JPS6451828A - Receiver - Google Patents
ReceiverInfo
- Publication number
- JPS6451828A JPS6451828A JP20969587A JP20969587A JPS6451828A JP S6451828 A JPS6451828 A JP S6451828A JP 20969587 A JP20969587 A JP 20969587A JP 20969587 A JP20969587 A JP 20969587A JP S6451828 A JPS6451828 A JP S6451828A
- Authority
- JP
- Japan
- Prior art keywords
- variable attenuator
- intermediate frequency
- level
- given
- output signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Superheterodyne Receivers (AREA)
- Noise Elimination (AREA)
Abstract
PURPOSE:To widen the dynamic range by applying low noise amplification to a signal after frequency conversion and giving the result to a variable attenuator so as to attain inexpensive constitution and improving the noise coefficient. CONSTITUTION:An intermediate wave output signal of a frequency converter 3 is amplified by a low noise amplifier 9, given to a variable attenuator 2A of an intermediate frequency band, an output signal of the variable attenuator 2A is amplified by an intermediate frequency amplifier 10 and given to an AGC amplifier 6 via a band pass filter 11. The output signal of the variable attenuator 2A is given to a level detector 4 and a control circuit 5 controls the attenuation of the variable attenuator 2A bused on the level detected by the detector 4. Thus, an inexpensive variable attenuator operated at the intermediate frequency band is employed and since the level is controlled after low noise amplification, the effect of the insertion loss of the variable attenuator onto the noise coefficient is reduced and the level is controlled at the pre-stage of the intermediate frequency, then the dynamic range is widened.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20969587A JPS6451828A (en) | 1987-08-24 | 1987-08-24 | Receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20969587A JPS6451828A (en) | 1987-08-24 | 1987-08-24 | Receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6451828A true JPS6451828A (en) | 1989-02-28 |
Family
ID=16577104
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20969587A Pending JPS6451828A (en) | 1987-08-24 | 1987-08-24 | Receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6451828A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0455837U (en) * | 1990-09-20 | 1992-05-13 | ||
CN103178798A (en) * | 2011-12-21 | 2013-06-26 | 北京普源精电科技有限公司 | Radio frequency signal source |
-
1987
- 1987-08-24 JP JP20969587A patent/JPS6451828A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0455837U (en) * | 1990-09-20 | 1992-05-13 | ||
CN103178798A (en) * | 2011-12-21 | 2013-06-26 | 北京普源精电科技有限公司 | Radio frequency signal source |
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