Amplifier and portable telephone apparatus using the same

Details Amplifier and portable telephone apparatus using the same Amplifier and portable telephone apparatus using the same

1997-05-02

1999-09-28

Chin, Wellington

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551801, 455315, 455318, 455319, 330302, 330306, H04B 118

Patent

active

059603348

ABSTRACT:
An amplifier and a portable telephone apparatus using the same in which a resonance circuit is provided for each of different frequencies and bypass capacitors of the ground terminal of a transistor are properly switched according to the different frequencies. Two capacitors connected to each other in series for the parallel resonance circuits to be connected to the output terminal of the amplifying transistor are used for the resonance capacitors for the higher frequency. For the lower frequency, one of the tow capacitors that is on the ground side is used as a bypass capacitor that grounds the ground terminal of the transistor in a high frequency manner, the other capacitor being functioned as a resonance capacitor at that frequency.

REFERENCES:
patent: 4797638 (1989-01-01), Usui et al.

Affiliated with

Also associated with

Rating

Amplifier and portable telephone apparatus using the same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Amplifier and portable telephone apparatus using the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Amplifier and portable telephone apparatus using the same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-715512