Low impedance gate drive to the 2N3970 analog switch for both on and off drive conditions is provided by this commutator. By producing a low ac impedance for off drive and high ac impedance for on drive to the 2N3970, this commutator circuit can close enough to the ideal gate drive conditions for high frequency signal handling. We use LH0005 as a megahertz signals amplifier.

Here’s the circuit diagram:

[Source: National Semiconductor Application Note]

This is circuit of  DTL-TTL controlled buffered analog Switch. Due to its low lowleakage and 25ohm rOn, this circuit uses 2N4860 JFET. As a voltage buffer, this circuit uses LM 102. Here is the circuit :

A dual trace oscilloscope chopper can adapt this circuit. Adequate  switch drive controlled DTL-TTL logic levels are generated by the DM7800 monolithic I.C. [Source: National Semiconductor Application Note]