the first duplexer and the second duplexer, which sends a signal from the first duplexer to the second duplexer after amplification, the booster system further comprising;

a first coupler, connected to the first duplexer and the power module, which regulates an output of the first duplexer;

a first amplifier connected to the first coupler;

an A/D converter connected to the first amplifier, which converts the analog output signal from the first amplifier to a predetermined digital code, and generates a transmission verification signal for verification of a fact whether the output signal from the first amplifier is a transmission signal or not;

a second coupler connected to the second duplexer and the power module, which regulates an output of the second duplexer;

a second amplifier connected to the second coupler; and

a D/A converter connected to the A/D converter, the second amplifier, and the power module, which generates a control signal to control the power module according to a comparison result after comparison between a signal level from the second amplifier and a signal level from the A/D converter, the D/A converter applying power supply to the power module according to the transmission verification signal from the A/D converter.

2. A booster system according to claim 1, the A/D converter comprising:

a first comparator comparing the output level from the first amplifier with a predetermined reference level;

a second comparator, comparing an output of the first comparator with a predetermined reference level, which generates the transmission verification signal;

logarithmic scale bar graph IC'"'"'s receiving the output from the first comparator, which code an input voltage level into a specific digital code; and

an encoder connected to the logarithmic scale bar graph IC'"'"'s.

3. In a car-mounted type booster system for hand-held phone comprising a first duplexer connected to the hand-held phone;

a second duplexer connected to an external antenna;

a low-noise amplifier interconnected between the first duplexer and the second duplexer, which compensates a loss due to the interconnection; and

a power module which sends a signal from the first duplexer to the second duplexer after power amplification, the booster system further comprising;

a first coupler connected to the first duplexer and the power module, which regulates an output of the first duplexer;

a first amplifier connected to the first coupler;

a second coupler connected to the second duplexer and the power module, which regulates an output of the power module;

a second amplifier connected to the second coupler; and

a power control means connected to the first amplifier, the second amplifier, and the power module which controls the power module according to a control signal, generated after a comparison between an output signal level from the first amplifier and an output signal level from the second amplifier, and applies power to the power module according to a transmission verification signal generated for verification that decides whether a signal from the first amplifier is a transmission signal or not after a comparison between a signal level from the first amplifier and a predetermined reference level.