Automatic gain control device and method, and radio communication apparatus having the automatic gain control function
US6577852B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 5, 2000 |
| Grant date | Jun 10, 2003 |
| Priority date | — |
| Expiry date | Aug 27, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/3052
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
When an input signal S11 is variable-gain-amplified by a variable gain amplifier 1 to obtain a predetermined output signal S12, a variable gain control signal S15 is generated by a detecting circuit 2, an A/D converter 3, an adder 4, and a converting unit 5. Both a latch circuit 6 and an adder 7 calculate a difference between a variable gain control signal generated during a preceding control operation and a present variable gain control signal. When the difference result is equal to “0”, a counter 8 counts predetermined stable condition continued time, and thereafter outputs a non-operation setting signal S16. Also, the counter 8 sends out the variable gain control signal generated during the preceding control operation to the variable gain amplifier 1 so as to set the detecting circuit 2, the A/D converter 3, the adder 4, and the converting unit 5 into non-operation conditions thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.