公开(公告)号：US5625319A

公开(公告)日：1997-04-29

申请号：US550677

申请日：1995-10-31

申请人： Kazuya Miki

发明人： Kazuya Miki

IPC分类号： H04N5/455 ,  H03D3/02 ,  H03D3/24 ,  H03L7/093 ,  H04B1/10 ,  H04N7/20 ,  H03D3/00

CPC分类号： H03D3/24 ,  H03D3/241

摘要： An FM demodulator demodulating an FM modulated input signal through a PLL circuit, which includes a phase comparator a loop filter, a DC amplifier, a BB amplifier, and a VCO, and outputting the demodulated signal further includes a feedback circuit connected in parallel to DC amplifier and having a resistance which is a function of an external control voltage. The feedback circuit may be connected in parallel to both DC amplifier and BB amplifier. A PIN diode is typically used as a resistance variable element in the feedback circuit.

摘要翻译： 通过PLL电路解调FM调制输入信号的FM解调器，其包括相位比较器环路滤波器，DC放大器，BB放大器和VCO，并且输出解调信号还包括并联连接到DC的反馈电路 并且具有作为外部控制电压的函数的电阻。 反馈电路可以与DC放大器和BB放大器并联连接。 PIN二极管通常用作反馈电路中的电阻可变元件。