The Tektronix 7603 is a general-purpose 100 MHz non-storage, large-screen scope that takes two 7000-series vertical plug-ins and one 7000-series horizontal plug-in. The Tektronix 7D20 is a two-channel digitizing plug-in for 7000-series scopes. It is a triple-width plug-in and provides both vertical and horizontal signals to the scope.

7D20 Dual Channel Programmable Digitizer uses an analog shift register (CCD) for high-speed signal acquisition, and then digitizes the stored analog signal at a lower speed. This design allowed the 7D20 to capture single-shot events at 40 MSamples/s even though this exceeded the speed of ADCs of the time. The 7D20 can digitally store waveforms and has a GPIB interface. A microprocessor (68B09) in the plug-in controls most of its functions.
The analog waveforms that are sent to the 7000-series mainframe are generated by vertical and horizontal DACs. The DACs outputs can be calibrated for scaling and shift so that signals are accurately displayed on the oscilloscope screen.

Specifications

• Bandwidth: 0–70 MHz (DC), 10 Hz–70 MHz (AC)
• Rise time: < 5 ns
• Sampling Rate: 40 MSps
• Resolution: 8 bit
• Deflection: 5 mV/Div to 5 V/Div (1–2–5)
• Input impedance: 1 MΩ 20 pF