8766K Datasheet, PDF (1/8 Pages) Agilent(Hewlett-Packard) – Agilent 8766/7/8/9K Microwave Single-Pole Multi-Throw Switches

Agilent 8766/7/8/9K
Microwave Single-Pole Multi-Throw
Switches
Product Overview
dc to 18, 26.5 GHz
Features and description
• Exceptional reliability, long life
(5,000,000 cycles minimum)
• Excellent repeatability
• Compact
• Easy GPIB implementation for ATE
applications
• Single-pole, multiple-throw models
available:
three-throw (8766K)
four-throw (8767K)
five-throw (8768K)
six-throw (8769K)
This Agilent Technologies family of single-
pole, multiple-throw switches utilizes the
same proven technology as the well known
Agilent 849X family of step attenuators.
These products offer the same rugged reli-
ability, excellent repeatability (typically 0.01
dB to 18 GHz and 0.05 dB to 26.5 GHz),
long life (greater than 5 million switching
cycles), compactness, and broadband
performance as the 849X family. Each
product consists of 2 to 5 solenoid driven
switching sections connected in series.
The solenoid armatures are held in place
with permanent magnets able to withstand
shocks over 10 g’s.
The sections switch within 20 millisec-
onds, including contact settling time,
which is of importance for automatic
test applications. The switches include
self-interrupting contacts which minimize
power consumption and simplify the driver
circuit design (figure 1). Each model is
available with a wide range of solenoid
voltage choices (24 volts, standard, or
optionally 5 or 15 volts) to match your
product or system’s requirements.
Section switching
Figure 1 shows one switching section
schematic. Each section utilizes one
solenoid with dual coil windings, one coil
to switch in the RF connector, and one coil
to switch in the thru line.
With a positive voltage applied to the
common pin, the state (RF connector
or thru line) of a particular section is
determined by connecting its RF connector
pin or thru pin to a negative voltage or
ground. Tables 1 through 4 define the pin
assignments for the different switches.
As a section is switched, the internal
contacts of the activated coil open, thus
shutting off current flow. At the same
time, the internal contacts for the other
coil close so that it can be activated when
desired. Figure 1 shows a section that has
been switched to the RF connector posi-
tion (note the closed thru line coil contact).
The switching is “break-before-make”
type, thus a momentary interruption of the
RF signal occurs at switching.
Although all sections can be switched
simultaneously, the attenuator drive
must not allow both pins of the same
section (e.g., section 1, pins 5 and 6) to
be activated concurrently, or else that
section would cycle rapidly. All terminals
are “floating,” so bipolar or unipolar power
supplies may be used.