Title:
TRANSMISSION POWER CONTROL CIRCUIT
Document Type and Number:
Japanese Patent JP3240998
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent transmission power from becoming excessive in a mobile communication terminal to which precise transmission power control is required.
SOLUTION: A branching filter 11, a detection circuit 12 and a smoothing circuit 18 generate detection voltage corresponding to the average transmission power of a mobile communication terminal. A threshold setting circuit 14 generates threshold voltage corresponding to permitted maximum average transmission power. A voltage comparator 15 compares detection voltage with threshold voltage and judges whether average transmission power is larger than or smaller than maximum average transmission power. A control circuit 16 changes control voltage so that the gain of a variable gain amplifier 4 is reduced when the voltage comparator 15 judges that average transmission power is larger than maximum average transmission power.
Inventors:
Masataka Ichihara
Application Number:
JP21085698A
Publication Date:
December 25, 2001
Filing Date:
July 27, 1998
Export Citation:
Assignee:
NEC
International Classes:
H04B1/04; H04B1/40; H04B7/005; H04B7/26; H04W52/04; H04W52/52; (IPC1-7): H04B7/26; H04B1/04
Domestic Patent References:
| JP8510614A |
Attorney, Agent or Firm:
Masaki Yamakawa
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