公开(公告)号：EP0645882A1

公开(公告)日：1995-03-29

申请号：EP94306136.6

申请日：1994-08-19

Applicant: SGS-Thomson Microelectronics Limited

Inventor： Horsfall, Wayne Leslie ,  Shipton, Gary

IPC: H03D3/24

CPC classification number: H03D3/244

Abstract: A method of demodulating an FM carrier wave and a demodulating circuit are described which utilise a gain control circuit. An output is supplied from the gain control circuit to a phase locked loop circuit tuned to a selected carrier wave frequency. A first output of the phase locked loop circuit is used to generate a tuned gain control signal dependent on the amplitude of the input FM carrier wave to which the phase locked loop is tuned and the tuned gain control signal is used to control the gain of the gain control circuit.

Abstract translation: 描述了一种利用增益控制电路解调FM载波和解调电路的方法。 输出从增益控制电路提供给调谐到所选择的载波频率的锁相环电路。 锁相环电路的第一输出用于产生调谐增益控制信号，该调谐增益控制信号取决于调谐锁相环的输入FM载波的振幅，调谐增益控制信号用于控制 增益控制电路。

公开(公告)号：EP0645881A1

公开(公告)日：1995-03-29

申请号：EP94306135.8

申请日：1994-08-19

Applicant: SGS-Thomson Microelectronics Limited

Inventor： Horsfall, Wayne Leslie ,  Shipton, Gary

IPC: H03D3/24

CPC classification number: H03D3/244

Abstract: A method of demodulating an FM carrier wave and an FM demodulation circuit are described which use a phase locked loop. The phase locked loop is tuned to a selected carrier wave frequency including the step of selecting a setting of the variable gain circuit in the phase locked loop to select a desired loop gain.

Abstract translation: 描述了使用锁相环解调FM载波和FM解调电路的方法。 锁相环被调谐到选定的载波频率，包括在锁相环中选择可变增益电路的设置以选择期望的环路增益的步骤。

公开(公告)号：EP0645891A1

公开(公告)日：1995-03-29

申请号：EP94306134.1

申请日：1994-08-19

Applicant: SGS-Thomson Microelectronics Limited

Inventor： Horsfall, Wayne Leslie ,  Shipton, Gary

IPC: H03L7/113 ,  H03D3/24

CPC classification number: H03L7/113 ,  H03D3/244

Abstract: Apparatus for setting up the tuning frequency of a phase locked loop is provided which utilises the voltage controlled oscillator of the phase locked loop itself. The apparatus includes signal translation circuitry which can provide a control voltage to the VCO of the phase locked loop dependent on a tuning voltage which is alterable in response to the frequency of the signal output by the VCO.

Abstract translation: 提供了用于设置锁相环的调谐频率的装置，其利用锁相环本身的压控振荡器。 该装置包括信号转换电路，其可以根据可响应于VCO输出的信号的频率而改变的调谐电压向VCO的VCO提供控制电压。