ACVS: Difference between revisions

From TekWiki
Jump to navigation Jump to search
(Created page with "Tektronix 11000-series plug-ins contain a subsystem called the Analog Control Voltage System (ACVS). The ACVS produces several independently controllable DC voltages. The volt...")
 
No edit summary
Line 7: Line 7:


The ACVS comprises three parts:
The ACVS comprises three parts:
* a [[AD667]] 12-bit DAC (single output)
* [[Media:AD667.pdf|AD667]] 12-bit DAC (single output)
* [[CD4051]] analog switches and holding capacitors, implementing a set of sample and hold circuits
* [[Media:Cd4051b-q1.pdf|CD4051]] analog switches and holding capacitors, implementing a set of sample and hold circuits
* [[TL074]] opamps, providing a set of unity-gain output buffers
* [[Media:Tl074.pdf|TL074]] JFET-input opamps, providing a set of unity-gain output buffers
 
The output from the DAC is sampled and held, and the buffered voltages are fed to the rest of the plug-in.
The voltages in the sample and hold are periodically refreshed.


The ACVS is controlled by the [[M382]] chip, which also implements [[SDI]] and sequences the amplifier output enable signals.
The ACVS is controlled by the [[M382]] chip, which also implements [[SDI]] and sequences the amplifier output enable signals.

Revision as of 16:22, 26 April 2018

Tektronix 11000-series plug-ins contain a subsystem called the Analog Control Voltage System (ACVS). The ACVS produces several independently controllable DC voltages. The voltages are fed to the analog signal path circuitry (e.g., the OFFSET input of the M377, or the OFFSET pin on the TekProbe input connector. The number of voltages produced by the ACVS depends on how many channels the plug-in has. The 11A34, which has four channels, has an ACVS that produces sixteen control voltages.

The ACVS comprises three parts:

  • AD667 12-bit DAC (single output)
  • CD4051 analog switches and holding capacitors, implementing a set of sample and hold circuits
  • TL074 JFET-input opamps, providing a set of unity-gain output buffers

The output from the DAC is sampled and held, and the buffered voltages are fed to the rest of the plug-in. The voltages in the sample and hold are periodically refreshed.

The ACVS is controlled by the M382 chip, which also implements SDI and sequences the amplifier output enable signals.