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Toshiba rolls VHF-TO-UHF dual-mode LNA

Posted: 31 Mar 2008     Print Version  Bookmark and Share

Keywords:PC capture boards  TV tuner 


Toshiba America Electronic Components Inc. has rolled a VHF-to-UHF dual-mode RF amplifier IC for use with portable systems with a built-in TV tuner, such as mobile phones, handheld game consoles, portable audio players, radios, portable DVD players, automotive TVs and TV antennas and PCs with a TV tuner or PC capture boards.

The Toshiba TA4029CTC low noise amplifier (LNA) supports two modes: a pass-through mode that allows strong signals to bypass the LNA to prevent the degradation of the received signal quality and LNA mode that amplifies weak signals to improve reception sensitivity. This dual mode helps widen the dynamic range of reception sensitivity.

Improved solution
Radio receiving conditions change continually on portables and automotive systems, so an LNA is typically used to obtain better images from very weak signals. However, this can cause the received signal to become too strong near a transmitting station, and as a result, the strong signals amplified by an LNA become distorted, degrading reception quality.

To address this issue, the TA4029CTC acts as a closed switch for a strong signal, passing the signal through without amplification. The device also includes LNA shutdown capability, which reduces power consumption by shutting down the LNA in pass-through mode.

The device supports mode switching with a logic IC, and can be directly driven by a demodulator IC. This IC accepts a wide supply voltage of 2.3-3.3V to match the supply voltage of the RF tuner and demodulator ICs. The supply current is also adjustable with an external resistor, independent of the power supply voltage.

TA4029CTC is packaged in a Toshiba's 6-pin CST package, a chip scale series developed to support the need for smaller and thinner packages in mobile handsets.

Samples of the Toshiba TA4029CTC VHF-to-UHF dual mode low noise amplifier are available now, priced at Rs.19.74 (50 cents) each in sample quantities.

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