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EP0170793A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

High-frequency transmitter modulated by binary data signals

Assignee: Robert Bosch GmbH
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Filing: 1985-05-07
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Granted: —
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Expires: 2005-05-07
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Abstract

Abstract Translated from German Es wird ein durch binäre Datensignale modulierbarer Hochfrequenzsender vorgeschlagen, der sich durch eine hohe Langzeit-Frequenzkonstanz auszeichnet. Der Hochfrequenzsender enthält einen in der Frequenz umtastbaren spannungsgesteuerten Oszillator (18), dessen Ausgangsfrequenzen (fH, fL) einer Mischschaltung (53) einer Zusatzschaltung (30) zugeführt werden, so daß in der Mischschaltung durch Mischung mit einer der Mittenfrequenz (f0) des spannungsgesteuerten Oszillators entsprechenden Hilfsfrequenz (fa) die durch die Umtastung entstehende Hubfrequenz (Δf) erhalten wird. Durch eine digitale Meßschaltung (62) werden die Periodendauern der Hubfrequenz gemessen. Abweichungen von einem Soll-Wert werden mittels eines Digital/Analog-Wandlers (81) und anschließender Integration in Korrekturspannungen umgewandelt, die den Steuerspannungen (UH, UL) für die Frequenzumtastung des Oszillators (18) hinzugefügt werden. A high-frequency transmitter which can be modulated by binary data signals and which is distinguished by a high long-term frequency constancy is proposed. The high-frequency transmitter contains a frequency-controlled voltage-controlled oscillator (18), the output frequencies (fH, fL) of which are fed to a mixing circuit (53) of an additional circuit (30), so that in the mixing circuit by mixing with one of the center frequencies (f0) of the voltage-controlled Auxiliary frequency (fa) corresponding to oscillator, the stroke frequency (Δf) resulting from the shift keying is obtained. The period of the stroke frequency is measured by a digital measuring circuit (62). Deviations from a target value are converted by means of a digital / analog converter (81) and subsequent integration into correction voltages, which are added to the control voltages (UH, UL) for frequency shift keying of the oscillator (18).

Inventors

  • 👤 Heribert Dipl.-Ing. Gorzel

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-06 01:42
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/10; H04L27/16; H04L27/12

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