RF gain enhancement for cellular telephone
First Claim
Patent Images
1. A portable radio telephone with enhanced gain control comprising:
- a) an RF transmitter adapted to provide an RF signal;
b) internal amplifier circuitry having variable gain for providing variable power amplification of the RF signal to produce an output RF signal;
c) an internal antenna coupled to said internal amplifier circuitry and adapted to transmit the output RF signal;
d) an interface adapted to couple said telephone to an external antenna to transmit the output RF signal from the external antenna when said interface is coupled to said external antenna;
e) means for generating a first signal representative of the presence of an external power source, a second signal representative of a request for hands-free operation of said telephone, and a third signal representative of the presence of an external microphone and speaker; and
f) logic circuitry coupled to said internal amplifier circuitry for controlling the variable gain of said internal amplifier circuitry, said logic circuit being operative to increase the gain of said internal amplifier circuitry from a first gain level to a second gain level within the same power class rating only when said first, second and third signals are simultaneously present.
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Abstract
A portable RF telephone for use in a vehicle may be coupled to an external antenna to overcome the shielding effects of the metallic enclosure of the automobile. While coupled to the external antenna, the portable RF telephone increases the amount of power used to transmit an RF signal. Preferably, the transmit power increases to a maximum level allowed within a defined power classification. Increasing the transmit power overcomes cabling and connector losses associated with using an external antenna and further increases the effective transmitting power without exceeding power levels defined by the telephones power classification.
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Citations
18 Claims
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1. A portable radio telephone with enhanced gain control comprising:
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a) an RF transmitter adapted to provide an RF signal; b) internal amplifier circuitry having variable gain for providing variable power amplification of the RF signal to produce an output RF signal; c) an internal antenna coupled to said internal amplifier circuitry and adapted to transmit the output RF signal; d) an interface adapted to couple said telephone to an external antenna to transmit the output RF signal from the external antenna when said interface is coupled to said external antenna; e) means for generating a first signal representative of the presence of an external power source, a second signal representative of a request for hands-free operation of said telephone, and a third signal representative of the presence of an external microphone and speaker; and f) logic circuitry coupled to said internal amplifier circuitry for controlling the variable gain of said internal amplifier circuitry, said logic circuit being operative to increase the gain of said internal amplifier circuitry from a first gain level to a second gain level within the same power class rating only when said first, second and third signals are simultaneously present. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A portable radio communications device with enhanced gain control, comprising:
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a) a hand-held unit including an RF transmitter for providing an RF signal, an internal amplifier circuit having a variable gain for providing variable power amplification of the RF signal to produce an output RF signal, an antenna coupled to said internal amplifier circuit for transmitting said output RF signal, and a receiver coupled to said antenna for receiving a transmitted RF signal from a remote station; b) a cradle unit coupled to an external power source for engaging and holding said hand-held unit, said cradle unit including an interface for a hands-free kit including a microphone and speaker; c) means for generating a first signal representative of the presence of an external power source, a second signal representative of a request for hands-free operation of said telephone, and a third signal representative of the presence of an external microphone and speaker; and d) a logic circuit coupled to said internal amplifier circuit in said hand-held unit for controlling the gain of said internal amplifier circuit, said logic circuit being operative to increase the gain of said internal amplifier circuit to increase the power level of the output RF signal from a first level to a second level within the same power class rating, only when said first, second and third signals are simultaneously present. - View Dependent Claims (17, 18)
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Specification