Showing posts with label rf. Show all posts
Showing posts with label rf. Show all posts
Monday, April 8, 2013
5 Watts FM RF Amplifier
This
fm rf amplifier uses 2SC1971 transistor to provide 5 watts of output.
Output matching is adjusted via the two 40pF trimmer capacitors
likewise also to the input. Note that the emitter of this transistor is
directly grounded on the heat sink and should have a good thermal
transfer. Driving power of 100 to 200mW can be applied in order to
provide 5watts of output. Use a dummy load to tune this amplifier and
remember that the transistor is biased in Class C, sufficient
filtering should be followed after the output to minimize all the
harmonics. Use ground plane construction technique in the PCB lay-out
for best result, the more the grounding the better. If you have hard
time finding the 10uH rf choke, try to wind 1/2 meter of 0.2mm enamel
wire over a 33K 1/2 watt resistor and solder the coil ends to the legs
of the resistor.
fm rf amplifier uses 2SC1971 transistor to provide 5 watts of output.
Output matching is adjusted via the two 40pF trimmer capacitors
likewise also to the input. Note that the emitter of this transistor is
directly grounded on the heat sink and should have a good thermal
transfer. Driving power of 100 to 200mW can be applied in order to
provide 5watts of output. Use a dummy load to tune this amplifier and
remember that the transistor is biased in Class C, sufficient
filtering should be followed after the output to minimize all the
harmonics. Use ground plane construction technique in the PCB lay-out
for best result, the more the grounding the better. If you have hard
time finding the 10uH rf choke, try to wind 1/2 meter of 0.2mm enamel
wire over a 33K 1/2 watt resistor and solder the coil ends to the legs
of the resistor.
Monday, April 1, 2013
RF power amplifier IC
RF power amplifier IC is a type of electronic amplifier used to convert low-power radio frequency signal into a larger signal strength is important, usually for driving a transmitting antenna. This is usually optimized for high-efficiency, high output power (P1dB) of compression, loss of income on the input and output, better benefits, and optimal heat dissipation.
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| RF power amplifier IC |
To make our amplifiers can also use transistors or IC OP Amp. In the op amp is actually a transistor that is in the form of a series so its easier to use.
Suppose that is used in the amplifier IC Op Amp 741 is a monolithic high performance electronic components that use Fairchild epitacial process. IC Op Amp 741 is an IC in which packed a differential circuit. The data sheet of IC Op Amp 741.
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