Input circuit for an HF-transmitting component

Details Input circuit for an HF-transmitting component Input circuit for an HF-transmitting component

2005-04-26

2005-04-26

Pascal, Robert (Department: 2817)

Modulators

Frequency modulator

Plural modulation

C455S119000

Reexamination Certificate

active

06885256

ABSTRACT:
An input circuit for an HF-transmitting component1of a battery-operated device for the transmission of a data signal aims to reduce the power consumption. For that purpose the fundamental frequency of a reference oscillator5is modulated with the digital data signal, the data rate being greater than 20 kchip/s. For smoothing of the modulated reference signal an amplitude limiter11and a band pass filter15are connected between the reference oscillator5and the HF-transmitting component1.

REFERENCES:
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patent: 5646701 (1997-07-01), Duckworth et al.
patent: 5758265 (1998-05-01), Okanobu
patent: 5940457 (1999-08-01), Dreifuss et al.
patent: 20040108916 (2004-06-01), Kwong et al.
Infineon Technologies, “Wireless Components”, ASK/FSK Transmitter 868/433 MHz; TDA 5100 Version 2.1, Specification Jun. 2001.

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