MAX1471ATJ+T

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RF Receivers

MAX1471ATJ+T is a highly integrated single-chip radio receiver with applications in a variety of markets, including aircraft, handheld radio, navigation systems, and personal communications devices. The chip is designed to provide complete RF signal reception, with low radio frequency noise, low current consumption, and high linearity all in a small footprint. In addition, it is also designed to provide digital demodulation and interface with digital baseband components.

Principle of Operation

The MAX1471ATJ+T receiver is based on a combination of direct conversion radio frequency (RF) super-heterodyne techniques. The direct signal path is used to receive signals from a transmission source within the required frequency range. The super-heterodyne portion of the design involves the use of a programmable RF down conversion stage. This stage converts the received RF signal to an intermediate frequency signal of 65MHz, which is subsequently filtered and amplified before being routed to a quadrature demodulator. The demodulator operates at baseband frequencies and provides the necessary components for demodulating and regenerating the transmitted signal.

The demodulator consists of four individual stages. First, the demodulator uses a frequency mixer to convert the baseband signal back to an intermediate frequency. This intermediate frequency is then amplified and filtered before being sent to a phase locked loop (PLL) for further signal conditioning. The PLL filter is used to reject unwanted signals and noise, while at the same time providing a linear response within the passband. The resulting signal is then sent to a low-noise amplifier and ultimately to the baseband output port.

External Components

In addition to the integrated chip, the MAX1471ATJ+T receiver requires a range of external components to provide optimal performance. These components include a low-noise amplifier (LNA) and a band-pass filter. The LNA is used to provide increased sensitivity to received signals and ensure that the signal is amplified with minimal noise. The band-pass filter is used to ensure that only signals within the specified frequency range are accepted by the receiver. Other components needed to complete the system include an antenna tuner, a voltage controlled oscillator, a synthesizer, and an RF synthesizer.

Advantages and Applications

The MAX1471ATJ+T receiver offers several advantages when compared to existing receiver systems. These include a compact footprint, low power consumption, and high linearity. Additionally, the integrated design eliminates the need for external components, resulting in a cost-effective solution. As a result, the receiver is suited for a wide range of applications, including aircraft, handheld radio, navigation systems, and personal communications.

The MAX1471ATJ+T receiver is an ideal choice for applications that require high levels of RF sensitivity, wide bandwidths, low power consumption, and low radio frequency noise. Its compact design makes it suitable for use in cellular phones, portable audio devices, and other hand-held devices. Additionally, the receiver is suitable for use in automotive, industrial, and medical applications that require RF reception.

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