4701: Difference between revisions
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The '''Tektronix 4701''' is a multiplexer [[introduced in 1971]] that allows several signals to be displayed on a single oscilloscope | The '''Tektronix 4701''' is a multiplexer [[introduced in 1971]] that allows several signals to be displayed on a single oscilloscope | ||
or captured with a recording instrument. | or captured with a recording instrument. | ||
the inputs. | The 4701 contains logic for round-robin switching between the inputs. | ||
The signal path bandwidth is DC to 1 MHz. | |||
Each of the eight inputs to the Tek 4701 is differential. | |||
Each differential input signal goes into a discrete amplifier using a [[151-1036-00]] dual n-channel JFET. | |||
The output of the discrete amplifier is fed to another differential amplifier, this one using a [[CA3030]] opamp. | |||
This second stage converts the differential signal to single-ended and provides a low output impedance. | |||
The low-impedance single-ended signal is fed to a diode switch. | |||
There is a summing junction where the outputs of the diode switches meet, thus forming the multiplexer. | |||
An output amplifier buffers the voltage on the summing junction, | |||
producing the low-impedance output for the rear panel connector. | |||
{{MissingSpecs}} | {{MissingSpecs}} |
Revision as of 06:48, 9 May 2020
The Tektronix 4701 is a multiplexer introduced in 1971 that allows several signals to be displayed on a single oscilloscope or captured with a recording instrument. The 4701 contains logic for round-robin switching between the inputs. The signal path bandwidth is DC to 1 MHz.
Each of the eight inputs to the Tek 4701 is differential. Each differential input signal goes into a discrete amplifier using a 151-1036-00 dual n-channel JFET. The output of the discrete amplifier is fed to another differential amplifier, this one using a CA3030 opamp. This second stage converts the differential signal to single-ended and provides a low output impedance. The low-impedance single-ended signal is fed to a diode switch. There is a summing junction where the outputs of the diode switches meet, thus forming the multiplexer. An output amplifier buffers the voltage on the summing junction, producing the low-impedance output for the rear panel connector.
Key Specifications
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