Title:
パルスカウントＦＭ復調器を具える受信機、及びパルスカウントＦＭ復調器
Document Type and Number:
Japanese Patent JPH09511633
Kind Code:
A
Abstract:
A receiver having, arranged in this order, an input section, an FM demodulator, to which a frequency-modulated input signal is applied, and an LF section, which FM demodulator includes a pulse shaper and a low-pass filter, the pulse shaper comprising a series arrangement of at least a load and a capacitance, the base-emitter junction of a transistor being arranged across the capacitance, and further including a switching device for charging and discharging the capacitance. The pulse shaper generates a low-noise pulse in that charging of a capacitance is started upon an edge of the input signal. The capacitance voltage is measured by a single transistor and when the transistor is turned on, the charging current of the capacitance is diverted via the transistor, so that the capacitance voltage is limited. The capacitance is discharged upon a second edge, after which the cycle is repeated. The output signal of the pulse shaper is a signal which varies with the current through the capacitance.
Inventors:
センペル アドリアヌス
ファン ニーウヴェンブルフ ヨハネス
ファン ニーウヴェンブルフ ヨハネス
Application Number:
JP52620095A
Publication Date:
November 18, 1997
Filing Date:
March 20, 1995
Export Citation:
Assignee:
フィリップス エレクトロニクス ネムローゼ フェンノートシャップ
International Classes:
H03D3/00; H03D3/04; H03K9/06; (IPC1-7): H03D3/00
Attorney, Agent or Firm:
杉村 暁秀 （外６名）