Keysight (Agilent) 8765B Product Overview

Features and description

• High isolation

• Exceptional reliability, long life
(5 million cycles)

• Excellent repeatability (± .03 dB)

• Unterminated

The Agilent Technologies 8765 family
of switches is designed for microwave
instrumentation and ATE systems
and features excellent electrical and
mechanical performance.

The 8765A and 8765B are equipped
with SMA connectors and operate
from dc to 4 and 20 GHz respectively.
The higher performance 8765C and
D switches operate from dc to 26.5
GHz with 3.5 mm connectors, and
40 GHz with 2.4 mm connectors.

For applications that call for 2.92 mm
connectors, Option 292 can be ordered
with the 8765D. All the switches are
available with voltage options cover­ing any drive voltage between 4.5 volts
and 32 volts dc. Where performance
data is required, Option UK6 includes
a print out of test results.

This family of switches was designed
from the ground up for maximum
dependability and performance. The
switches are all designed to operate
within their specifications for more
than 10,000,000 cycles. In precision
measurement and monitoring applica­tions where insertion loss repeatability
is critical, all the 8765s will operate
in excess of 5,000,000 cycles with
better than 0.03 dB of insertion loss
repeatability at 25 °C.

Driving the Agilent 8765A/B/C/D

The 8765 switch family is available
with two methods for connecting to
the dc control circuitry. The standard
switch comes with a ribbon cable ter­minated with a single in-line five
position male connector with one pin
removed. The user has the option of
ordering solder terminals (Option 3xx)
where they are required (Figure 3).
The 8765 Switches have both sides of
the switching solenoids available to
the user. Typically, as is the case with
the 8762 switches, the switching sole­noids will have a common positive
terminal or a common ground. By
making both sides of each coil avail­able, users can select the dc drive
method that best suits their needs.
The suggested methods are:

1. Common negative drive

2. Common positive drive

3. Polarity reversal drive

Regardless of which method is chosen
for switching, two conditions will
always apply:

• the switch is positive latching, and

• since there are no dc current
interrupts, the supply may be con­tinuous or may be switched off
after the 15 ms switching time.

Agilent 8765A/B/C/D

Microwave SPDT Switches
DC to 4, 20, 26.5 and 40 GHz

Product Overview

Common negative drive

With the common negative drive
method, the two outside pins on the
ribbon cable or the two outside termi­nals on the solder block are connected
together to form a common negative
or ground. Switching is then accom­plished by applying the appropriate
positive voltage to either of the inner
pins or terminals (figure la).

Common positive drive

To drive the switch with a common
positive arrangement, the two inner
pins or terminals are tied together
and then to a positive voltage. To
effect switching, one of the two outer
pins or terminals is brought to
ground (figure la).

Polarity reversal drive

To drive the switch using a polarity
reversal scheme, the two inner pins
or terminals are tied together. The
switch will complete a circuit
between the two RF contacts on the
side of the switch to which the nega­tive or ground potential has been con­nected (figure 1a).

Interfacing the Agilent 8765

The 8765 family of switches is a
vailable with two dc control connec­tion options. The standard switch is
connected to the dc drive circuitry
via a ribbon cable. Option 3xx allows
soldering wires between the control
circuitry and the switch.

Ribbon cable

The kapton flex circuit ribbon cable
on the standard switch is terminated
to a single in-line male polarized con­nector with four 0.64 mm (0.025 in.)
square pin posts on 2.54 mm (0.100 in.)
centers. Position number 2 has been
removed to facilitate polarization of
the plug and receptacle (figure 1a).
To assist you in connecting your drive
circuit to the switch's ribbon cable
connector, a six foot long four wire
cable is included with every standard
switch. The cable is terminated on
one end with a 0.64 mm (0.025 in.)
square pin receptacle. The five posi­tion receptacle is polarized to mate
with the switch’s ribbon cable con­nector. The opposite end of the cable
is left unterminated for connecting to
your control circuits.

Figure 1a. DC control circuit configurations

2

Figure 1b. Suggested receptacle dimen­sions