发明名称 |
Low power regulated ampliflier in a transponder |
摘要 |
<p>The invention relates to a transponder (1) comprising an antenna (4), a demodulator (5) and a signal processing circuit (6) which converts a modulated signal received via the antenna (4) into a signal suitable for processing in the demodulator (5). The signal processing circuit (6) comprises an amplifier (7) with a predefined amplification factor and a closed loop control circuit (8) serving to maintain the voltage swing of the processed signal applied at the input of the demodulator (5) substantially constant. In a preferred embodiment the closed loop control circuit comprises a capacitor which is continually discharged and differingly charged as a function of the strength of the output signal of the amplifier of the signal processing circuit, the voltage resulting across the capacitor controlling a controllable resistor connected in parallel to the input of the signal processing circuit, and forming with a coupling capacitor a voltage divider.</p> |
申请公布号 |
EP2280480(A1) |
申请公布日期 |
2011.02.02 |
申请号 |
EP20100012660 |
申请日期 |
2003.06.25 |
申请人 |
TEXAS INSTRUMENTS DEUTSCHLAND GMBH |
发明人 |
OBERHUBER, RALPH;STEINHAGEN, WOLFGANG;PREXL, FRANZ |
分类号 |
G06K19/07;H03G3/20;H03G3/30;H03G1/00;H04B1/59 |
主分类号 |
G06K19/07 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|