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Amplifier IC enables clear AM/FM car-radio reception

Posted: 14 Jun 2007     Print Version  Bookmark and Share

Keywords:antenna amplifiers  AM/FM transmission  reception loss 

Atmel Corp. has announced the availability of the highly integrated ATR4251's impedance-matching amplifier that helps compensate for signal losses resulting from the smaller dimensions of modern antennas and the longer cables to the car radio. The antenna amplifier IC enables AM/FM car-radio reception when used with designer antennas, including windshield, roof or bumper antennas.

The chip enables crystal-clear reception without distortion, even under the difficult and rapidly fluctuating field-strength conditions typically found in moving antenna systems, due to its highly dynamic AM and FM range. This high-reception quality is due to the balance of an AM gain value of up to 35dB, a large-signal behaviour both in AM and FM mode (IP3 148dB?V in FM), and a good noise behaviour in antenna applications.

A separate LNA for FM and a buffer amplifier for AM are used to address the different operating frequencies and requirements of both AM and FM. The AM amplifier covers the entire broadcasting-frequency range of 150kHz up to 30MHz, which includes modern digital rights management systems. The FM LNA handles the frequency range of 70-166MHz.

The AM and FM AGC enables independent adjustment to prevent overdriving of amplifiers under large-signal conditions. In addition, the use of two separate AGC circuits stops strong AM signals from blocking FM stations, and vice versa.

Pricing for the ATR4251 starts at Rs.24.52 ($0.60) each in 100,000-piece quantities.

- Emily Gleason

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