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7A16P: Difference between revisions
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==Internals== | ==Internals== | ||
The input stage of the 7A16P contains miniature relays switching between the two available input connectors and selecting the AC and DC coupling modes. Another relay is used to enter a shunt 50 Ω load if the corresponding input impedance is selected. Relays then select an optional 10x attenuator before entering the input buffer. This buffer contains an AC coupled MOSFET common drain amplifier and a DC coupled operational amplifier, creating a feed-beside scheme. Gain switching is accommodated by several junction FETs to enter another 10x attenuator in front of the MOSFET buffer, and to enter 2x and 5x low impedance attenuators after the input buffer. | The input stage of the 7A16P contains miniature relays switching between the two available input connectors and selecting the AC and DC coupling modes. Another relay is used to enter a shunt 50 Ω load if the corresponding input impedance is selected. Relays then select an optional 10x attenuator before entering the input buffer. This buffer contains an AC coupled MOSFET common drain amplifier and a DC coupled operational amplifier, creating a feed-beside scheme. Gain switching is accommodated by several junction FETs to enter another 10x attenuator in front of the MOSFET buffer, and to enter 2x and 5x low impedance attenuators after the input buffer. | ||
The digital circuitry is build around a [[MC6800]] processor with several MC6821 to drive the switches of the analog circuits and interfacing the modified 7000-series internal GPIB bus. | |||
==Links== | ==Links== | ||