Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Patent
1997-10-21
2000-02-29
Nguyen, Lee
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
4552341, 4552511, 4552531, 330149, 375345, H04B 110
Patent
active
060320311
ABSTRACT:
In a receiver used in radio communication, when two or more interfering waves having different frequencies exist (other than a received signal frequency), a deterioration of a receiving sensitivity by a cross modulation signal produced by a non-linearity of a high-linearity of a high-frequency amplifier and a frequency converter is eliminated. The received signal from an antenna and an antenna sharer is provided via a first variable gain amplifier and via a band pass filter to a frequency converter. A local oscillating signal is mixed with these signals and a signal in an intermediate frequency band is outputted via a band pass filter to a second variable gain amplifier having a gain which is controlled such that an input signal power level of a demodulator is constant. A gain control signal of the second variable gain amplifier is used as a gain quantity. The control circuit obtains a gain control quantity based on the control signal, and also a power quantity of the received signal from a gain increase/decrease in each block of the receiver. The signal from the second variable gain amplifier is demodulated by the demodulator, converted to a base band signal, and after A/D conversion, fed to an error ratio calculation unit. A gain quantity control unit controls the gain quantity of the first variable gain amplifier.
REFERENCES:
patent: 4013964 (1977-03-01), Skutta
patent: 4030035 (1977-06-01), Ienaka et al.
patent: 5050192 (1991-09-01), Nawata
patent: 5697081 (1997-12-01), Lyall et al.
Office Action Issued by the Japanese Patent Office on Jan. 13, 1999 in the Corresponding Japanese Application.
NEC Corporation
Nguyen Lee
LandOfFree
Receiver for suppressing intermodulation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Receiver for suppressing intermodulation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Receiver for suppressing intermodulation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-691398