STA5620 RF/IF and RFID

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RF Receivers

STA5620 is a high-performance single-chip UHF receiver specifically designed for digital TV and radio applications. It integrates all the functions of the receiver into a single chip to reduce the component count and thus reducing the cost. The chip has a very low power consumption of only 125 mW @RF, making it suitable for battery operated portable devices, and is also capable of working in high temperature environments of up to 125 °C.

STA5620 consists of a low noise amplifier, mixer, image rejecting filters, IF amplifier, integrated tuner, and demodulator. The low noise amplifier helps to increase the sensitivity of the receiver in order to improve the signal-to-noise ratio. The mixer helps to reduce the image frequency component of the signal while keeping the sideband intact. The image rejecting filters helps to further improve the signal-to-noise ratio by rejecting the image frequency components. The IF amplifier amplifies the IF signals and then the integrated tuner helps to select the desired channel from the received signals. Finally, the demodulator demodulates the signal and passes it to the output.

The STA5620 is designed to meet the standards of digital audio and video broadcasting systems such as DVB-T, ATSC, and ISDB-T and can be used in a wide range of applications such as handheld TV sets, DVD recorders, satellite receivers, and cable decoders. The chip offers an adjustable gain control and features programmable functions including channel selection, channel scan, and signal synchronization functions. It also supports various modulation formats including QAM and VSB for digital TV systems and DAB for radio systems, allowing it to be used in diversified applications.

The STA5620 also offers an RF input power detector which is used to measure the input power of the received signal and then to adjust the gain accordingly so that the received signal is always within the designed range. This helps to improve the system\'s performance and reliability, and also ensures that only the desired signals are being received. In addition, the chip supports various data interfaces such as Serial and parallel, and can also be used in multi-chip applications such as DAB receivers.

In conclusion, the STA5620 is a high-performance single-chip UHF receiver designed specifically for digital TV and radio applications. It integrates all the functions of the receiver into a single chip to reduce the component count and thus reducing the cost. The chip has a very low power consumption of only 125 mW @RF, making it suitable for battery operated portable devices, and is also capable of working in high temperature environments of up to 125 °C. It offers adjustable gain, programmable functions, and supports various modulation formats making it suitable for diversified applications. It also has an RF input power detector which helps to improve the performance and reliability of the system.

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