vhf rf preamp 100 175 mhz with max2633

Posted on Feb 7, 2014

This is the diagram of VHF RF Preamp circuit 100-175 MHz with single chip MAX2633. The circuit can be used for the entire VHF broadcast and PMR band (100-175 MHz) which can be easily construct without any special test equipment. The grounded-gate configuration is inherently stable without any neutralization if appropriate PCB layout techniques are

vhf rf preamp 100 175 mhz with max2633
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employed. The performance of the amplifier is quite good. The noise figure is below 2 dB and the gain is over 13 dB. The low noise figure and good gain will help car radios or home stereo receivers pick up the lower-power local or campus radio stations, or distant amateur VHF stations in the 2-metres band. Due to the so-called threshold effect, FM receivers loose signals abruptly so if your favourite station fades in and out as you drive, this RF amplifier can cause a dramatic improvement. MAX2633 are low-voltage, low-noise amplifiers for use from VHF to microwave frequencies. Operating from a single +2. 7V to +5. 5V power supply voltage, these devices have a flat gain response to 900MHz. Their low noise figure and low supply current make them ideal for receive, buffer, and transmit IF applications. MAX2633 feature a shutdown pin that allows them to be powered down to less than 1 A supply current.

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