Title:
閾値拡大FM復調器およびこれを具える受信機
Document Type and Number:
Japanese Patent JP3887016
Kind Code:
B2
Abstract:
An FM demodulator having two input terminals (11, 12), to which FM input signals having 90 DEG phase relation are applied, the said FM demodulator including a phase comparator (1) and a tunable, phase shifting circuit (2), the phase shifting circuit (2) being tuned by the FM demodulator output signal via a feedback path comprising a loop, filter. By adding a compensation filter (5) to the tuning control loop the phase shifting circuit is effectively cancelled from the tuning control loop, thereby making the tuning control loop independent of the bandwidth of the phase shifting circuit (2). Thus the bandwidth of the phase shifting circuit (2) can be reduced for threshold extension.
Inventors:
Casparco Fitz Wolf Dietrich Georg
Kokke Robert Frederiks Eduard
Kokke Robert Frederiks Eduard
Application Number:
JP51155796A
Publication Date:
February 28, 2007
Filing Date:
September 18, 1995
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
G01R19/165; H03D3/06; G06G7/12; H03D3/00; H03D3/22; H03G5/16
Attorney, Agent or Firm:
Kosaku Sugimura
Shiro Fujitani
Kiyoshi Kuruma
Yoshiyuki Iwasa
Shiro Fujitani
Kiyoshi Kuruma
Yoshiyuki Iwasa