This is a simple circuit of voltage controlled variable gain amplifier. This circuit uses 2N4391 that will provide a low Rds(on) less than 30 Ohm. This is the figure of the circuit.
This circuit is a simplest form. This circuit also uses three attenuators, that it will provide optimum dynamic linear range for attenuation. We can obtain the attenuation greater than 100dB at 10MHz by providing proper RF construction techniques.
This circuit is a simplest form. This circuit also uses three attenuators, that it will provide optimum dynamic linear range for attenuation. We can obtain the attenuation greater than 100dB at 10MHz by providing proper RF construction techniques.
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